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• avcodec/videotoolbox : fix use of unknown builtin '__builtin_available'

  2 décembre 2021, par Limin Wang

  avcodec/videotoolbox : fix use of unknown builtin '__builtin_available'
  Old system is :
  
  OSX version : 10.11.6
  
  Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
  Target : x86_64-apple-darwin15.6.0
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] libavcodec/videotoolbox.c

• how can I transform 6 audio channels into one 5.1 channel with ffmpeg ?

  3 février 2014, par user2216280

  I have a pro-res file which has 6 mono audio channels.
  here's the ffmpeg console :

      :\test-remapping>ffmpeg -i MelleParadis_PART1_CONSTANTE.mov
  
  ffmpeg version N-60106-ge6d1c66 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 22 2014 22:01:26 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 63.100 / 52. 63.100
  
    libavcodec     55. 49.100 / 55. 49.100
  
    libavformat    55. 25.101 / 55. 25.101
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  1.100 /  4.  1.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  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
  
  Guessed Channel Layout for  Input Stream #0.5 : mono
  
  Guessed Channel Layout for  Input Stream #0.6 : mono
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MelleParadis_PART1_CONSTANTE.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2013-11-27 18:58:26
  
    Duration: 00:07:34.32, start: 0.000000, bitrate: 117742 kb/s
  
      Stream #0:0(eng): Video: prores (apcn / 0x6E637061), yuv422p10le, 1920x1080,
  
   113098 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
        timecode        : 01:00:00:00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
      Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
      Stream #0:3(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
      Stream #0:4(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
      Stream #0:5(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
      Stream #0:6(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16,
  
   768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 18:58:26
  
        handler_name    : Gestionnaire dıalias Apple
  
      Stream #0:7(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2013-11-27 19:03:46
  
        handler_name    : Gestionnaire dıalias Apple
  
        timecode        : 01:00:00:00``

  I would like to transform them into one 5.1 audio channel

  I try this line of code :

  D:\test-remapping>ffmpeg -i "MelleParadis_PART1_CONSTANTE.mov" -c copy -c:a ac3 -map 0 mlle5.1.mov

  the console replies "NOT ENOUGH SPACE" and stop...
  of course there's still some space in my hard drive...
  How could I map all the 6 mono streams into 5.1 ?
  thanks in advance.
  pauline

• iOS Objective C Opus audio stream kAudioFormatOpus — specification / conversion query

  16 avril 2022, par deffodeffo

  I'm working on a React Native voice app wanting to record straight to an Opus stream.

  


  On the iOS side at device level, I'm working in Objective C and I'm using an AVAudioSession recorder with formatID set to kAudioFormatOpus. The recorder captures audio data in the specified format and passes packets for upstreaming to the React Native app.

  


  This is all working well and emitting a stream of audio data when I run my code on an iOS Simulator or real device.

  


  My problem is when I receive the audio stream in the backend, I find I'm unable to reliably decode the Opus stream using ffmpeg. (I wish to decode to PCM.)

  


  Whilst I could post up specific code to show what I'm doing in more detail, my question at this stage is more generic in nature :

  


  Is anyone familiar with the format of Opus audio stream that is generated by iOS AudioSession recorder under audio format kAudioFormatOpus ? Is anyone able to suggest proven conversion techniques ? (e.g. some ffmpeg commands), or else hook me up with some links to format specs so I can figure out what is going on here ?

  


  The Apple Developer documentation contains zero useful information : https://developer.apple.com/documentation/coreaudiotypes/1572096-audio_data_format_identifiers/kaudioformatopus?changes=la__2&language=objc

  


  I have looked all over the internet, but I'm unable to find any useful spec info that corresponds to the stream that AVAudioSession recorder is outputting. I have seen a few posts which say Apple have not fully complied with the Opus spec, but I don't know enough about the proper structure of Opus to ascertain this for myself.

  


  Any help would be very much appreciated.

  


  Thanks all