Hacker Public Radio

Hacker Public Radio

Hacker Public Radio is an podcast that releases shows every weekday Monday through Friday. Our shows are produced by the community (you) and can be on any topic that are of interest to hackers and hobbyists.

Episodes

  1. 11h ago

    HPR4659: Command Line Fun - Recording a show

    This show has been flagged as Clean by the host. In this episode Kevie does a step-by-step approach to record an episode of HPR using the FFMPEG tool on the Linux command line. Before beginning please ensure that FFMPEG is installed, it is available in the vast majority of Linux repositories. Start by making a new folder to keep all your files in and move into the new folder (these will be numerous by the end of your recording): mkdir Podcast cd Podcast To start recording audio use the command: ffmpeg -f pulse -i default file01.flac and finish the recording by pressing ctrl+c. I would recommend recording a test piece of audio to ensure that you are recording from your desired microphone and that the levels are to your liking. To listen to the audio file we use ffplay: ffplay file01.flac Once all of the files have been recorded, to reduce the need for editing I would recommend recording several short segments, we need to put these together using: ffmpeg -i file01.flac -i file02.flac -i file03.flac -i file04.flac -i file05.flac -filter_complex "[0:a][1:a][2:a][3:a][4:a]concat=n=5:v=0:a=1" filedone.flac Not that the number of sets squared brackets [] should be the same as the number of files (these start at zero) and the number after n= should be the actual number of files you wish to combine. To remove any extended periods of silence then we can use: ffmpeg -i filedone.flac -af silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-45dB filefinished.flac Please note that this is a bit flaky at the time of recording (my results have been mixed) and it will re-encode the audio file so never do this with a lossy file such as ogg or mp3 as this will reduce the quality, keep this for lossless versions such as flac or wav files. If you want to spend a bit more time editing the files and getting a better final audio file then the most effective way (but not quick) is to trim the audio from the end and beginning. Listen to the audio files and note the times of any periods of silence. As these normally are at the beginning and end, especially when we are recording in short segments then I will limit the instructions to avoid these becoming silly in length. Firstly clip off the end silences first, if you start with the beginning then it will change the starting position of the end silences. To remove audio from the end of a track use: ffmpeg -i file01.flac -vn -acodec copy -to 00:01:30 file01cut.flac In this example anything after 1 minute and 30 seconds will be removed. The edited audio file will then be saved as file01cut.flac. This method does not re-encode the audio so there is no loss of quality. To remove audio from the start of a track use: ffmpeg -ss 30 -i file01.flac -c copy file01cut.flac In the above example the first 30 seconds of the file will be removed and saved as file01cut.flac Once you have edited each audio file then they will need to be merged together again to make a complete show. Provide feedback on this episode.

