Programming thread

Croco · Jun 29, 2025

analrapist said:
He spells things wrong intentionally because he prefers the appearance of certain words. He is quite, quite weird.

He is native Chinese but learned English by reading The Camel Book.

For Personal Computing math, audio, and visual exercise, a practical approach may be: Reaper with API python scripting and GNUplot for math visualizations. I think tech as a means in and for itself, especially if it doesn't pay, being a huge time sink in the context of so, so many other pressing very complex issues (fixing a broken lawnmower today for example) arise constantly in everyday life, then low level vulkan and programming epic demoscenes might be a little too much extra.

Belisarius Cawl · Jul 1, 2025

y a t s said:
We've come so far since the C64 demo scene days, but what do we have to show for it?
>learning graphics? fuck that, just use JS and maybe bundle it with a whole-ass web browser.

Things like this are very useful:

https://python-visualization.github.io/folium/latest/

N Space · Jul 1, 2025

Am I a dumb niggerfaggot or does matroska misbehave when it comes to metadata and thumbnail handling? It makes me want to pull my hairs out when I output an encode to it using ffmpeg.

Belisarius Cawl · Jul 2, 2025

N Space said:
Am I a dumb niggerfaggot or does matroska misbehave when it comes to metadata and thumbnail handling? It makes me want to pull my hairs out when I output an encode to it using ffmpeg.

Can't tell without error messages

Croco said:
For Personal Computing math, audio, and visual exercise, a practical approach may be: Reaper with API python scripting and GNUplot for math visualizations.

SageMath has a high-level plotting interface based on matplotlib (which on its own can be a bit primitive and a pain to use):

https://doc.sagemath.org/html/en/tutorial/tour_plotting.html

BAD JOKE · Jul 2, 2025

Jotch said:
Rust is the language that powers the Kiwi Farms, which is basically Nazi Germany if you think about it.

Well, yes, but, unfortunately, writing rust saves lives of journalists, so I'd rather have everything written in C++

Lard Shart · Jul 2, 2025

BAD JOKE said:
cue journalists getting killed because the dev of your secure chat app won't write rust because "it's woke"

>Implying Rust is the only memory safe language
Xhey are so narrow-sighted it's insane.

Outer Space Traveller · Jul 2, 2025

Lard Shart said:
>Implying Rust is the only memory safe language
Xhey are so narrow-sighted it's insane.

LoL, are they trying to sell Rust as a "secure" language? I mean, it's a programming fucking language, not an application. Do troons ever get tired of lying?
(I don't have much expertise, if anyone wants to correct me, feel free to add any info).

Creative Username · Jul 2, 2025

Lard Shart said:
>Implying Rust is the only memory safe language
Xhey are so narrow-sighted it's insane.

for a high-level application like a chat app, a good first choice would be a memory safe garbage-collected applications language such as java (but not necessarily java in particular)
system programming languages like rust or c are just overkill unless you really need them, and even then you should probably just use them for a couple things and ffi into them from your chosen high-level language

Outer Space Traveller said:
LoL, are they trying to sell Rust as a "secure" language? I mean, it's a programming fucking language, not an application. Do troons ever get tired of lying?
(I don't have much expertise, if anyone wants to correct me, feel free to add any info).

the troons are actually right here (rust actually does make it basically impossible to make a large class of errors) but everything else about rust is so cancerous that even a lot of security-minded c programmers avoid touching it
(and the troons are somehow among the least cancerous things about rust, believe it or not. it sucks that bad)

Anti Snigger · Jul 2, 2025

BAD JOKE said:
Well, yes, but, unfortunately, writing rust saves lives of journalists, so I'd rather have everything written in C++

View attachment 7588039

I don't think "journalists will die if you don't use rust" is motivating in the way this retard intended it

N Space · Jul 3, 2025

Belisarius Cawl said:
Can't tell without error messages

There's no error per se but I can share the console output. The important stream here is #4 (input), #1 (output) which is a thumbnail. The input .mp4 file embeds it just fine but when muxing it to a matroska container, the thumbnail is copied but not set as a thumbnail even though the flag -disposition:v:1 attached_pic was typed. ffmpeg is initially fooled into thinking it has been set as a thumbnail but a later glance with ffprobe and the fact I can't see it in File Explorer says otherwise. I guess matroska treats image files as a single frame video and thus can't display them as thumbnails because it claims to have a framerate of 30k fps.

