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• Downmixing multi-channel audio with FFMPEG

  28 mars 2018, par anorak

  I am trying to use FFMPEG to produce a new version of a video with multi-channel audio, including two identical 4.0 channel audio streams, and one different stereo audio stream.

  Here is the result I get from running ffmpeg -i for the file on my Mac :

  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared -- 
  
  enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables -- 
  
  enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
  libavutil      55. 34.101 / 55. 34.101
  
  libavcodec     57. 64.101 / 57. 64.101
  
  libavformat    57. 56.101 / 57. 56.101
  
  libavdevice    57.  1.100 / 57.  1.100
  
  libavfilter     6. 65.100 /  6. 65.100
  
  libavresample   3.  1.  0 /  3.  1.  0
  
  libswscale      4.  2.100 /  4.  2.100
  
  libswresample   2.  3.100 /  2.  3.100
  
  libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf57.56.100
  
  Duration: 00:05:37.83, start: 0.000000, bitrate: 13072 kb/s
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 3840x1920, 11237 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 739 kb/s (default)
  
  Metadata:
  
    handler_name    : GPAC face Handler
  
  Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 764 kb/s
  
  Metadata:
  
    handler_name    : GPAC face Handler
  
  Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 323 kb/s
  
  Metadata:
  
    handler_name    : GPAC face Handler

  ---

  I’d like to do one of the following :

  • Only use the stereo audio track from stream 0:3

  • Merge the stereo audio track from stream 0:3 with the 4.0 channel audio from stream 0:1 into a new stereo audio track containing audio from both streams. This would be preferred but may be more difficult.

  I’ve tried a variety of methods I’ve found online but nothing seems to be getting either of the specified results above.

  I would also like to convert the video to H265 as losslessly as possible, but this should be able to be accomplished in a subsequent step.

  I am also open to using other tools but I like how fast FFMPEG tends to work and it works well on my Mac.

• ffmpeg doesn't recognize Quicktime DV codec

  8 août 2017, par 3pointedit

  I have had success with excellent advice, on a Mac OSX10.5, converting a modified MXF media structure to h264 while retaining multitrack audio. But I cannot get ffmpeg to work in Windows environment.

  See this page.

  Here’s the result of latest failure-

  Microsoft Windows [Version 6.1.7601]
  
  Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
  
  
  
  F:\>h:
  
  
  
  H:\>cd conversion folder
  
  
  
  
  
  H:\Conversion folder>ffmpeg ffmpeg -report -enable_drefs 1 -use_absolute_path 1
  
  -i fdb9_AerialsEagleFarm_0610.mov -map 0:v -map 0:a -write_tmcd 1 fd9_AerialsEag
  
  leFarm_A0609.mp4
  
  ffmpeg started on 2017-08-08 at 15:01:24
  
  Report written to "ffmpeg-20170808-150124.log"
  
  ffmpeg version N-86950-g1bef008 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
  
  nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
  
  enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
  
  --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
  
  bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
  
  -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
  
  e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
  
  bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
  
  e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
   --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
  
  -libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 70.100 / 55. 70.100
  
    libavcodec     57.102.100 / 57.102.100
  
    libavformat    57. 76.100 / 57. 76.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 98.100 /  6. 98.100
  
    libswscale      4.  7.102 /  4.  7.102
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] Opening 'video.vid' for reading
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] stream 0, error opening alias: path
  
  ='/VibrintAVFiles/Xchange In/fdb9_AerialsEagleFarm_0610.vmf/video.vid', dir='fdb
  
  9_AerialsEagleFarm_0610.vmf', filename='video.vid', volume='default', nlvl_from=
  
  1, nlvl_to=1
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] Opening 'audio_0.pcm' for reading
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] stream 1, error opening alias: path
  
  ='/VibrintAVFiles/Xchange In/fdb9_AerialsEagleFarm_0610.vmf/audio_0.pcm', dir='f
  
  db9_AerialsEagleFarm_0610.vmf', filename='audio_0.pcm', volume='default', nlvl_f
  
  rom=1, nlvl_to=1
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] Opening 'audio_1.pcm' for reading
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] stream 2, error opening alias: path
  
  ='/VibrintAVFiles/Xchange In/fdb9_AerialsEagleFarm_0610.vmf/audio_1.pcm', dir='f
  
  db9_AerialsEagleFarm_0610.vmf', filename='audio_1.pcm', volume='default', nlvl_f
  
  rom=1, nlvl_to=1
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] Opening 'audio_2.pcm' for reading
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] stream 3, error opening alias: path
  