  2. 1d ago

    HPR4658: Audio Revisited

    This show has been flagged as Clean by the host. 01 Introduction This is a follow up to my 4 part series on simple podcasting. In this episode I will discuss a number of experiments with audio filtering. These experiments were inspired by comments by listeners and by other discussions about audio on HPR. I am not an audio expert, so I am doing this partly in order to learn something, but mainly in order to have a bit of fun. I hope that you find this entertaining as well. In a comment on the first episode a listener mentioned something called Solocast and said that the method bore a resemblance to the method that I was using. Here is his comment -------------------- 02 Comment #3 posted on 2026-04-03 07:49:58 by Reto It reminds me about Solocast Hi Whiskeyjack, I really liked your podcast and the topic. I cannot remember about your last, but the sound quality of this one was good on my mobile speakers :) The concept reminded me about the program from Norrist (another host on HPR), while similar does it have some differences HPR 3496 https://hackerpublicradio.org/eps.php?id=3496 As I am not on the future feed, I look forward to your next episode. Cheers, Reto -------------------- 03 End of comment. I did not recall having heard the episode on Solocast, but this sounded very interesting. Solocast was in HPR episode 3496 and was released by norrist on the 27th of December 2021. I listened to that episode and does indeed use use the same basic concept of recording short segments of audio and combining them later instead of creating one big recording and editing it with an audio editor. 04 The main difference is that the work flow that I described involves a lot of manual steps, while Solocast is a short Python program that automates the entire process of presenting your script, recording the segments, combining the segments, and filtering and normalizing the result. I won't try to describe Solocast in detail, instead I would recommend just listening to HPR episode 3496 to get norrist's explanation directly. -------------------- 05 While I wanted to make sure that I credited norrist with having come up with this concept four years before I did, this won't be the focus of this episode. Instead I will talk about audio filtering and various experiments that I ran on several different methods. 06 While looking at the source code for Solocast I noticed that it used a filtering method that resembled one used by Jivetalk, a podcast production program that caught the attention of one of the HPR community news presenters. This method involves taking a sample of quiet audio where there is no speaking taking place, and then using this as input to a noise reduction filter which is applied to the voice recording. The filter subtracts the quiet sample from the voice audio, which should theoretically remove the ambient noise. 07 I decided to apply this method to a number of different audio test recordings which were recorded under different circumstances using different hardware. In this way I could see if the method worked equally well under all circumstances or if there were some sorts of noise which it was suited to and some sorts that were not. 08 While I was at it, I also picked several other filter methods to see how they worked as well. Potentially, some methods may be better under some conditions while other methods were better suited to others. -------------------- 09 I won't present all of my experiments, as that would be a bit dull to listen to. Instead I will describe each method and then present audio samples which illustrate my conclusions. There are two pieces of audio software involved, both of which were also used in my series on simple podcasting. 10 The first is Sox, spelled s o x , and which is short for Sound Exchange. Sox is a command line program for audio manipulation. Sox is Free Software, released under the GPLv2 or later. The other is FFMPEG, which is also a command line program. FFMPEG is also Free Software, released under the LGPL V 2.1 or later, and GPL v 2 or later. Sox actually uses FFMPEG for certain operations. -------------------- 11 Audio Hardware For recording hardware I used the following. 12 Maxwell Headset The first is a cheap Maxwell headset that has an electrical noise problem. Unfortunately I don't have a model number for this headset. I described this hardware, the noise problems that I had with it, and how I created filters to deal with the noise in my series on simple podcasting. Briefly though, this is a headset that has a build in microphone on a boom which allows the microphone to be positioned close to the mouth. It connects with a USB cable. 13 Borne Earpiece and In-line Microphone This is a set of earplugs that go in your ears and connected by wires and a very small microphone built into a small bulge in the cable. It connects using a 3.5mm jack. The model number seems to be BUD250-BL. 14 XTrike Headset This is a gaming headset similar to the Maxwell headset described above. The model number is GH-510 It uses a USB connection. 15 Yanmai Condenser Microphone This is a microphone that comes with a small tripod stand. The model number is SF-910 It uses a 3.5mm audio jack. -------------------- 16 This is not a review of the hardware. Rather, I was trying to create audio problems so that I could test ways to fix them. Therefore, do not take the above list as a recommendation of what to buy. However, you can see that I am not using any expensive audio hardware. If you want to make an HPR podcast, you do not need professional level hardware. -------------------- 17 Audio Samples The audio samples are as follows 18 Quiet This was recorded in a quiet environment at my desk. This is my normal podcasting environment and represents optimal conditions. The main reason for this method is to see how the various filter methods perform when dealing with the electrical noise from the Maxwell headset. 19 Small fan This is a small USB powered table fan approximately 10 cm in diameter. It was located roughly 40 cm or less to the left of the microphone, although this varies depending on the microphone. 20 Traffic This was along a busy street with traffic noise in the background. -------------------- 21 Filter Methods Sox noisered Filter with Audio Profile This method uses the Sox noisered filter. Here is a brief quote from the Sox documentation on this filter. Quote Reduce noise in the audio signal by profiling and filtering. This effect is moderately effective at removing consistent background noise such as hiss or hum. To use it, first run SoX with the noiseprof effect on a section of audio that ideally would contain silence but in fact contains noise - such sections are typically found at the beginning or the end of a recording. End of quote For these tests I recorded a separate noise profile to go with each test. -------------------- 22 Basic Manual Filter This is a basic high and low pass filter pair based on the work I had done in my previous series on simple podcasting. However, based on the tests that I have done for this episode, I decided to get a bit more aggressive in terms of filtering. I use a high pass filter of 120 Hz, and low pass filter of 8 kHz. The each filter is then applied twice to increase its effect. I also added band reject filters to deal specifically with 50 and 60 Hz line noise. -------------------- 23 Complex Manual Filter This uses the manually constructed filter described in my series on simple podcasting. This uses the basic manual filter plus a series of custom bandreject filters to fix specific noise problems with the Maxwell headset. -------------------- 24 FFMPEG afftdn Filter The documentation describes this as "Denoise audio samples with FFT." -------------------- 25 FFMPEG arnndn Filter The documentation describes this as "Reduce noise from speech using Recurrent Neural Networks." -------------------- 26 FFMPEG agate Filter I will pronounce this as "agate" for convenience. The documentation describes this as "A gate is mainly used to reduce lower parts of a signal. This kind of signal processing reduces disturbing noise between useful signals." -------------------- 27 Method The experimental method used was to take each noise sample and apply the different filter methods to it. Where there are parameters which can be adjusted, a script was used to generate a series of different sample files with different parameter values. Not all possible parameters were experimented with, as the goal is to see which method produces what sorts of results under different circumstances, not to get the best possible result for the samples that I happen to have. The method in each case was as follows 28 Step 1 Convert the audio file to FLAC if it is not already in that format. 29 Step 2 Apply a basic high and low pass filter described previously to each sample. The reason for this basic filtering is that it eliminates at least some undesired noise in a fairly fool proof manner, leaving less for the more advanced filter to deal with. This should allow for a better test of the filter under realistic conditions. 30 Step 3 Apply the noise reduction filter being tested. 31 Step 4 Normalize the filtered sample to 17 LUFS accordi

