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  • Compression Techniques

    Convert ISOM(MP41) to MP42 with FFMPEG

    Posted by Donald Ortiz on September 13, 2011 at 9:24 pm

    Hi..

    Im having troubles streaming mp4 files.

    I have two files; the first one works perfect on streaming

    mp42: MP4 v2 [ISO 14496-14]
    – mp41: MP4 v1 [ISO 14496-1:ch13]

    The second one doesnt works on streaming

    isom: MP4 Base Media v1 [IS0 14496-12:2003]
    – iso2: MP4 Base Media v2 [ISO 14496-12:2005]
    – mp41: MP4 v1 [ISO 14496-1:ch13]

    MP42 WORKS GREAT ON STREAMING BUT MP41 DOESNT WORKS

    How can i convert mp41 to mp42 with ffmpeg?

    Thanks!

    Michael Rampe replied 14 years, 10 months ago 2 Members · 1 Reply
  • 1 Reply

  • Michael Rampe

    September 22, 2011 at 8:27 pm

    [Donald Ortiz] “How can i convert mp41 to mp42 with ffmpeg?”

    I had a look into this and found that it is an incompatible microsoft variant of mpeg4.

    FFmpeg supports these types:
    DEVSD msmpeg4 MPEG-4 part 2 Microsoft variant version 3
    D VSD msmpeg4v1 MPEG-4 part 2 Microsoft variant version 1
    DEVSD msmpeg4v2 MPEG-4 part 2 Microsoft variant version 2

    NOTE: the second one does not support encoding

    I tried msmpeg4v2 and it created an unplayable file for me… but I am on Mac….
    For mov, it reported:
    [mov @ 0x7fcd0204d800] Using MS style video codec tag, the file may be unplayable!
    For mp4 it failed:
    [mp4 @ 0x7fe35c04d800] track 0: could not find tag, codec not currently supported in container

    anyway, have a tinker and see if you can get the desired result….
    -vcodec msmpeg4v2

    Michael

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