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• 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

• Video file not trimming and copying using FFMpeg in C#

  15 mai 2019, par chapperzuk

  I am trying to clip a video using C# in Visual Studios with FFMpeg. I run the code below and it doesn’t come back with any errors, except it doesn’t create a new video file.

  I’ve looked around here to make sure I’m using the correct code, but after multiple attempts it still won’t copy.

  string videoFile = @"C:\Users\dave\Documents\video 1.mp4";
  
  string outputFile = @"C:\Users\dave\Documents\video 2.mp4";
  
  
  
  Process process = new Process();
  
  process.StartInfo.RedirectStandardOutput = true;
  
  process.StartInfo.RedirectStandardError = true;
  
  process.StartInfo.FileName = @"C:\Users\dave\Documents\ffmpeg.exe";
  
  process.StartInfo.Arguments = "ffmpeg -i " + videoFile + " -ss 00:30:00 -t 00:00:10 -c copy " + outputFile;
  
  process.StartInfo.UseShellExecute = false;
  
  process.StartInfo.CreateNoWindow = true;
  
  process.Start();

  I was expecting to get a video cut from the original video, starting at the 30 second mark and lasting 10 seconds, but nothing is created.

  I am using the latest FFMpeg from https://ffmpeg.zeranoe.com/builds/

  UPDATE If I run the code in command prompt - The file comes out corrupt though

  ffmpeg -i "C:\\Users\\dave\\Documents\\video 1.mp4" -ss 00:30:00 -t 00:00:10 -c copy "C:\\Users\\dave\\Documents\\video 2.mp4"
  
  ffmpeg version N-93851-gdcc999819d 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-libdav1d --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 --enable-libopenmpt
  
    libavutil      56. 27.100 / 56. 27.100
  
    libavcodec     58. 52.101 / 58. 52.101
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 51.100 /  7. 51.100
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\\Users\\dave\\Documents\\video 1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      creation_time   : 2019-01-15T21:57:04.000000Z
  
      title           : My Movie
  
      encoder         : Lavf56.15.102
  
      description     : This video is about My Movie
  
    Duration: 00:06:48.22, start: 0.000000, bitrate: 1283 kb/s
  
      Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 1202 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 2997 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-01-15T21:57:04.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 74 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-01-15T21:57:04.000000Z
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to 'C:\\Users\\dave\\Documents\\video 2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      description     : This video is about My Movie
  
      title           : My Movie
  
      encoder         : Lavf58.27.103
  
      Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 1202 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 11988 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-01-15T21:57:04.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 74 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-01-15T21:57:04.000000Z
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown