[Matroska-devel] Question, avc units don't start with 0x000001 in matroska

[Steve Lhomme]

My bad, the codec in use *is* AVC. And there is no header compression
involved. That's as far as my knowledge of AVC goes. What is sure is
that no data is missing for playback as this file plays fine
everywhere.

On Sun, Oct 16, 2011 at 2:59 PM, Steve Lhomme <slhomme at matroska.org> wrote:
> The codec used is not AVC/H264. It's either Theora or "DivX".
>
> On Fri, Oct 14, 2011 at 8:31 PM, Makoto Oshita <12makoto28 at gmail.com> wrote:
>> Hi,
>>
>> I'm trying to decode test5.mkv in the test suite (
>> http://www.matroska.org/downloads/test_w1.html ).
>> However, the decoder which I'm using doesn't decode any pictures,
>> without any error, even how many samples I input into it.
>> I took a look into the file and realized its each sample starts with
>> something like 0x00 0x00 0x51 0xd0, my guess was each AVC sample
>> should start with 0x00 0x00 0x00 0x01.
>> I compared other files, .mkv and .mp4, both files comes from the same
>> content, I used a software called superC to make them, and checked
>> couple samples and confirmed those has the same samples except for
>> 4byte at the beggining of each sample as I mentioned above.
>> Those .mkvs don't have header stripping I believe.
>>
>> Am I missing something on leading bytes of avc samples? What does
>> those bytes mean more than delimiters?
>>
>> I'd appreciate if you could give some time for me, thanks!
>>
>> Makoto
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>>
>
>
>
> --
> Steve Lhomme
> Matroska association Chairman
>



-- 
Steve Lhomme
Matroska association Chairman