[Matroska-users] question about MKV test suite

Steve Lhomme slhomme at matroska.org
Sat Jun 18 14:28:19 CEST 2011

Anyone ? I don't know much about codec details but surely some of you know ?

On Wed, Jun 8, 2011 at 12:12 PM, Cunsuo Guo <cunsuo.guo at gmail.com> wrote:
> Hi everybody,
> I'm currently working on a project related to MKV demux. But when I
> analyse the test1.mkv form the MKV test suite using AVI-Mux GUI, I
> found that the video data is not what I expected. The video CodecID of
> test file test1.mkv is V_MS/VFW/FOURCC, and AVI-Mux GUI shows that its
> FOURCC is MP42. Then the video data should be a MPEG4 stream, right?
> But the video data does not begin with 0x000001 (which all MPEG4 video
> stream begin with), instead it begins with 0x0978fe1f. I know the test
> suite must be OK, so there's must be something wrong with my
> understanding. Could you please let me know where I'm wrong? And I'm
> not familiar with V_MS/VFW/FOURCC, does it have something to do with
> the video data not beginning with 0x000001?
> Thanks for your time,
> Cunsuo
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Steve Lhomme
Matroska association Chairman

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