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• FFMpeg - can't manage to create DnxHR files in Rec2020 / 4:4:4 Chroma sampling

  20 mai 2019, par Shouille

  I’m trying to convert an image sequence into a Quicktime DnxHR with 4:4:4 sampling in Rec2020 colorspace using FFMpeg 4.1.3. But I’m always ending with 4:2:0 Rec709 file.

  In my lastest attempt FFMpeg seems to de the right thing :

  ffmpeg.exe -y -i "C:/TEST/final-%04d.dpx" -c:v dnxhd -vf "scale=3840:2160,fps=24,format=yuv444p12le" -profile:v dnxhr_444 -color_primaries 9 -colorspace 9 -color_range 2 C:/TEST/test.mov

  During encoding the output stream is shown as 444 / bt2020

  Output #0, mov, to 'C:/TEST/test.mov':
  
    Metadata:
  
    encoder         : Lavf58.20.100
  
    Stream #0:0: Video: dnxhd (DNXHR 444) (AVdh / 0x68645641), yuv444p10le(pc, bt2020nc/bt2020/unknown), 3840x2160, q=2-1024, 200 kb/s, 24 fps, 12288 tbn, 24 tbc
  
    Metadata:
  
      encoder         : Lavc58.35.100 dnxhd
  
    frame=   10 fps=3.3 q=1.0 Lsize=   71161kB time=00:00:00.37 
  
    bitrate=1554195.5kbits/s speed=0.122x
  
    video:71160kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001114%

  But when I inspect the output file FFMpeg says it’s in bt709

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:/TEST/test.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 512
  
      compatible_brands: qt
  
      encoder         : Lavf58.20.100
  
    Duration: 00:00:00.42, start: 0.000000, bitrate: 1397959 kb/s
  
      Stream #0:0(eng): Video: dnxhd (DNXHR 444) (AVdh / 0x68645641), 
  
  yuv444p10le(pc, bt709/unknown/unknown), 3840x2160, 1399062 kb/s, 24 fps, 24 tbr, 12288 tbn, 12288 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc58.35.100 dnxhd

  And softwares like MediaInfo say the chroma sampling is in 4.2.0

  Any ideas ?

  As ask in the comment, the full log of the conversion :

  C:\Users\pierrech>ffmpeg.exe -y -i "C:/TEST/final-%04d.dpx" -c:v dnxhd -vf colorspace=all=bt2020:iall=bt2020 -profile:v dnxhr_444 -color_primaries bt2020 -colorspace bt2020_ncl -color_range 2 -color_trc bt2020_12bit C:/TEST/test.mov
  
  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.3.1 (GCC) 20190414
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, image2, from 'C:/TEST/final-%04d.dpx':
  
    Duration: 00:00:00.40, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: dpx, rgb48le, 3840x2160, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (dpx (native) -> dnxhd (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mov, to 'C:/TEST/test.mov':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: dnxhd (DNXHR 444) (AVdh / 0x68645641), yuv444p10le(pc, bt2020nc/bt2020/bt2020-12), 3840x2160, q=2-1024, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc58.35.100 dnxhd
  
  frame=   10 fps=3.8 q=1.0 Lsize=   71161kB time=00:00:00.36 bitrate=1618952.6kbits/s speed=0.136x
  
  video:71160kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.001114%

  And after the conversion

  C:\Users\pierrech>ffmpeg.exe  -i C:\TEST\test.mov -hide_banner
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\TEST\test.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 512
  
      compatible_brands: qt
  
      encoder         : Lavf58.20.100
  
    Duration: 00:00:00.40, start: 0.000000, bitrate: 1457373 kb/s
  
      Stream #0:0(eng): Video: dnxhd (DNXHR 444) (AVdh / 0x68645641), yuv444p10le(pc, bt709/unknown/unknown), 3840x2160, 1457356 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc58.35.100 dnxhd
  
  At least one output file must be specified

• What is the best way to check if audio embedded in video is ambisonic ?

  20 mai 2019, par GrzegorzW

  We are making 360 video player for VR headsets using Unity. We are trying to achieve spatial audio. The easiest case is when video and audio are in separated files, but now we decided to support also videos with embedded audio. I need to know before i load video if audio is ambisonic or not. I’m looking for an easy way to decide if audio is ambisonic in order to separate it from video and convert to .tbe file, which is currently supported by our app.

  I was trying to use ffmpeg :

  $./ffmpeg.exe -i ~/Videos/video.mp4

  and got :

  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.3.1 (GCC) 20190414
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:/Users/Medion/Videos/video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.101
  
    Duration: 00:11:39.40, start: 0.000000, bitrate: 17290 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 16497 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Side data:
  
        stereo3d: top and bottom
  
        spherical: equirectangular (0.000000/0.000000/0.000000)
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 778 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 4 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  At least one output file must be specified

  but I don’t see any line that could indicate that audio is ambisonic. I see that there are 4 channels in streams #0:1 and #0:2, but I bet it’s not enough.

