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• ffmpeg error in subprocess.run but works in terminal

  6 juin 2023, par 8TM

  I'm creating my own MKV videos and I found a strange bug when I'm using subprocess module from python 3.11.2 to execute FFmpeg command.

  


  My FFmpeg command is running fine in terminal (ends with success) :

  


  ffmpeg -y \
-i input_video_stream.mkv \
-i input_audio_stream_1.ac3 \
-i input_audio_stream_2.ac3 \
-i input_audio_stream_3.ac3 \
-i input_audio_stream_4.ac3 \
-f srt -i input_subtitle_stream_1.srt \
-f srt -i input_subtitle_stream_2.srt \
-map 0 -map 1 -map 2 -map 3 -map 4 -map 5 -map 6 \
-c copy \
-metadata:s:a:0 language=eng -metadata:s:a:0 title="English1" \
-metadata:s:a:1 language=eng -metadata:s:a:1 title="English2" \
-metadata:s:a:2 language=eng -metadata:s:a:2 title="English3" \
-metadata:s:a:3 language=eng -metadata:s:a:3 title="English4" \
-metadata:s:s:0 language=eng -metadata:s:s:0 title="English1" -metadata:s:s:0 mimetype=application/x-ass \
-metadata:s:s:1 language=eng -metadata:s:s:1 title="English2" -metadata:s:s:1 mimetype=application/x-ass \
-disposition:a:0 default -disposition:s:s:0 default \
output_video_with_audio_and_subtitles.mkv


  


  But when I'm running it by in the same terminal (the same session and the same ffmpeg version) by python from subprocess.run(command) :

  


  subprocess.run([
    'ffmpeg', '-y',
    '-i', 'input_video_stream.mkv',
    '-i', 'input_audio_stream_1.ac3',
    '-i', 'input_audio_stream_2.ac3',
    '-i', 'input_audio_stream_3.ac3',
    '-i', 'input_audio_stream_4.ac3',
    '-f', 'srt', '-i', 'input_subtitle_stream_1.srt',
    '-f', 'srt', '-i', 'input_subtitle_stream_2.srt',
    '-map', '0', '-map', '1', '-map', '2', '-map', '3', '-map', '4', '-map', '5', '-map', '6',
    '-c', 'copy',
    '-metadata:s:a:0', 'language=eng', '-metadata:s:a:0', 'title="English1"', 
    '-metadata:s:a:1', 'language=eng', '-metadata:s:a:1', 'title="English2"', 
    '-metadata:s:a:2', 'language=eng', '-metadata:s:a:2', 'title="English3"', 
    '-metadata:s:a:3', 'language=eng', '-metadata:s:a:3', 'title="English4"', 
    '-metadata:s:s:0', 'language=eng', '-metadata:s:s:0', 'title="English1"', 
    '-metadata:s:s:0', 'mimetype=application/x-ass',
    '-metadata:s:s:1', 'language=eng', '-metadata:s:s:1', 'title="English2"', '-metadata:s:s:1', 'mimetype=application/x-ass', 
    '-disposition:a:0 default', '-disposition:s:s:0 default', 
    'output_video_with_audio_and_subtitles.mkv'
])



  


  it fails :

  


  
ffmpeg version 5.1.2-3 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration : —prefix=/usr —extra-version=3 —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —arch=amd64 —enable-gpl —disable-stripping —enable-gnutls —enable-ladspa —enable-libaom —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libcodec2 —enable-libdav1d —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libglslang —enable-libgme —enable-libgsm —enable-libjack —enable-libmp3lame —enable-libmysofa —enable-libopenjpeg —enable-libopenmpt —enable-libopus —enable-libpulse —enable-librabbitmq —enable-librist —enable-librubberband —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libsrt —enable-libssh —enable-libsvtav1 —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx265 —enable-libxml2 —enable-libxvid —enable-libzimg —enable-libzmq —enable-libzvbi —enable-lv2 —enable-omx —enable-openal —enable-opencl —enable-opengl —enable-sdl2 —disable-sndio —enable-libjxl —enable-pocketsphinx —enable-librsvg —enable-libmfx —enable-libdc1394 —enable-libdrm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libx264 —enable-libplacebo —enable-librav1e —enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, matroska,webm, from 'input_video_stream.mkv' :
  Metadata :
    ENCODER : Lavf59.27.100
  Duration : 00:44:19.94, start : 0.000000, bitrate : 22551 kb/s
  Stream #0:0 : Video : h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata :
      BPS : 22549589
      NUMBER_OF_FRAMES : 63631
      NUMBER_OF_BYTES : 7480665638
      _STATISTICS_WRITING_APP : mkvmerge v56.0.0 ('Strasbourg / St. Denis') 64-bit
      _STATISTICS_WRITING_DATE_UTC : 2023-05-15 08:21:43
      _STATISTICS_TAGS : BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      DURATION : 00:44:19.942000000
[ac3 @ 0x55b374ee9e80] Estimating duration from bitrate, this may be inaccurate
Input #1, ac3, from 'input_audio_stream_1.ac3' :
  Duration : 00:44:19.89, start : 0.000000, bitrate : 448 kb/s
  Stream #1:0 : Audio : ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
[ac3 @ 0x55b37502ef80] Estimating duration from bitrate, this may be inaccurate
Input #2, ac3, from 'input_audio_stream_2.ac3' :
  Duration : 00:44:19.89, start : 0.000000, bitrate : 192 kb/s
  Stream #2:0 : Audio : ac3, 48000 Hz, stereo, fltp, 192 kb/s
[ac3 @ 0x55b374efc900] Estimating duration from bitrate, this may be inaccurate
Input #3, ac3, from 'input_audio_stream_3.ac3' :
  Duration : 00:43:19.18, start : 0.000000, bitrate : 384 kb/s
  Stream #3:0 : Audio : ac3, 48000 Hz, stereo, fltp, 384 kb/s
[ac3 @ 0x55b374fd60c0] Estimating duration from bitrate, this may be inaccurate
Input #4, ac3, from 'input_audio_stream_4.ac3' :
  Duration : 00:43:19.18, start : 0.000000, bitrate : 192 kb/s
  Stream #4:0 : Audio : ac3, 48000 Hz, stereo, fltp, 192 kb/s
Input #5, srt, from 'input_subtitle_stream_1.srt' :
  Duration : N/A, bitrate : N/A
  Stream #5:0 : Subtitle : subrip
Input #6, srt, from 'input_subtitle_stream_2.srt' :
  Duration : N/A, bitrate : N/A
  Stream #6:0 : Subtitle : subrip
[matroska @ 0x55b3751a1940] Invalid stream specifier : a:0 default.
    Last message repeated 1 times


