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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.

  


• FFmpeg with Quicksync : unable to hardware decode file

  9 juin 2023, par MuchToKnow

  I'm trying to convert a h264 video to h265 using hardware decoding/decoding of the iGPU (Quicksync). Decoding does not work throwing the error "Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'"

  


  I'm using the most basic example from https://trac.ffmpeg.org/wiki/Hardware/QuickSync. Hardware encoding works (in this example it's software decoded)

  


  ffmpeg -v verbose -hwaccel qsv -i VID_20230526_174925.mp4 -c:v hevc_qsv -b:v 5M output.mp4


  


  but hardware decoding does not work :

  


  ffmpeg -v verbose -hwaccel qsv -c:v h264_qsv -i VID_20230526_174925.mp4 -f null -


  


  I'm out of ideas.

  


  Full ffmpeg output :

  


  ffmpeg version 4.3.6-0+deb11u1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration: --prefix=/usr --extra-version=0+deb11u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --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-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[h264 @ 0x55d0c3b3bfc0] Reinit context to 1920x1088, pix_fmt: yuv420p
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20230526_174925.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2023-05-26T15:49:25.000000Z
    com.android.version: 10
  Duration: 00:01:22.88, start: 0.000000, bitrate: 14784 kb/s
    Stream #0:0(eng): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt709, left), 1920x1080 (1920x1088), 14517 kb/s, SAR 1:1 DAR 16:9, 29.69 fps, 29.75 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2023-05-26T15:49:25.000000Z
      handler_name    : VideoHandle
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2023-05-26T15:49:25.000000Z
      handler_name    : SoundHandle
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_qsv) -> wrapped_avframe (native))
  Stream #0:1 -> #0:1 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[graph_1_in_0_1 @ 0x55d0c3ba67c0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
[format_out_0_1 @ 0x55d0c3b5f100] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_1'
[auto_resampler_0 @ 0x55d0c3b81900] ch:2 chl:stereo fmt:fltp r:48000Hz -> ch:2 chl:stereo fmt:s16 r:48000Hz
[AVHWDeviceContext @ 0x55d0c3bb4640] Trying to use DRM render node for device 0, with matching kernel driver (i915).
[AVHWDeviceContext @ 0x55d0c3bb4640] libva: VA-API version 1.10.0
[AVHWDeviceContext @ 0x55d0c3bb4640] libva: User requested driver 'iHD'
[AVHWDeviceContext @ 0x55d0c3bb4640] libva: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
[AVHWDeviceContext @ 0x55d0c3bb4640] libva: Found init function __vaDriverInit_1_10
[AVHWDeviceContext @ 0x55d0c3bb4640] libva: va_openDriver() returns 0
[AVHWDeviceContext @ 0x55d0c3bb4640] Initialised VAAPI connection: version 1.10
[AVHWDeviceContext @ 0x55d0c3bb4640] VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 21.1.1 ().
[AVHWDeviceContext @ 0x55d0c3bb4640] Driver not found in known nonstandard list, using standard behaviour.
[AVHWDeviceContext @ 0x55d0c3bbc080] Initialize MFX session: API version is 1.34, implementation version is 1.34
[AVHWDeviceContext @ 0x55d0c3d4d200] VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 21.1.1 ().
[AVHWDeviceContext @ 0x55d0c3d4d200] Driver not found in known nonstandard list, using standard behaviour.
[h264_qsv @ 0x55d0c3b59940] Decoder: output is video memory surface
[AVHWDeviceContext @ 0x55d0c3d82640] VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 21.1.1 ().
[AVHWDeviceContext @ 0x55d0c3d82640] Driver not found in known nonstandard list, using standard behaviour.
[h264_qsv @ 0x55d0c3b59940] Decoder: output is video memory surface
[graph 0 input from stream 0:0 @ 0x55d0c3da30c0] w:1920 h:1080 pixfmt:qsv tb:1/90000 fr:119/4 sar:1/1
[auto_scaler_0 @ 0x55d0c3d6f2c0] w:iw h:ih flags:'bicubic' interl:0
[transpose @ 0x55d0c3de3600] auto-inserting filter 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0' and the filter 'transpose'
Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0
[AVIOContext @ 0x55d0c3b43140] Statistics: 670703 bytes read, 3 seeks