  I’ve also tried MediaInfo but it’s the same thing :

  General
  
  CompleteName                     : C:\Users\Medion\Videos\video.mp4
  
  Format/String                    : MPEG-4
  
  Format_Profile                   : Base Media
  
  CodecID/String                   : isom (isom/iso2/avc1/mp41)
  
  FileSize/String                  : 1.41 GiB
  
  Duration/String                  : 11 min 39 s
  
  OverallBitRate_Mode/String       : Variable
  
  OverallBitRate/String            : 17.3 Mb/s
  
  Encoded_Application/String       : Lavf57.56.101
  
  
  
  Video
  
  ID/String                        : 1
  
  Format/String                    : AVC
  
  Format/Info                      : Advanced Video Codec
  
  Format_Profile                   : High@L5.2
  
  Format_Settings                  : CABAC / 3 Ref Frames
  
  Format_Settings_CABAC/String     : Yes
  
  Format_Settings_RefFrames/String : 3 frames
  
  Format_Settings_GOP              : M=3, N=29
  
  CodecID                          : avc1
  
  CodecID/Info                     : Advanced Video Coding
  
  Duration/String                  : 11 min 39 s
  
  BitRate_Mode/String              : Variable
  
  BitRate/String                   : 16.5 Mb/s
  
  BitRate_Maximum/String           : 20.0 Mb/s
  
  Width/String                     : 3 840 pixels
  
  Height/String                    : 2 160 pixels
  
  DisplayAspectRatio/String        : 16:9
  
  FrameRate_Mode/String            : Constant
  
  FrameRate/String                 : 29.970 (30000/1001) FPS
  
  Standard                         : NTSC
  
  ColorSpace                       : YUV
  
  ChromaSubsampling/String         : 4:2:0
  
  BitDepth/String                  : 8 bits
  
  ScanType/String                  : Progressive
  
  Bits-(Pixel*Frame)               : 0.066
  
  StreamSize/String                : 1.34 GiB (95%)
  
  Language/String                  : English
  
  Tagged_Date                      : UTC 2017-06-13 17:37:51
  
  colour_range                     : Limited
  
  colour_primaries                 : BT.709
  
  transfer_characteristics         : BT.709
  
  matrix_coefficients              : BT.709
  
  Codec configuration box          : avcC
  
  
  
  Audio #1
  
  ID/String                        : 2
  
  Format/String                    : AAC LC
  
  Format/Info                      : Advanced Audio Codec Low Complexity
  
  CodecID                          : mp4a-40-2
  
  Duration/String                  : 11 min 39 s
  
  Source_Duration/String           : 11 min 39 s
  
  BitRate_Mode/String              : Constant
  
  BitRate/String                   : 779 kb/s
  
  Channel(s)/String                : 4 channels
  
  ChannelLayout                    : C L R Cb
  
  SamplingRate/String              : 48.0 kHz
  
  FrameRate/String                 : 46.875 FPS (1024 SPF)
  
  Compression_Mode/String          : Lossy
  
  StreamSize/String                : 64.9 MiB (5%)
  
  Source_StreamSize/String         : 64.9 MiB (5%)
  
  Default/String                   : Yes
  
  AlternateGroup/String            : 1
  
  Tagged_Date                      : UTC 2017-06-13 17:37:51
  
  
  
  Audio #2
  
  ID/String                        : 3
  
  Format/String                    : AAC LC
  
  Format/Info                      : Advanced Audio Codec Low Complexity
  
  CodecID                          : mp4a-40-2
  
  Duration/String                  : 11 min 39 s
  
  Source_Duration/String           : 11 min 39 s
  
  BitRate_Mode/String              : Variable
  
  BitRate/String                   : 4 900 b/s
  
  BitRate_Maximum/String           : 266 kb/s
  
  Channel(s)/String                : 4 channels
  
  ChannelLayout                    : C L R Cb
  
  SamplingRate/String              : 48.0 kHz
  
  FrameRate/String                 : 46.875 FPS (1024 SPF)
  
  Compression_Mode/String          : Lossy
  
  StreamSize/String                : 418 KiB (0%)
  
  Source_StreamSize/String         : 418 KiB (0%)
  
  Default/String                   : No
  
  AlternateGroup/String            : 1
  
  Tagged_Date                      : UTC 2017-06-13 17:37:51
  
  
  
  Audio #3
  
  ID/String                        : 4
  
  Format/String                    : AAC LC
  
  Format/Info                      : Advanced Audio Codec Low Complexity
  
  CodecID                          : mp4a-40-2
  
  Duration/String                  : 11 min 39 s
  
  Source_Duration/String           : 11 min 39 s
  
  BitRate_Mode/String              : Variable
  
  BitRate/String                   : 2 275 b/s
  
  BitRate_Maximum/String           : 128 kb/s
  
  Channel(s)/String                : 2 channels
  
  ChannelLayout                    : L R
  
  SamplingRate/String              : 48.0 kHz
  
  FrameRate/String                 : 46.875 FPS (1024 SPF)
  
