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

[Nico Sabbi]

Michael Niedermayer wrote:

>Hi
>
>On Monday 26 April 2004 21:10, Nico Sabbi wrote:
>  
>
>>Andriy N. Gritsenko wrote:
>>    
>>
>>>   Hi, Nico Sabbi!
>>>
>>>Sometime (on Monday, April 26 at 19:49) I've received something...
>>>
>>>      
>>>
>>>>>>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
>>>>        
>>>>
>>>   Which ones exactly?
>>>      
>>>
>>CSPS, packet_rate_restriction, system_video_lock, pstd_buffer_size_bound
>>maybe no programs ever uses these fields, but setting them correctly
>>(considering
>>that lavc doesn't follow any bitrate/buffer constraint)  doesn't hurt
>>    
>>
>lavc tries to follow what u specify, see TFM, allthough lavc is not perfect at 
>CBR, and CBR is not default
>
>btw, improving CBR and ratecontrol in lavc is near the top of my todo list 
>
>[...]
>  
>

mine is not a critic: I like lavc, I use it everyday for archiving; 
(setting vqmin=l:min=1 and
vqmax=4 often averages to 2Mb/s,
and the quality is really very good encoding to mpeg2 if the source is 
clean).
BTW there are problems with buffer underruns when you set vbv=1835.

If you need I'll prepare some test clip when I have some time.