  3. 2d ago

    HPR4657: UNIX Curio #8 - Comparing Files

    This show has been flagged as Clean by the host. This series is dedicated to exploring little-known—and occasionally useful—trinkets lurking in the dusty corners of UNIX-like operating systems. Most users of UNIX-like systems are probably familiar with the diff utility. It is widely used with source code to compare two files and see what the differences are between them. Non-programmers, like me, also use it to examine what has changed in different versions of scripts or configuration files. Quite a few pieces of newer software can compare different versions of data and express changes in a format either identical to or similar to diff output. However, there are two other long-standing tools for this purpose that are far less known and deserve in my view to be termed UNIX Curios. The first of these is cmp 1 . While diff is primarily intended to be used on text files and compares them line by line, cmp compares files byte by byte. In my experience, its main use is to see whether two binary files are in fact identical—if they are, cmp outputs nothing and returns an exit status of 0. Back when methods of transferring files were not as reliable as they are today, this was a tool I would reach for sometimes. For example, you could use it to confirm that the data on a CD-ROM you burned was the same as the original. If there is a difference between the files, cmp will return an exit status of 1. By default, it will also print the location (byte and line number) of the first differing byte. When used with the -l option, it will print the location and value of every byte that differs. There is one exception to these: if the files are the same except that one is shorter than the other, it will print a message to that effect. The exit status will still be 1 in that case. Using the -s option with cmp will cause it to be totally silent and output nothing. Only the exit status will indicate whether the files are the same, different, or if the exit status is greater than 1, that an error occurred. This makes it useful for scripting, for example in case you wanted to confirm that a file copied to another location arrived fully intact. It is worth noting that diff is also capable of comparing binary files—however, it is not required by POSIX to report what is actually different or where differences occur. The same exit status as in cmp is returned: 0 if the files are the same, 1 if they are different, or greater than 1 if an error occurred. While many implementations offer an option to suppress the output, this is not in the standard 2 so the most portable method would be to instead redirect output to /dev/null . On my system the diff utility is three times the size of cmp , so if you don't need its extra capabilities, it is a less efficient way of doing the job. The other UNIX Curio for today is comm , and this utility 3 is also intended to compare two files to see what is common between them. Ken Fallon briefly talked about it a few years ago in HPR episode 3889 . Compared to the others, it has a much more specific use case. The two files are expected to be text files that are already sorted. What comm will do is print a tab-separated list of all the lines appearing in either or both files. Lines only in the first file will appear in the first column, lines only in the second file will be in the second column, and lines in both files will be in the third column. Any combination of the options -1 , -2 , and -3 can be used with comm to suppress printing of the first, second, or third column respectively. Using all three options at the same time is supported but it results in no output, so that isn't very useful. Unlike the other utilities, the exit status of comm doesn't tell you anything about the two files. It will be 0 if the program ran successfully, and greater than 0 if it didn't. I'm not sure if I have ever actually used comm for anything practical. I find its default output a bit difficult to meaningfully interpret, plus you need to ensure the two files are already sorted. It seems to be best suited to comparing lists, and one use case that Ken Fallon mentioned would be comparing two lists of files to see if any are missing. The command comm -3 listA listB would print files that only appear in listA in the first column and those only in listB in the second column. This would let you ignore all the filenames that appear in both and focus on those that were absent from one or the other. If on the other hand you only wanted to see the filenames that are on both lists, comm -12 listA listB would give you that. Some more frivolous potential uses also come to mind. If for some reason the cat utility is broken on your system, you could use comm listA /dev/null to print the file listA instead. If you want to insert tab characters before every line of a file but have an aversion to using sed or awk , then comm /dev/null listA would output listA with one tab before each line, and comm listA listA would insert two tabs. A bit silly, but it would work. The GNU implementation of comm even lets you choose something other than a tab to separate the columns 4 , so you could go wild with that. According to the POSIX specifications for cmp and comm , one of the two filenames given as arguments, but not both, can be a " - ", in which case standard input will be used for that "file" in the comparison. Also, the results are undefined if both arguments are the same FIFO special, character special, or block special file. Some implementations might not have these limitations, but you shouldn't rely on that everywhere. All three of these were developed quite early. The cmp utility appeared in 1971's First Edition UNIX 5 , while comm and diff seem to have made their debut in Fourth Edition UNIX 6,7 from 1973. The original versions might not have behaved exactly like their modern counterparts, and newer implementations (especially of the diff utility) have acquired additional options and capabilities, but the basic operation of each has stayed the same. The next time you need to compare files against each other, consider whether cmp or comm might be appropriate before automatically reaching for diff . They all have their uses in different situations. References: Cmp specification https://pubs.opengroup.org/onlinepubs/009695399/utilities/cmp.html Diff specification https://pubs.opengroup.org/onlinepubs/009695399/utilities/diff.html Comm specification https://pubs.opengroup.org/onlinepubs/009695399/utilities/comm.html GNU coreutils manual: comm https://www.gnu.org/software/coreutils/manual/html_node/comm-invocation.html First Edition UNIX cmp manual page http://man.cat-v.org/unix-1st/1/cmp Fourth Edition UNIX comm manual page https://www.tuhs.org/cgi-bin/utree.pl?file=V4/usr/man/man1/comm.1 Fourth Edition UNIX diff source https://www.tuhs.org/cgi-bin/utree.pl?file=V4/usr/source/s1/diff1.c Provide feedback on this episode.