  


  Tried to hardware decode a h264 file and it results in the error

  


  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'


  


• python subprocess ffmpeg return code = 69

  13 juin 2023, par Tim Chen

  I try to call ffmpeg through the subprocess.run(['ffmpeg', '-i', file_name, output_file_name], capture_output=True, text=True) command in python to convert the audio file incoming from the front end to wav format file. The backend code is as follows, using python+fastapi :

  


  @app.post("/api/upload/convert")
async def convert_upload_file(request: Request, file: UploadFile = File(...)):
    token = uuid.uuid4().hex
    tmpFileName = os.path.join(os.path.dirname(__file__), token)
    with open(tmpFileName, "wb") as buffer:
        buffer.write(await file.read())
    await file.seek(0)
    output_path = tmpFileName + '-output.wav'
    command = ['ffmpeg', '-i', tmpFileName, output_path]
    result = subprocess.run(command, capture_output=True, text=True)


  


  This code usually works, but there are some scenarios where it doesn't work. The audio file is recorded by js code (specifically navigator.mediaDevices.getUserMedia({audio: true})).
The code of the audio recorded in windows chrome can run normally and get the converted wav file, but the audio recorded from ios15 safari for more than 3 seconds cannot be converted, prompting returncode=69. The error message is as follows :

  


  CompletedProcess(args=['ffmpeg', '-i', '5cfb52c503a646bda0f422b517c8014a', '5cfb52c503a646bda0f422b517c8014a-output.wav'], returncode=69, stdout='', stderr="
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --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-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --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 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil      56. 70.100 / 56. 70.100
libavcodec     58.134.100 / 58.134.100
libavformat    58. 76.100 / 58. 76.100
libavdevice    58. 13.100 / 58. 13.100
libavfilter     7.110.100 /  7.110.100
libswscale      5.  9.100 /  5.  9.100
libswresample   3.  9.100 /  3.  9.100
libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '5cfb52c503a646bda0f422b517c8014a':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    creation_time   : 2023-06-11T16:36:53.000000Z
  Duration: 00:00:07.06, start: 0.000000, bitrate: 187 kb/s
  Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 184 kb/s (default)
    Metadata:
      creation_time   : 2023-06-11T16:36:53.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to '5cfb52c503a646bda0f422b517c8014a-output.wav':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    ISFT            : Lavf58.76.100
  Stream #0:0(und): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s16, 768 kb/s (default)
    Metadata:
      creation_time   : 2023-06-11T16:36:53.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
      encoder         : Lavc58.134.100 pcm_s16le
size=       2kB time=00:00:00.00 bitrate=N/A speed=N/A    
[aac @ 0x55f1f8f19fc0] Sample rate index in program config element does not match the sample rate index configured by the container.
[aac @ 0x55f1f8f19fc0] Too large remapped id is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[aac @ 0x55f1f8f19fc0] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
Error while decoding stream #0:0: Not yet implemented in FFmpeg, patches welcome
[aac @ 0x55f1f8f19fc0] Multiple frames in a packet.
[aac @ 0x55f1f8f19fc0] Reserved bit set.
[aac @ 0x55f1f8f19fc0] Number of bands (18) exceeds limit (13).
Error while decoding stream #0:0: Invalid data found when processing input
[aac @ 0x55f1f8f19fc0] Reserved bit set.
[aac @ 0x55f1f8f19fc0] Prediction is not allowed in AAC-LC.
Error while decoding stream #0:0: Invalid data found when processing input
[aac @ 0x55f1f8f19fc0] Reserved bit set.


  


  For the abnormal code, I tried to execute ffmpeg -i input output.wav after fastapi handle request on the command line and subprocess.run(['ffmpeg', '-i', file_name, output_path], capture_output =True, text=True), all succeeded, which means that the final file must be normal, otherwise the subsequent verification work will get the same error.

  


  This confuses me, is there some information I'm missing ?