Code:

ffmpeg -i test.mp4 -map v -map a -c copy -disposition:v:1 attached_pic out.mkv
ffmpeg version N-116234-gd4c1ad1f5c-g1a86a7a48d+2 Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 14.1.0 (Rev3, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --extra-cxxflags=-fpermissive --extra-cflags=-Wno-int-conversion --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libharfbuzz --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-chromaprint --enable-decklink --enable-frei0r --enable-libaribb24 --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfribidi --enable-libgme --enable-libilbc --enable-libsvthevc --enable-libkvazaar --enable-libmodplug --enable-librist --enable-librtmp --enable-librubberband --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi --enable-openal --enable-libcodec2 --enable-ladspa --enable-libglslang --enable-vulkan --enable-libdavs2 --enable-libxavs2 --enable-libuavs3d --enable-libplacebo --enable-libjxl --enable-opencl --enable-opengl --enable-libopenh264 --enable-openssl --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree --extra-cflags=-DAL_LIBTYPE_STATIC --extra-cflags='-IC:/ffmpeg/local64/include' --extra-cflags='-IC:/ffmpeg/local64/include/AL'
  libavutil      59. 28.100 / 59. 28.100
  libavcodec     61. 10.100 / 61. 10.100
  libavformat    61.  5.101 / 61.  5.101
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
  libpostproc    58.  2.100 / 58.  2.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000016578780d00] stream 0, timescale not set
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    title           : COURAGE THE COWARDLY DOG SEASON 1 DISC 1
    encoder         : Lavf61.5.101
  Duration: 00:01:14.58, start: 0.000000, bitrate: 6170 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 74.124000
      Metadata:
        title           : Chapter 02
  Stream #0:0[0x1](eng): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, smpte170m/smpte170m/bt709), 1456x1080 [SAR 270:271 DAR 364:271], 5958 kb/s, 23.98 fps, 23.98 tbr, 16k tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](eng): Subtitle: dvd_subtitle (dvdsub) (mp4s / 0x7334706D), 720x480, 3 kb/s (default)
      Metadata:
        handler_name    : SubtitleHandler
  Stream #0:3[0x5](eng): Data: bin_data (text / 0x74786574), 0 kb/s
      Metadata:
        handler_name    : SubtitleHandler
  Stream #0:4[0x0]: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1080x1328 [SAR 1:1 DAR 135:166], 90k tbr, 90k tbn (attached pic)
File 'out.mkv' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:4 -> #0:1 (copy)
  Stream #0:1 -> #0:2 (copy)
Output #0, matroska, to 'out.mkv':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    title           : COURAGE THE COWARDLY DOG SEASON 1 DISC 1
    encoder         : Lavf61.5.101
  Chapters:
    Chapter #0:0: start 0.000000, end 74.124000
      Metadata:
        title           : Chapter 02
  Stream #0:0(eng): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, smpte170m/smpte170m/bt709), 1456x1080 [SAR 270:271 DAR 364:271], q=2-31, 5958 kb/s, 23.98 fps, 23.98 tbr, 1k tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #0:1: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj420p(pc, bt470bg/unknown/unknown), 1080x1328 [SAR 1:1 DAR 135:166], q=2-31, 90k tbr, 1k tbn (attached pic)
  Stream #0:2(eng): Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp, 192 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
Press [q] to stop, [?] for help
[out#0/matroska @ 00000165787863c0] video:54323KiB audio:1748KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.073289%
size=   56112KiB time=N/A bitrate=N/A speed=N/A

Code:

ffprobe out.mkv
ffprobe version N-116234-gd4c1ad1f5c-g1a86a7a48d+2 Copyright (c) 2007-2024 the FFmpeg developers
  built with gcc 14.1.0 (Rev3, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --extra-cxxflags=-fpermissive --extra-cflags=-Wno-int-conversion --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libharfbuzz --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-chromaprint --enable-decklink --enable-frei0r --enable-libaribb24 --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfribidi --enable-libgme --enable-libilbc --enable-libsvthevc --enable-libkvazaar --enable-libmodplug --enable-librist --enable-librtmp --enable-librubberband --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi --enable-openal --enable-libcodec2 --enable-ladspa --enable-libglslang --enable-vulkan --enable-libdavs2 --enable-libxavs2 --enable-libuavs3d --enable-libplacebo --enable-libjxl --enable-opencl --enable-opengl --enable-libopenh264 --enable-openssl --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree --extra-cflags=-DAL_LIBTYPE_STATIC --extra-cflags='-IC:/ffmpeg/local64/include' --extra-cflags='-IC:/ffmpeg/local64/include/AL'
  libavutil      59. 28.100 / 59. 28.100
  libavcodec     61. 10.100 / 61. 10.100
  libavformat    61.  5.101 / 61.  5.101
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
  libpostproc    58.  2.100 / 58.  2.100
Input #0, matroska,webm, from 'out.mkv':
  Metadata:
    title           : COURAGE THE COWARDLY DOG SEASON 1 DISC 1
    COMPATIBLE_BRANDS: isomiso2mp41
    MAJOR_BRAND     : isom
    MINOR_VERSION   : 512
    ENCODER         : Lavf61.5.101
  Duration: 00:01:14.58, start: 0.000000, bitrate: 6163 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 74.124000
      Metadata:
        title           : Chapter 02
  Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv, smpte170m/smpte170m/bt709), 1456x1080 [SAR 270:271 DAR 364:271], 23.98 fps, 23.98 tbr, 1k tbn (default)
      Metadata:
        HANDLER_NAME    : VideoHandler
        VENDOR_ID       : [0][0][0][0]
        DURATION        : 00:01:14.575000000
  Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1080x1328 [SAR 1:1 DAR 135:166], 30k fps, 1k tbr, 1k tbn
      Metadata:
        DURATION        : 00:00:00.000000000
  Stream #0:2(eng): Audio: aac (LC), 48000 Hz, stereo, fltp (default)
      Metadata:
        HANDLER_NAME    : SoundHandler
        VENDOR_ID       : [0][0][0][0]
        DURATION        : 00:01:14.560000000