  4. 3d ago

    HPR4656: My review of musicozy sleep/exercise bluetooth headband

    This show has been flagged as Clean by the host. Sound quality, ease of use, comfort, battery life, price https://themusicozy.com/products/headband/index.htmlProvide feedback on this episode.

  5. 6d ago

    HPR4655: Tips for Glasses

    This show has been flagged as Clean by the host. HPR and Glasses HPR community members are nerds We know from movies that nerds wear glasses We can conclude that HPR community members wear glasses Cleaning Background I have very oily skin and am constantly smudging my glasses All lenses wipes are too small. I accidentally touch the lenses with my fingers when I am trying to clean them And smudge them up again I heard an eye doctor say, the best way to clean glasses is with dish soap and dry with a microfiber cloth I tried this method It is a great solution because you wash glasses and fingers tips at the same time Cleaning Method Hand soap is OK to use on glasses. get the soap on you fingertips Then hold your glasses one of the lenses Use your thumb and finger tips to clean the glasses the soap removes the excess oil from your fingertips no smudges when you dry with the microfiber cloth Progressives With regular progressives the top of the lenses is for distance vision and the bottom of the lenses is for up close vision There is a zone in the middle for medium distance, but it is very narrow Using a computer at work I kept having to move my head up and down to find the best position for working. Computer Glasses have more space for intermediate distances From https://iotlenses.com/blog/eight-types-of-progressive-lenses.html Computer progressive lenses, also known as occupational designs or enhanced readers, are optimized for intermediate and near vision, making them ideal for tasks like prolonged computer work or activities at mid-range distance Provide feedback on this episode.

  6. Jun 4

    HPR4654: What's in my component Box?

