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michael_weaver_
Inspiring
March 12, 2010
Question

Fragmented f4v files

  • March 12, 2010
  • 1 reply
  • 1497 views

Does anyone know if there is some kindof specification of the file format of a fragmented f4v file (ie. f4v file with moof atoms)?

I've got some h264 encoded fragmented mp4 files which work with a smooth streaming (silverlight) player and was hoping they would work with a flash player, with fms 3.5, by just renaming the file extension to f4v. Unfortunately they don't and I can't find any information regarding what atoms fms requires to play fragmented f4v files. This is a file format produced by the current version of Media Live Encoder 3. Also interestingly my fragmented mp4 pass tests run by flvcheck.

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    1 reply

    A
    Anonymous
    March 15, 2010

    Hi Michael

    Would it be possible for you to share a small sample MP4 file? As you say this file passes the tests done by FLVcheck tool, so having the sample file would help in checking what is happening here.

    Thanks

    Mamata

    M
    michael_weaver_Author
    Inspiring
    March 15, 2010

    Hi,

    I figured out what my problem was, it turns out I hadn't set the base data offset in the tfhd box to point at where the video stream starts. Smooth streaming allows this as instead it contains a mfra box at the end of the file which points to where the video stream starts. Now my fragmented mp4 file is playing fine

    A
    Anonymous
    March 15, 2010

    It's good to know the issue is resolved for you . Thanks for taking time out to mention the correction as well.

    If possible it would still help to have the small sample file which was giving problems while streaming on fms. I could check why the flvcheck tool showed it as valid.

    Thanks

    Mamata

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