  


  I know it's reporting something with audio ([matroska @ 0x55b3751a1940] Invalid stream specifier : a:0 default. Last message repeated 1 times) but it's probably problem with my ffmpeg command.

  


• Attaching audio to video stream using ffmpeg

  5 novembre 2023, par lazarea

  My goal is to build a simple 10-second long video with a grey background, a simple text, and a simple mp3 audio to be played. I believe it should be a simple enough task ; yet, I am unable to get it right, as the audio is not attached to the video stream.

  


  My code is as follows :

  


  import subprocess
from pathlib import Path

folder_path = Path(__file__).parent.absolute()
assert folder_path / "i_have_a_cat.mp3"

ffmpeg_command = [
    'ffmpeg',
    '-y',  # Force override without prompting
    '-f', 'lavfi',
    '-i', 'color=c=gray:s=640x480:d=10',
    '-i', str(folder_path / 'i_have_a_cat.mp3'),
    '-vf', 'drawtext=text=\'I have a cat\':fontsize=24:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/3*2:enable=\'between(t,2,5)\'',
    '-t', '10',
    str(folder_path / 'output.mp4')
]

subprocess.run(ffmpeg_command)


  


  Checking the ffmpeg logs, I don't see anything extraordinary but I'll paste them here nevertheless because I might be overlooking something.

  


  Input #0, lavfi, from 'color=c=gray:s=640x480:d=10':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc

[mp3 @ 000001d271db1140] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'c:\Users\myfolder\ffmpeg_poc\i_have_a_cat.mp3':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: 00:00:00.86, start: 0.000000, bitrate: 48 kb/s
    Stream #1:0: Audio: mp3, 22050 Hz, mono, fltp, 48 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (mp3 (mp3float) -> aac (native))


  


  Output #0, mp4, to 'c:\Users\myfolder\ffmpeg_poc\output.mp4':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc     
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 69 kb/s
    Metadata:
      encoder         : Lavc58.54.100 aac
[Parsed_color_0 @ 000001d271c6b040] EOF timestamp not reliable
frame=  250 fps=0.0 q=-1.0 Lsize=      24kB time=00:00:09.88 bitrate=  19.9kbits/s speed=31.3x    
video:7kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 23.716467%
[libx264 @ 000001d271d058c0] frame I:1     Avg QP: 9.00  size:   104
[libx264 @ 000001d271d058c0] frame P:63    Avg QP: 9.21  size:    41
[libx264 @ 000001d271d058c0] frame B:186   Avg QP:12.67  size:    21
[libx264 @ 000001d271d058c0] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
[libx264 @ 000001d271d058c0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 000001d271d058c0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
[libx264 @ 000001d271d058c0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:50.0% L1:50.0% BI: 0.0%      
[libx264 @ 000001d271d058c0] 8x8 transform intra:0.0%
[libx264 @ 000001d271d058c0] coded y,uvDC,uvAC intra: 0.7% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
[libx264 @ 000001d271d058c0] i16 v,h,dc,p: 97%  0%  3%  0%
[libx264 @ 000001d271d058c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 58% 10% 17%  2%  4%  2%  2%  2%  2%
[libx264 @ 000001d271d058c0] i8c dc,h,v,p: 100%  0%  0%  0%
[libx264 @ 000001d271d058c0] Weighted P-Frames: Y:1.6% UV:0.0%
[libx264 @ 000001d271d058c0] kb/s:5.26
[aac @ 000001d271d071c0] Qavg: 24689.965