    This show has been flagged as Explicit by the host. Background This episode describes the contents of an old fishing tackle box I got as a birthday present very many years ago. I used it over the years to gather a pile of mostly useless electronic components and junk. I came across it recently when we were doing a clear out. Mrs X wanted to throw it out. I had a lot of sentimental value due to the long time I’ve had it. I am a bit of a hoarder and it took a bit of persuasion on my part to be able to keep it especially since I could not think of a single use for any of the contents! I’ve not had time to add links against all the items. Hopefully I’ve managed to add links to most of the more unusual items. Apologies if I’ve missed any. Contents of Box Top row left to right, back to front Compartment 1 Stereo Jack plug & socket Double pole double throw (2-way) switch 12V dc relay from RS 3 legged semiconductor (voltage regulator?) Compartment 2 Multiple fuses mostly for cars Compartment 3 Small silica jelly pouch Micro Switch Reed switches (Not reed relays as I call them in my show) Compartment 4 Potentiometers, Rheostat, variable resistors https://en.wikipedia.org/wiki/Potentiometer Control knobs Compartment 5 Large selection of miniature panel mounted toggle switches https://en.wikipedia.org/wiki/Switch#Toggle_switch Compartment 6 Two crocodile clips https://en.wikipedia.org/wiki/Crocodile_clip Half of a Hi Fi speaker plug https://en.wikipedia.org/wiki/File:Speaker_din_male_and_female.jpg Washer Compartment 7 Mostly chocolate block connectors https://en.wikipedia.org/wiki/File:Leuchterklemme_75dpi.jpg Small selection of glass cartridge Fuses Single 13 Amp mains fuse for UK plug Assortment of soldering iron tips Crocodile clip Air adapter for foot pump for blowing up an air bed or similar Spare nozzle for a de-soldering tool. Made from PTFE https://en.wikipedia.org/wiki/Desoldering#/media/File:Vacuum_plunge.jpg https://en.wikipedia.org/wiki/Polytetrafluoroethylene Ferrite ring https://en.wikipedia.org/wiki/Ferrite_bead Compartment 8 Rubber Grommets and a heatsink Middle row left to right, back to front Compartment 1 Large selection of glass cartridge fuses Compartment 2 Another large selection of glass cartridge fuses Small selection of diodes, some quite Large https://en.wikipedia.org/wiki/Diode Compartment 3 Two multi turn precision variable resistors https://en.wikipedia.org/wiki/Potentiometer#/media/File:Beckman_Helipot_potentiometer_SA1400A_2007.075.002.jpg Cheap variable resistor with in built switch Compartment 4 Bag of multi coloured LED’s (Cheap for Pi add on board) 2 inch 8 ohm speaker Compartment 5 Panel mounted heavy duty toggle switch, two pole one way Compartment 6 Light Dependent Resistor (LDR) https://en.wikipedia.org/wiki/Photoresistor Large Tricolour LED Compartment 7 Variable capacitors PCB (Printed Circuit board) mounted Spare nozzle for de-soldering tool. Made from PTFE Light Dependent Resistor (LDR) Panel mounted heavy duty rotary switch, two pole one way Bag of various fuses Halogen 12V car headlight bulb Variable resistor with long plastic spindle, panel mount Heatsink possibly for heavy duty transistor Compartment 8 Variable resistor PCB (Printed circuit board) mounted Bottom row This is just a big jumble of stuff, listed in no particular order DC red and black power lead with inbuilt fuse Small solder-less breadboard for prototyping https://en.wikipedia.org/wiki/Breadboard Bag of various plugs & connectors mostly Jack plugs and sockets Bag of quartz crystals and a components receipt from 1985 I added crystals to an old PMR (Private mobile radio) boot mount radio. Possible a Pye Westminster Radio. I looked but couldn’t find picture of the radio Several bits of Perfboard or strip board https://en.wikipedia.org/wiki/Perfboard 1 Watt audio amplifier kit with instructions not built! D-type serial port mounted to PCB with screw down connections Bag of resistors https://en.wikipedia.org/wiki/Resistor Large bag of LED panel mount holders Electronic Instruction guide XH79L (Maplin) price 25p Chocolate block connecting block https://en.wikipedia.org/wiki/File:Leuchterklemme_75dpi.jpg Telephone pickup for recording phone calls. (Never worked) https://www.amazon.co.uk/Black-Telephone-Pickup-Sensitive-Microphone/dp/B000L1OZG8 Multi coloured ribbon cable Plastic trimming tool screwdriver set. https://www.amazon.co.uk/C-K-T4857-Precision-Plastic-Trimmer/dp/B000WKIYTW Panel mounted BNC socket (Baby Neill Constant) https://en.wikipedia.org/wiki/BNC_connector Provide feedback on this episode.

  7. Jun 3

    HPR4653: Starting the Habit of Reading

    This show has been flagged as Clean by the host. Openreads is a privacy oriented and open source cross-platform app written in Flutter available for Android and iOS for keeping track of your books. There are four lists provided so you won't get confused: books you finished, books you are currently reading, books you want to read later, books you didn't finish. You can use custom tags and filter through them. A book can be added by: looking it up in the Open Library database, scanning its barcode, adding its details manually. You can also view some cool statistics! Links: Battletech: Mercenary's Star by William H. Keith Permaculture for the Rest of Us by Jenni Blackmore Piranesi by Susanna Clarke Battletech: The Price of Glory by William H. Keith The Urban Homestead by Kelly Coyne Battletech: The Sword and the Dagger by Ardath Mayhar Battletch: Warrior En Garde by Michal A. Stackpole Sisterhood of Dune by Brian Herbert and Kevin J. Anderson Fundamentals of the Wudang Sword Method by Scott M. Rodell Battletech: Warrior Riposte by Michal A. Stackpole The Cardio Code by Kenneth Jay Mentats of Dune by Brian Herbert and Kevin J. Anderson How to Grow More Vegtables by John Jeavons Provide feedback on this episode.

  8. Jun 2

    HPR4652: simon says

    This show has been flagged as Clean by the host. From https://en.wikipedia.org/wiki/Simon_(game) Simon is an electronic game of short-term memory skill invented by Ralph H. Baer and Howard J. Morrison, working for toy design firm Marvin Glass and Associates, with software programming by Lenny Cope. The device creates a series of tones and lights and requires a user to repeat the sequence. If the user succeeds, the series becomes progressively longer and more complex. Once the user fails or the time limit runs out, the game is over. The original version was manufactured and distributed by Milton Bradley and later by Hasbro after it took over Milton Bradley. Much of the assembly language code was written by Charles Kapps, who taught computer science at Temple University and also wrote one of the first books on the theory of computer programming. Simon was launched in 1978 at Studio 54 in New York City and was an immediate success, becoming a pop culture symbol of the 1970s and 1980s Provide feedback on this episode.

