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• Join mp4 files in linux [migrated]

  18 décembre 2012, par Jose Armando

  I want to join two mp4 files to create a single one. The video streams are encoded in h264 and the audio in aac. I can not re-encode the videos to another format due to computational reasons. Also, I cannot use any gui programs, all processing must be performed with linux command line utilities. FFmpeg cannot do this for mpeg4 files so instead I used MP4Box

  e.g. MP4Box -add video1.mp4 -cat video2.mp4 newvideo.mp4

  unfortunately the audio gets all mixed up. I thought that the problem was that the audio was in aac so I transcoded it in mp3 and used again MP4Box. In this case the audio is fine for the first half of newvideo.mp4 (corresponding to video1.mp4) but then their is no audio and I cannot navigate in the video also. My next thought was that the audio and video streams had some small discrepancies in their lengths that I should fix. So for each input video I splitted the video and audio streams and then joined them with the -shortest option in ffmpeg.

  thus for the first video I ran

   avconv -y -i video1.mp4 -c copy -map 0:0 videostream1.mp4
  
  
  
   avconv -y -i video1.mp4 -c copy -map 0:1 audiostream1.m4a
  
  
  
   avconv -y -i videostream1.mp4 -i audiostream1.m4a  -c copy -shortest  video1_aligned.mp4

  similarly for the second video and then used MP4Box as previously. Unfortunately this didn't work either. The only success I had was when I joined the video streams separetely (i.e. videostream1.mp4 and videostream2.mp4) and the audio streams (i.e. audiostream1.m4a and audiostream2.m4a) and then joined the video and audio in a final file. However, the synchronization is lost for the second half of the video. Concretelly, there is a 1 sec delay of audio and video. Any suggestions are really welcome.

• FFMPEG .oma to .mp3 "Unsupported codec 5 !" with a big file

  27 mars 2017, par Ventura

  I’m trying to convert a .OMA file to .MP3 but no success with a specific file.

  If I try :

  ffmpeg -i audio1.oma -f mp3 output.mp3

  The file is converted successfully. The file audio1.oma is a 3 MB file.

  Full output :

  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
  
  [oma @ 0x7f8fc4000000] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, oma, from 'audio1.oma':
  
    Metadata:
  
      title           : Is This It
  
      artist          : The Strokes
  
      album           : Is This It
  
      genre           : Rock
  
      OMG_TRLDA       : 2001/01/01 00:00:00
  
      TLEN            : 153000
  
    Duration: 00:02:33.36, start: 0.000000, bitrate: 128 kb/s
  
      Stream #0:0: Audio: mp3 ([3][0][0][0] / 0x0003), 44100 Hz, stereo, s16p, 128 kb/s
  
  Output #0, mp3, to 'output.mp3':
  
    Metadata:
  
      TIT2            : Is This It
  
      TPE1            : The Strokes
  
      TALB            : Is This It
  
      TCON            : Rock
  
      OMG_TRLDA       : 2001/01/01 00:00:00
  
      TLEN            : 153000
  
      TSSE            : Lavf57.56.101
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
  
      Metadata:
  
        encoder         : Lavc57.64.101 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  size=    2397kB time=00:02:33.35 bitrate= 128.0kbits/s speed=37.2x    
  
  video:0kB audio:2397kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.016094%

  If I try the same with another .oma (53 MB) I’m getting the error :

  Unsupported codec 5 ! audio2.oma : Function not implemented

  Full output :

  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
  
  [oma @ 0x7f8792000000] Unsupported codec 5!
  
  audio2.OMA: Function not implemented

  Both audios works fine when using the MP3 Player.
  The first audio which works is just a random song from my MP3 player to test.
  The second file was recorded in a music studio playing live with multiple channels.

  Anything I’m missing here ?

• Converting mkv to h264 FFmpeg

  14 janvier 2021, par Rikus Honey

  EDIT :
This question has become very popular and is one of the top results for searching "convert mkv to h264 ffmpeg" and thus I feel it is appropriate to add that for anyone stumbling upon this question to rather use

  


  ffmpeg -i input.mkv -c:v libx264 -c:a aac output.mp4


  


  as libvo_aacenc has been removed in recent versions of FFmpeg and it now has a native aac encoder. For more information visit the FFmpeg wiki page for encoding AAC.

  


  Here is the original question :

  


  I would like to convert my .mkv files to .mp4 using FFmpeg. I have tried the following code :

  


  ffmpeg -i input.mkv -c:v libx264 -c:a libvo_aacenc output.mp4


  


  But I get the error :

  


  


  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height.

  


  


  Is there any way to get around this ? I have tried setting the bitrate of the audio but the problem seems to persist.