  


  Edit

  


  The output of ffprobe -i output.mp4 is as follows :

  


  ffprobe version 6.0-essentials_build-www.gyan.dev Copyright (c) 2007-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, 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-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth 
--enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --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-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:04.00, start: 0.000000, bitrate: 37 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], 6 kb/s, 25 fps, 25 tbr, 12800 tbn 
(default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 111 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]


  


• FFmpeg-command freezes app on NET MAUI Android [closed]

  28 septembre 2024, par Christian Röder

  Cheers,

  


  I'm developing a .NET MAUI app where I want to create videos from a list of images.

  


  This is the command : "-y -f concat -safe 0 -analyzeduration 100M -probesize 50M -i {Path.Combine(basePath, "input.txt")} -vf \"scale=720:1280,setsar=1:1\" -vcodec mpeg4 -pix_fmt yuv420p {outputPath}"

  


  The problem is, my app freezes when the command is executed. I've tried so much await/async/await/Task stuff, it changes nothing. The video ist created anyway...
When I'm using a simple command like "-encoders" everything is fine.

  


  This is the log when creating a video out of three images :

  


  [ffmpeg-kit] ffmpeg version n6.0
[ffmpeg-kit]  Copyright (c) 2000-2023 the FFmpeg developers
[ffmpeg-kit] 
[ffmpeg-kit]   built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
[ffmpeg-kit]   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libdav1d --enable-libkvazaar --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-libzimg --disable-openssl --enable-zlib --enable-mediacodec
[ffmpeg-kit]   libavutil      58.  2.100 / 58.  2.100
[ffmpeg-kit]   libavcodec     60.  3.100 / 60.  3.100
[ffmpeg-kit]   libavformat    60.  3.100 / 60.  3.100
[ffmpeg-kit]   libavdevice    60.  1.100 / 60.  1.100
[ffmpeg-kit]   libavfilter     9.  3.100 /  9.  3.100
[ffmpeg-kit]   libswscale      7.  1.100 /  7.  1.100
[ffmpeg-kit]   libswresample   4. 10.100 /  4. 10.100
[ffmpeg-kit] Input #0, concat, from '/data/user/0/com.companyname.myapp/cache/input.txt':
[ffmpeg-kit]   Duration: 
[ffmpeg-kit] 00:00:01.50
[ffmpeg-kit] , start: 
[ffmpeg-kit] 0.000000
[ffmpeg-kit] , bitrate: 
[ffmpeg-kit] 1 kb/s
[ffmpeg-kit] 
[ffmpeg-kit]   Stream #0:0
[ffmpeg-kit] : Video: png, rgba(pc), 1080x1970
[ffmpeg-kit] , 
[ffmpeg-kit] 25 fps, 
[ffmpeg-kit] 25 tbr, 
[ffmpeg-kit] 25 tbn
[ffmpeg-kit] 
[ffmpeg-kit] Stream mapping:
[ffmpeg-kit]   Stream #0:0 -> #0:0
[ffmpeg-kit]  (png (native) -> mpeg4 (native))
[ffmpeg-kit] 
[ffmpeg-kit] Press [q] to stop, [?] for help
[ffmpeg-kit] Output #0, mp4, to '/data/user/0/com.companyname.myapp/cache/myapp.mp4':
[ffmpeg-kit]   Metadata:
[ffmpeg-kit]     encoder         : 
[ffmpeg-kit] Lavf60.3.100
[ffmpeg-kit] 
[ffmpeg-kit]   Stream #0:0
[ffmpeg-kit] : Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, unknown/bt709/iec61966-2-1, progressive), 720x1280 [SAR 1:1 DAR 9:16], q=2-31, 200 kb/s
[ffmpeg-kit] , 
[ffmpeg-kit] 25 fps, 
[ffmpeg-kit] 12800 tbn
[ffmpeg-kit] 
[ffmpeg-kit]     Metadata:
[ffmpeg-kit]       encoder         : 
[ffmpeg-kit] Lavc60.3.100 mpeg4
[ffmpeg-kit] 
[ffmpeg-kit]     Side data:
[ffmpeg-kit]       
[ffmpeg-kit] cpb: 
[ffmpeg-kit] bitrate max/min/avg: 0/0/200000 buffer size: 0 
[ffmpeg-kit] vbv_delay: N/A
[ffmpeg-kit] 
[ffmpeg-kit] frame=    0 fps=0.0 q=4.1 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
[ffmpeg-kit] frame=   36 fps=0.0 q=2.7 Lsize=     268kB time=00:00:01.40 bitrate=1568.3kbits/s dup=33 drop=0 speed=7.18x    
[ffmpeg-kit] video:267kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 
[ffmpeg-kit] 0.382941%
[ffmpeg-kit] 


  


  I've putting the execute command in many different ways like Task.Run(() => ffmpegService.Execute(encoderCommand));