  9. Jun 1

    HPR4651: HPR Community News for May 2026

    This show has been flagged as Explicit by the host. New hosts There were no new hosts this month. Last Month's Shows Id Day Date Title Host 4630 Fri 2026-05-01 Playing Civilization V, Part 11 Ahuka 4631 Mon 2026-05-04 HPR Community News for April 2026 HPR Volunteers 4632 Tue 2026-05-05 Hackerpublic Radio New Years Eve Show 2026 Episode 6 Honkeymagoo 4633 Wed 2026-05-06 Ham Radio Licence Lee 4634 Thu 2026-05-07 Upgrade Failsause operat0r 4635 Fri 2026-05-08 What did I do at work today? Part 3 Section 1 Lee 4636 Mon 2026-05-11 7 seconds memory Antoine 4637 Tue 2026-05-12 UNIX Curio #6 - at and batch Vance 4638 Wed 2026-05-13 Simple Podcasting - Episode 3 - Analyzing and Filtering Whiskeyjack 4639 Thu 2026-05-14 NLUUG Spring Conference 2026 Ken Fallon 4640 Fri 2026-05-15 Robert A. Heinlein Ahuka 4641 Mon 2026-05-18 Technical Dutch Open Source Event (T-DOSE) Ken Fallon 4642 Tue 2026-05-19 Hackerpublic Radio New Years Eve Show 2026 Episode 7 Honkeymagoo 4643 Wed 2026-05-20 HPR Beer Garden 13 - Triple IPA Kevie 4644 Thu 2026-05-21 Response to comments on HPR4424: Newsboat... Archer72 4645 Fri 2026-05-22 ZERO HOUR: FRIDAY AFTERNOON APK HACKING operat0r 4646 Mon 2026-05-25 Mobile Gaming Elsbeth 4647 Tue 2026-05-26 UNIX Curio #7 - Compression Vance 4648 Wed 2026-05-27 Simple Podcasting - Episode 4 - Audio Analysis Fun Whiskeyjack 4649 Thu 2026-05-28 What did I do at work today? Part 3 Section 2 Lee 4650 Fri 2026-05-29 Playing Civilization V, Part 12 Ahuka Comments this month Past shows hpr4424 (2025-07-17) "How I use Newsboat for Podcasts and Reddit" by Archer72. أحمد المحمودي said: "How did I find HPR" (2026-05-12 17:16:07) candycanearter07 said: "Re: How did I find HPR" (2026-05-12 19:36:04) hpr4502 (2025-11-04) "Cheap Yellow Display Project Part 3: Reverse beacon network " by Trey. Archer72 said: "Morse code" (2026-05-19 15:00:39) hpr4567 (2026-02-03) "Movie Recommendations for Hackers" by Deltaray. Antoine said: "Some watched!" (2026-05-27 03:33:12) hpr4587 (2026-03-03) "UNIX Curio #1 - Shell Archives" by Vance. Dave Morriss said: "Great reminder! I had forgotten shar" (2026-05-07 18:18:05) Vance said: "Color printing" (2026-05-08 22:02:23) hpr4607 (2026-03-31) "UNIX Curio #3 - basename and dirname" by Vance. Vance said: "Correction" (2026-05-12 01:03:12) hpr4618 (2026-04-15) "Simple Podcasting - Episode 2 - Basic Filtering" by Whiskeyjack. Henrik Hemrin said: "Generating sine wave" (2026-05-14 19:59:46) Whiskeyjack said: "Reply to Henrik Hemrin on Sine Waves in HPR4618" (2026-05-15 15:22:16) hpr4627 (2026-04-28) "UNIX Curio #5 - Faster, Pussycat! Kill! Kill!" by Vance. Steve Barnes said: "Thanks for the context!" (2026-05-21 05:28:05) hpr4628 (2026-04-29) "Nuclear Power Technology Follow Up" by Whiskeyjack. Antoine said: "o/" (2026-05-17 00:24:23) Whiskeyjack said: "Reply to Antoine on HPR4628" (2026-05-17 18:08:18) This month's shows hpr4631 (2026-05-04) "HPR Community News for April 2026" by HPR Volunteers. Whiskeyjack said: "Response to Ken Fallon in HPR4631 Community News" (2026-05-04 05:13:02) candycanearter07 said: "new episodes" (2026-05-04 18:47:39) Ken Fallon said: "new candycanearter07 episodes" (2026-05-05 09:00:00) أحمد المحمودي said: "Thanks for the encouragement" (2026-05-12 17:18:20) hpr4634 (2026-05-07) "Upgrade Failsause" by operat0r. YourName said: "Why is the audio so bad OMG sorry" (2026-05-06 20:05:43) Ken Fallon said: "Already reported and fixed" (2026-05-06 20:35:49) hpr4637 (2026-05-12) "UNIX Curio #6 - at and batch" by Vance. candycanearter07 said: "still useful!" (2026-05-13 03:43:37) norrist said: "at for scheduled reboots" (2026-05-16 19:41:04) Vance said: "Good points" (2026-05-17 03:03:47) Whiskeyjack said: "At and batch in HPR4637" (2026-05-17 18:35:11) hpr4640 (2026-05-15) "Robert A. Heinlein" by Ahuka. Antoine said: "Nice tips" (2026-05-17 00:22:01) Kevin O'Brien said: "I enjoyed doing it" (2026-05-17 19:14:19) hpr4646 (2026-05-25) "Mobile Gaming" by Elsbeth. candycanearter07 said: "my opinion of mobile gaming" (2026-05-27 00:24:58) hpr4647 (2026-05-26) "UNIX Curio #7 - Compression" by Vance. xmanmonk said: "Great Series" (2026-05-27 00:29:32) candycanearter07 said: "thoughts" (2026-05-27 13:20:13) Mailing List discussions Policy decisions surrounding HPR are taken by the community as a whole. This discussion takes place on the Mailing List which is open to all HPR listeners and contributors. The discussions are open and available on the HPR server under Mailman. The threaded discussions this month can be found here: https://lists.hackerpublicradio.com/pipermail/hpr/2026-May/thread.html Events Calendar With the kind permission of LWN.net we are linking to The LWN.net Community Calendar. Quoting the site: This is the LWN.net community event calendar, where we track events of interest to people using and developing Linux and free software. Clicking on individual events will take you to the appropriate web page. Provide feedback on this episode.

