[MPlayer-dev-eng] Re: divx2svcd-0.5.1

[Nico Sabbi]

Andriy N. Gritsenko wrote:

>    Hi, Nico Sabbi!
>
>Sometime (on Monday, April 26 at 12:06) I've received something...
>  
>
>>out of curiosity:  what draft did  you follow, 11722-1?
>>    
>>
>
>    Yes, almost this one, draft ISO number 11172. Is it bad?
>  
>

no, I just needed a reference

>  
>
>>I can't reconduce some of your pes headers to 13818-1.
>>    
>>
>
>    If I missed something, would you like to point me on document where I
>can find right info, please?
>
>  
>
>>A couple of hints, hoping you will turn them into patches :)
>>    
>>
>
>    Thank you. :)
>
>  
>
>>a) when the audio codec is ac3 (format 0x2000) you could use 
>>stream_id=0xbd, so demux_mpeg can correctly recognize ac3
>>(although maybe it's not enough:  IIRC there should be the extra 4 
>>leading bytes 0x....80 in the pes payload)
>>    
>>
>
>    I'll read specification again. It seems bad to force stream id to
>some fixed value - what if there will be another stream of that type?
>Anyway I don't remember that well now so I'll read specs.
>
>  
>

the sub-id should range from 0x80 to 0x8f (or 0x9f, I'm not sure); it's 
the format used by ac3 in dvds

>>b) it video is mpeg2 it would be nice to set  correctly the mpeg1_mpeg2 
>>bit, to make some programs like replex happy
>>    
>>
>
>    This may be good thing. Another thing may be changing default stream
>rate if stream is mpeg2.
>
>  
>

yes, and maybe disabling those  rate compliance flags in the system header

>>Do you have any idea why TMPG often stops demuxing mpeg files generated 
>>by mencoder long before the end?
>>    
>>
>
>    Hmm. Could you give me an example of such file? At least how it was
>generated to copy this behavior.
>
>  
>

almost any mpeg file with mpeg1video  will cause tmpg to break

>    With best wishes.
>    Andriy.
>
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>