Newest 'ffmpeg' Questions - Stack Overflow

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• Fffmpeg mapping audio and video by language

  28 mars 2017, par Terrabyte

  I want to batch convert these mkv files, they contain more than one language. Instances include: Eng/Ger, Eng/JPN. Sometimes there are multiple video sources within the mkv for whatever reason:

  ive tried using:

  FFMPEG_PATH . ' -i ' . $localFile . ' -sn -map 0:v:0 -map 0:a:m:language:jpn -c:v ' . $videoCodec . ' -tune animation -crf 20 -refs 6 -bf 6 -trellis 1 -b_strategy 1 -profile:v high -level 4.0 -pix_fmt yuv420p -ac 2 -flags +aic+mv4 ' . $scale . ' ' . $convertedFilename;
  

  This one grabs the first video (this doesnt matter, but i need it to grab one video just in case)

  -map 0:v:0 -map 
  

  I don't thing this one works because when i tried it, it grabbed the english one instead so i dont know the issue.

  0:a:m:language:jpn
  

  I could do

  0:m:language:jpn
  

  but then id have to remove: 0:v:0 and sometimes theres a issue where just using the general mapping would encode both video sources so it wold double in file sizes

  so how would i just map the audio file while keeping the video mapping? Fgmpeg is really confusing with this instruction.

• ffmpeg - remove sequentially duplicate frames

  27 mars 2017, par metlira

  Is there any way to detect duplicate frames within the video using ffmpeg.

  I tried -vf flag with select=gt(scene\,0.xxx) for scene change. But, it did not work for my case.

• FFMpeg open a DVD VOB chain ?

  27 mars 2017, par Sugrue

  I'm new to FFMpeg so this may be a dumb question, but I don't see the answer in the documentation.

  I want to decode frames from a DVD vob files. Opening the first VOB in the group works fine, but how do I tell ffmpeg to continue on to the next VOB and read all the VOBs on a DVD?

  I have the VOB files in a folder on a hard disk.

• 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?

• There are error about ffmpeg in python

  27 mars 2017, par WHOAMI

  from ffmpy import FFmpeg
  import ffmpy
  
  ff = FFmpeg(inputs={'screenrecord.mp4':None},
              outputs={'C:\\Users\pc\Desktop\CM\03.24\Demo\output.mp4':None})
  
  #ff.cmd
  ff.run()
  

  following is the error message.

  C:\Users\pc\AppData\Local\Programs\Python\Python36\python.exe C:/Users/pc/Desktop/CM/03.24/Demo/Demo.py
  Traceback (most recent call last):
    File "C:\Users\pc\AppData\Local\Programs\Python\Python36\lib\site-packages\ffmpy-0.2.2-py3.6.egg\ffmpy.py", line 95, in run
    File "C:\Users\pc\AppData\Local\Programs\Python\Python36\lib\subprocess.py", line 707, in __init__
      restore_signals, start_new_session)
    File "C:\Users\pc\AppData\Local\Programs\Python\Python36\lib\subprocess.py", line 990, in _execute_child
      startupinfo)
  FileNotFoundError: [WinError 2] 系统找不到指定的文件。
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "C:/Users/pc/Desktop/CM/03.24/Demo/Demo.py", line 8, in 
      ff.run()
    File "C:\Users\pc\AppData\Local\Programs\Python\Python36\lib\site-packages\ffmpy-0.2.2-py3.6.egg\ffmpy.py", line 99, in run
  ffmpy.FFExecutableNotFoundError: Executable 'ffmpeg' not found
  

  Process finished with exit code 1