  ='/VibrintAVFiles/Xchange In/fdb9_AerialsEagleFarm_0610.vmf/audio_2.pcm', dir='f
  
  db9_AerialsEagleFarm_0610.vmf', filename='audio_2.pcm', volume='default', nlvl_f
  
  rom=1, nlvl_to=1
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] Opening 'audio_3.pcm' for reading
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] stream 4, error opening alias: path
  
  ='/VibrintAVFiles/Xchange In/fdb9_AerialsEagleFarm_0610.vmf/audio_3.pcm', dir='f
  
  db9_AerialsEagleFarm_0610.vmf', filename='audio_3.pcm', volume='default', nlvl_f
  
  rom=1, nlvl_to=1
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005c99a0] Could not find codec parameters for
  
   stream 0 (Video: dvvideo (dvpp / 0x70707664), none, 720x576, 28800 kb/s): unspe
  
  cified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Guessed Channel Layout for Input Stream #0.2 : mono
  
  Guessed Channel Layout for Input Stream #0.3 : mono
  
  Guessed Channel Layout for Input Stream #0.4 : mono
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fdb9_AerialsEagleFarm_0610.mov':
  
    Metadata:
  
      creation_time   : 2016-10-06T07:01:58.000000Z
  
    Duration: 00:12:43.90, start: 0.000000, bitrate: 1 kb/s
  
      Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), none, 720x576, 28800 k
  
  b/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-06T07:01:58.000000Z
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 01:17:27:12
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-06T07:01:58.000000Z
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-06T07:01:58.000000Z
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-06T07:01:58.000000Z
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:4(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-06T07:01:58.000000Z
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:5(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2016-10-06T07:01:58.000000Z
  
        handler_name    : Apple Handle Data Handler
  
        timecode        : 01:17:27:12
  
  [NULL @ 00000000005cad20] Unable to find a suitable output format for 'ffmpeg'
  
  ffmpeg: Invalid argument

  And a screen grab of file structure (although I’m using an alias for target)

  

• Input/output error while using ffmpeg with pulse

  2 septembre 2017, par user116522

  i want to record my audio output. Yesterday, i used the following command

  ffmpeg -f pulse -ac 2 -i 1 -c:a libfdk_aac -b:a 192k test4.m4a

  and it was working. But now, i receive the output :

   ffmpeg version N-83415-g012dd8c Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8 (SUSE Linux)
  
    configuration: --enable-gpl --enable-libx264 --enable-libx265 --enable-nonfree --enable-libfdk-aac --enable-libpulse
  
    libavutil      55. 46.100 / 55. 46.100
  
    libavcodec     57. 75.100 / 57. 75.100
  
    libavformat    57. 66.101 / 57. 66.101
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 73.100 /  6. 73.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  1: Input/output error

  The command

  pactl list sources

  says :

  Source #0
  
          State: SUSPENDED
  
          Name: alsa_output.pci-0000_01_00.1.hdmi-stereo.monitor
  
          Description: Monitor of HDA NVidia Digital Stereo (HDMI)
  
          Driver: module-alsa-card.c
  
          Sample Specification: s16le 2ch 44100Hz
  
          Channel Map: front-left,front-right
  
          Owner Module: 6
  
          Mute: no
  
          Volume: front-left: 65536 / 100% / 0,00 dB,   front-right: 65536 / 100% / 0,00 dB
  
                  balance 0,00
  
          Base Volume: 65536 / 100% / 0,00 dB
  
          Monitor of Sink: alsa_output.pci-0000_01_00.1.hdmi-stereo
  
          Latency: 0 usec, configured 0 usec
  
          Flags: DECIBEL_VOLUME LATENCY 
  
          Properties:
  
                  device.description = "Monitor of HDA NVidia Digital Stereo (HDMI)"
  
                  device.class = "monitor"
  
                  alsa.card = "1"
  
                  alsa.card_name = "HDA NVidia"
  
                  alsa.long_card_name = "HDA NVidia at 0xf7080000 irq 17"
  
                  alsa.driver_name = "snd_hda_intel"
  
                  device.bus_path = "pci-0000:01:00.1"
  
                  sysfs.path = "/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1"
  
                  device.bus = "pci"
  
                  device.vendor.id = "10de"
  
                  device.vendor.name = "NVIDIA Corporation"
  
                  device.product.id = "0fb9"
  
                  device.string = "1"
  
                  module-udev-detect.discovered = "1"
  
                  device.icon_name = "audio-card-pci"
  
          Formats:
  
                  pcm