  Compression_Mode/String          : Lossy
  
  StreamSize/String                : 194 KiB (0%)
  
  Source_StreamSize/String         : 194 KiB (0%)
  
  Default/String                   : No
  
  AlternateGroup/String            : 1
  
  Tagged_Date                      : UTC 2017-06-13 17:37:51

  I assume that I don’t know what to look for in those outputs.
  Thanks in advance.

• PHP/FFmpeg can not save video

  19 mai 2019, par tour travel

  The error is :

  [Sun May 19 11:41:03.158185 2019] [php7:error] [pid 32405] [client
  85.133.232.4:35172] PHP Fatal error : Uncaught Alchemy\BinaryDriver\Exception\ExecutionFailureException : ffmpeg
  failed to execute command ’/usr/bin/ffmpeg’ ’-y’ ’-i’ ’Sample.mp4’
  ’-async’ ’1’ ’-metadata:s:v:0’ ’start_time=0’ ’-f’ ’webm’ ’-vcodec’
  ’libvpx’ ’-acodec’ ’libvorbis’ ’-b:v’ ’1000k’ ’-refs’ ’6’ ’-coder’ ’1’
  ’-sc_threshold’ ’40’ ’-flags’ ’+loop’ ’-me_range’ ’16’ ’-subq’ ’7’
  ’-i_qfactor’ ’0.71’ ’-qcomp’ ’0.6’ ’-qdiff’ ’4’ ’-trellis’ ’1’ ’-b:a’
  ’128k’ ’-vf’ ’[in]scale=320:240 [out]’ ’export-webm.webm’ in
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php:100\nStack
  trace :\n#0
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php(72) :
  Alchemy\BinaryDriver\ProcessRunner->doExecutionFailure(’’/usr/bin/ffmpe...’)\n#1
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php(209) :
  Alchemy\BinaryDriver\ProcessRunner->run(Object(Symfony\Component\Process\Process),
  Object(SplObjectStorage), false)\n#2
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php(137) :
  Alchemy\BinaryDr in
  /vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Media/AbstractVideo.php on
  line 106a

  What I trying to do is, save video :

  require '/vendor/autoload.php';
  
  $ffmpeg = FFMpeg\FFMpeg::create();
  
  $ffprobe = FFMpeg\FFProbe::create();
  
  $video = $ffmpeg->open('Sample.mp4');
  
  $video
  
      ->filters()
  
      ->resize(new FFMpeg\Coordinate\Dimension(320, 240))
  
      ->synchronize();
  
  $video
  
      ->save(new FFMpeg\Format\Video\X264('aac'), 'export-x264.mp4')

  What I have done :

  I searched and similar topics tell me to set permission to my files and folders, I set user and also set 755 to files and folders but still I have this error and no success, any idea ?

  Errorlog :

  Fatal error : Uncaught
  Alchemy\BinaryDriver\Exception\ExecutionFailureException : ffmpeg
  failed to execute command ’/usr/bin/ffmpeg’ ’-y’ ’-i’ ’Sample.mp4’
  ’-async’ ’1’ ’-metadata:s:v:0’ ’start_time=0’ ’-vcodec’ ’libx264’
  ’-acodec’ ’aac’ ’-b:v’ ’1000k’ ’-refs’ ’6’ ’-coder’ ’1’
  ’-sc_threshold’ ’40’ ’-flags’ ’+loop’ ’-me_range’ ’16’ ’-subq’ ’7’
  ’-i_qfactor’ ’0.71’ ’-qcomp’ ’0.6’ ’-qdiff’ ’4’ ’-trellis’ ’1’ ’-b:a’
  ’128k’ ’-vf’ ’[in]scale=320:240 [out]’ ’-pass’ ’1’ ’-passlogfile’
  ’/tmp/ffmpeg-passes5ce11d01dc0038yfbl/pass-5ce11d01dc0c7’
  ’export-x264.mp4’ in
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php:100
  Stack trace : #0
  /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/ProcessRunner.php(72) :
  Alchemy\BinaryDriver\ProcessRunner->doExecutionFailure(’’/usr/bin/ffmpe...’)

  1 /vendor/alchemy/binary-driver/src/Alchemy/BinaryDriver/AbstractBinary.php(209) :

  Alchemy\BinaryDriver\ProcessRunner->run(Object(Symfony\Component\Process\Process),
  Object(SplObjectStorage), false) #2 /vendor/alchemy/binary-driver in
  /vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/Media/AbstractVideo.php on
  line 106