On another note, matroska doesn't record the bitrate of each stream when it's encoded so if you try to measure and save it as a tag, you end up with misleading metadata.

Belisarius Cawl · Jul 3, 2025

N Space said:
There's no error per se but I can share the console output.

Any chance I could get access to the original media?

N Space · Jul 3, 2025

Belisarius Cawl said:
Any chance I could get access to the original media?

The file itself is just a sample I made to test a python script I'm writing hence the thumbnail mismatch with the content. P.S., I'll delete this after some hours because it's 54 MB.

Belisarius Cawl · Jul 3, 2025

N Space said:
The file itself is just a sample I made to test a python script I'm writing hence the thumbnail mismatch with the content. P.S., I'll delete this after some hours because it's 54 MB.

I'm trying a few things but just to make things the same, which file manager are you using to view thumbnails?

Also here is the first lead I am working with: https://video.stackexchange.com/questions/35598/is-it-possible-to-embed-a-thumbnail-in-a-mkv-file

N Space · Jul 3, 2025

Belisarius Cawl said:
I'm trying a few things but just to make things the same, which file manager are you using to view thumbnails?

Also here is the first lead I am working with: https://video.stackexchange.com/questions/35598/is-it-possible-to-embed-a-thumbnail-in-a-mkv-file

Just the standard Windows File Explorer.

Edit: Yeah that's the answer, thanks a lot!

Croco · Jul 5, 2025

Does anyone use Emacs and ledger-mode for personal accounting? The other option is GNU Cash. I'd really like to automate a script to pull from my bank accounts/credit cards and have this data available to me in plain text, with less manual grunt work. In the old days we'd have to sit down every month with a calculator and learn to balance the checkbook. This might be more important than making spinning triangles and sine waves.

y a t s · Jul 5, 2025

Croco said:
I'd really like to automate a script to pull from my bank accounts/credit cards and have this data available to me in plain text, with less manual grunt work.

Are there APIs for this sort of thing? Like the dinosaur I am, I just use spreadsheets and manual entry.

mentally retarded user · Jul 6, 2025

>Not using rust for your "secure chat app" so journalists and pedophiles using it get killed.

Creative Username · Jul 7, 2025

>using java/python/go/ruby/whatever (all memory safe languages) for your secure chat app so the rust trannies kill themselves and get laughed at, even by the journo menace (you somehow saved them without using their shitty meme language)

y a t s · Jul 7, 2025

Creative Username said:
cancerous things about rust

Its nature is right in the branding, clear as day:

Cancer_bellianus_Johnston_1861_stuffed_museum_La_Rochelle.webp

Literally Cancer.

Belisarius Cawl · Jul 8, 2025

N Space said:
Just the standard Windows File Explorer.

Edit: Yeah that's the answer, thanks a lot!

Good for you, I had no luck with Dolphin

Programming thread

Croco

Heh, heh...

Belisarius Cawl

N Space

Non-measurable sets are abstract nonsense

Belisarius Cawl

BAD JOKE

Lard Shart

I just wanna graze

Outer Space Traveller

Towards a brighter future.

Creative Username

Complain. Xeet. Prison. Enjoy. (Pat-Life)

Anti Snigger

h̸͋̉̈́́̐́͑̇̅̄͛́̀̿̏̅̅̀̆̎͛̆̀̑̈́͊̐̈́͒̔͒͛̍͑̉͂̏̅̈̔̒̕̚͘̕͘͘̚

N Space

Non-measurable sets are abstract nonsense

Belisarius Cawl

N Space

Non-measurable sets are abstract nonsense

Belisarius Cawl

N Space

Non-measurable sets are abstract nonsense

Croco

Heh, heh...

y a t s

MATI scientist

mentally retarded user

Creative Username

Complain. Xeet. Prison. Enjoy. (Pat-Life)

y a t s

MATI scientist

Belisarius Cawl