  10. May 29

    HPR4650: Playing Civilization V, Part 12

    This show has been flagged as Clean by the host. In our sample game we look at playing as Austria and aiming for a Diplomatic Victory. And our focus is on puppeting Citty-States, but be I misunderstood and instead of making a Diplomatic Victory easier, it makes it harder. I still managed to get my Diplomatic Victory, but a Science or Domination Victory would definitely have been easier in this scenario. Playing Civilization V, Part 12 A Diplomatic Victory Strategy Civilization V introduced a new Victory type and I thought it might be fun to try this strategy for a sample game to see broadly how this would work. I decided I would play as Austria on Prince level, which means that all players are equal and no one is favored. For my map I chose Fractal, Map Size = Standard, Game speed = Standard. My only Advanced Option was Quick Combat, because I didn’t need to see that drawn out, particularly since I plan to avoid combat as much as necessary. My leader is Maria Theresa, and her Austria has a unique ability called Diplomatic Marriage. This allows us to either Annex or Puppet any city-state that has been allied to us for 5 turns with the proper expenditure of Gold. My plan was to use this to Puppet the city-states to control their votes for the Diplomatic Victory, but that was a misunderstanding. I actually implemented one of the hardest ways to win a Diplomatic Victory. But that is what I did. Now to get them to ally with me the most effective way to do this is with cash and lots of it, and of course even more cash to actually effect to Puppeting of them. So my overriding objective in this game is to amass a large Treasury. But of course I cannot ignore my military either, since a weak military invites attacks form greedy neighbors. And I may need to “liberate” the occasional city-state if another player conquers them. Austria also has a Unique Unit, the Hussar, which replaces the Cavalry unit. It can move after attacking, has a flanking bonus, and has one extra movement. And the Unique Building is the Coffee House, which increases the generation of Great People in the city by 25%. So you can expect me to build these in every city as well. With that in mind, I started the game and settled in place, I had Mountains nearby, but also Sheep and Silver within my city, so some useful resources. I immediately started to produce a Scout as my first unit, and sent my Warrior out to explore. In the very early stage I focus on exploring the surrounding area and finding any Goody Huts, i.e. Ruins. My initial city site is not exactly ideal, as it is all hilly with Jungle nearby. After building my two Scouts, my next priority was to build a Worker unit to increase the productivity of my city. And for my first social policy I unlocked Tradition. When I got my second policy I picked Oligarchy, and plan to complete all of the Tradition tree. I cleared out a Barbarian encampment, and then discovered my first City-state, Vilnius. Then I needed to clear out another Barbarian encampment that was blocking me from finishing my exploration. Meanwhile I am focusing on getting techs for sailing the ocean blue, because that is how I plan to get trade routes, discover City-states I can puppet, and so on. Because money is key to my strategy I made a beeline for Currency in the my Science research. And while headed there I completed the Tradition tree. When I can get there I will work on the Commerce tree to maximize my cash, but until then the Patronage tree will let me improve my City-state relations, which is important for improving my relationships with City-states. After all, you need to be allies with them for 5 turns before you can puppet them. I now have three cities, and can probably squeeze out a few more, which should be sufficient to my needs. At Turn 141 I have 6 cities, which is all I will build in this game. I now have the technology to build Workshops, which are the first productivity boosters available, so I set all my cities to building them. For Research my immediate object was to get to Compass so I could build the Galleass, which would let me do more ocean exploration. But to go into deep Ocean I will need to go further to get Astronomy, which will let me build the Caravel which can enter deep ocean. Once I got that I switched to Banking, not just for the money, but as a prerequisite to building the Forbidden Palace, which grants two additional delegates in the World Congress/United Nations. When I get Banking I’ll go back to Astronomy, and then Navigation, to advance my seagoing capabilities. By Turn 216 I had gotten Banking and started on the Forbidden Palace. And by luck, just as I got started I got a Great Engineer. I am holding him in reserve in case I need to hurry production, since Great Engineers are the only way to do that in Civ 5. I also picked up Astronomy, which will let me build Caravels to explore the whole ocean. My next research priority will be Gunpowder since it is time to beef up my defenses. At Turn 240 my Caravels started to come out, and I found several new City-States. And since my Treasury is healthy (I started with 6,000 gold, and I’m bringing in 100 each turn), I began the process of puppeting the City-states. Puppeting