• 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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