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• pgssubdec : fix subpicture output colorspace and range

  24 avril 2016, par Jan Ekström

  pgssubdec : fix subpicture output colorspace and range
  Functionality used before didn’t widen the values from limited to
  
  full range. Additionally, now the decoder uses BT.709 where it
  
  should be used according to the video resolution.
  Default for not yet set colorimetry is BT.709 due to most observed
  
  HDMV content being HD.
  BT.709 coefficients were gathered from the first two parts of BT.709
  
  to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2).
  
  They were additionally confirmed by manually calculating values.
  Fixes #4637
  

  • [DH] libavcodec/pgssubdec.c
  • [DH] libavutil/colorspace.h

• using for loop in powershell with ffmpeg to create thumbnails

  29 septembre 2020, par blue

  I have this basic for loop combined with ffmpeg that creates thumbnails for each video.

  


  Could anyone help me figure out why it doesn't work ? I don't really know much about powsershell.

  


  If i were to use a regular array it works but when i use a pre-sized array it does not.
EDIT :
somehow figured it out, i should have included the extention'.png' in the array instead of adding at the end of the for loop.i also didn't define a size for the array.

  


  $files = @(Get-ChildItem -Path 'D:\other stuff\ffmpeg test\*.mp4')
$filetext = @()
$test = 'd.png'

  
 for ($i=0; $i -lt $files.length; $i++){ 
 $filetext += (Get-Item $files[$i]).Basename + '.png'
 ffmpeg -i $files[$i] -ss 00:00:01  -vframes 1 $filetext[$i] 

}


  


  PS D:\other stuff\ffmpeg test> $files = @(Get-ChildItem -Path 'D:\other stuff\ffmpeg test\*.mp4')
$filetext = [Object[]]::new(100)


for ($i=0; $i -lt $files.length; $i++) {
  $filetext[$i] = % {$files[$i].BaseName}
  ffmpeg -i $files[$i] -ss 00:00:01  -vframes 1 $filetext[$i]'.png'
    
}

ffmpeg : ffmpeg version 2020-09-27-git-a3a6b56200-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
At line:7 char:3
+   ffmpeg -i $files[$i] -ss 00:00:01  -vframes 1 $filetext[$i]'.png'
+   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (ffmpeg version ...mpeg developers:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib 
--enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 
--enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm 
--enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt 
--enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libwavpack --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus 
--enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 59.100 / 56. 59.100
  libavcodec     58.108.100 / 58.108.100
  libavformat    58. 59.100 / 58. 59.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\other stuff\ffmpeg test\sample1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.25.101
  Duration: 00:00:30.87, start: 0.000000, bitrate: 
411 kb/s
    Stream #0:
0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 460x258 [SAR 1:1 DAR 230:129], 276 kb/s, 
29.97 fps, 
29.97 tbr, 
11988 tbn, 
59.94 tbc
 (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:
1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : 
SoundHandler
[NULL @ 000001c582d03700] 
Unable to find a suitable output format for 'sample1'
sample1: Invalid argument
ffmpeg : ffmpeg version 2020-09-27-git-a3a6b56200-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
At line:7 char:3
+   ffmpeg -i $files[$i] -ss 00:00:01  -vframes 1 $filetext[$i]'.png'
+   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (ffmpeg version ...mpeg developers:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib 
--enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 
--enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm 
--enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt 
--enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libwavpack --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus 
--enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 59.100 / 56. 59.100
  libavcodec     58.108.100 / 58.108.100
  libavformat    58. 59.100 / 58. 59.100
  libavdevice    58. 11.102 / 58. 11.102
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\other stuff\ffmpeg test\sample2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.25.101
  Duration: 
00:00:24.9
3
, start:
 
0.000000, bitrate: 789 kb/s
    Stream #0:
0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 460x460 [SAR 1:1 DAR 1:1], 658 kb/s, 30 fps, 30 tbr, 15360 tbn, 
60 tbc (default)
    Metadata:
      handler_name    : 
VideoHandler
    Stream #0:
1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[NULL @ 00000267c8bb0540] 
Unable to find a suitable output format for 'sample2'
sample2: Invalid argument


  


• Pydub The system can not find the file specified

  11 janvier 2021, par Madar

  So here is my code :

  


  from pydub import AudioSegment
sound1 = AudioSegment.from_mp3("sound_0.mp3")
sound2 = AudioSegment.from_mp3("sound_1.mp3")

sound = sound1 + sound2
sound.export("test.mp3",format="mp3")


  


  Problem :
I got the error message : WindowsError : [Error 2] The system can not find the file specified

  


  System configuration
Python version : 3.8
Pydub version : I just installed it
ffmpeg or avlib ? : ffmpeg
ffmpeg/avlib version : 2020-12-15-git-32586a42da-full_build-www.gyan.dev

  


  What did I try ?
So, I found some things to do on a Stackoverflow subject,
I tried to add this

  


  pydub.AudioSegment.ffmpeg = "way//to//ffmpeg.exe"


  


  But it doesn't worked, then this

  


  AudioSegment.converter = "way//to//ffmpeg.exe"


  


  Still doesn't work, so, because I'm on spyder with anaconda, I tried this on the anaconda prompt

  


  conda install -c conda-forge ffmpeg


  


  I even tried to put ffmpeg.exe,ffplay.exe in the current working directory but still doesn't worked..

  


  So I'm desperately here for some help, thanks in advance