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

[Makoto Oshita]

Hi Steve,

Thank you for your time.
Yea I understood this is an issue about more AVC than matroska.
I'll re-confirm that I'm passing all samples into decoder correctly.

Thanks,
Makoto

2011/10/17 Steve Lhomme <slhomme at matroska.org>:
> 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
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