City-states as Austria Let’s look at this in detail since it is important. The requirements are 2 things: Be allied with the City-state for 5 consecutive turns Have the cash needed. This amount is not too much early on, but it rises over time. So, how do you become allies with a City-state? There are a number of things you can do to improve your relationship. You can take on a quest that a City-state has published, which can be things like “Find another Natural Wonder” or “Create a Great Admiral”. These quests pop up continuously throughout the game, and you are free to ignore them, but fulfilling one will improve your relationship. Trade will also improve your relationship, so in this game all of my Trade routes were made with City-states. If you are in a position to have a successful war, you can find a former City-state that was conquered by one of the other Empires, liberate it, and then it will be your ally for the rest of the game. Giving them presents is how I usually do it, though. You can give them units or money. If your purpose is to get allies, money works best. But I do gift units in 2 circumstances. First, if I have obsolete units, giving them away might be better then deleting them. Second, if a City-state is under attack by another Empire. Gifting them units might help them hold out and make life difficult for a rival. The place where all of this is done is the City-state screen which opens up when you click on the bar above the City-state, which is where you handle all of your relationships. At the top of this screen you see your current status, which more often than not will be Neutral, which is how all City-state relationships start out. But you can get them angry by, for instance, moving a unit of your into their territory. If you only do it once, and give them time to get over it, they will go back to Neutral. You can also improve the relationship by pledging to protect them, but be careful. If they get attacked and you do not try to protect them, they will get very angry. Giving a gift opens a pop-up to say what kind of gift: 250 gold, 500 gold, 1000 gold, or a Unit. Note that a Unit is only worth 5 influence points, while 250 Gold is worth 20, so as I said Money is more powerful if your aim is to improve your status with them. So at Turn 242 I found the City-state of Singapore, and it appears that I was the first Empire to find them. So I immediately pledged to protect them. My Influence with them was 20, which is Neutral. We just met, and that is where things stand on first meeting. The be Friends you need to get to 30, and to be allies you need to get to 60. When I clicked Next Turn, I got a Quest from Singapore. They were worried about a Barbarian Encampment nearby, and if I cleared it out I would get additional influence with them. In this case, though, I let that go by. I want to move more quickly, and Singapore is across the Ocean from me. My influence with them at this point was 21, so only a modest increase. But I have 6038 Gold in my Treasury, and I am bringing in 102 per turn. So let’s see what a gift of 500 Gold will do. It brings me to 65 influence, so we are now Allies. But when I mouse-over Singapore, the pop-up window reminds me that my Influence will decrease by 1.12 per turn. For an Empire other than Austria this would mean a regular infusion of cash to keep up your status. And I have won Diplomatic victories with other Empires by saving up a lot of cash and dumping it on City-states just before the United Nations vote. But for Austria you have special ability called Diplomatic Marriage that lets you turn the City-state into a Puppet, and that is permanent. But it also presents some obstacles as we will see. We are allies now, but my influence will drop by 1 each turn, and I might lose my allyship before I can puppet them. But I can gift a unit and get another 5, and I happen to have a very obsolete Warrior unit that will serve the purpose. However, it takes three turns for the Unit to arrive, so I lose few more points. At Turn 247 I can now use the diplomatic Marriage option to make a puppet of Singapore. Prior to doing this I was fourth in score with 604, while the leader had 729. My Happiness Level was +25, and I now had 5833 Gold in my Treasury. Then I made Singapore a puppet, and now I am third in the game with a score of 664. My Treasury has fallen to 5258, which means it cost me 575 Gold. But most significant is that my Happiness fell from +25 to +9, which is a huge loss. I have enough gold to puppet 4-5 more City-states at this time but if I did I would have rebellions breaking out and my Empire would eventually collapse. This is the obstacle that Austria has to face. We

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About

Hacker Public Radio is an podcast that releases shows every weekday Monday through Friday. Our shows are produced by the community (you) and can be on any topic that are of interest to hackers and hobbyists.

Information

  • Creator
    Hacker Public Radio
  • Years Active
    2008 - 2026
  • Episodes
    10
  • Rating
    Explicit
  • Copyright
    © Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License
  • Show Website
    Hacker Public Radio

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