[Ffmpeg-devel-old] Re: [Ffmpeg-devel] Some tweaks to better respect max bitrate

[Michael Niedermayer]

Hi

On Sat, Dec 24, 2005 at 08:56:01AM +0000, Mean wrote:
> Michael Niedermayer wrote:
> >ok, i tried this patch, it lowers PSNR by 0.06 increases filesize and 
> >doesnt
> >get rid of a single buffer underflow (12 before 12 after this patch)
> >
> >rejected
> >
> >command line used 
> >ffmpeg -i ~/videos/xXx_DivX.avi -cmp 2 -subcmp 2 -mbd 2 -an -pass 2 -b 300 
> >-maxrate 400 -bufsize 60 -psnr test2.avi
> >
> >  
> 
> Hello,
>    on typical SVCD type video it helped a bit, but without the "look in 
> the future" part it is not enough
> to get rid of the underflows, because in case a large intra comes in, it 
> is too late to compensate.
> 
>   The "look ahead" part is used in a slightly modified xvid ratecontrol 
> engine which glued to libavcodec
> mpeg2 encoder works mostly (not 100 % perfect but much much better).

if you ported the xvid rc code to lavc, why not send a patch (with the code
under CONFIG_GPL)?

[...]
-- 
Michael