[MEncoder-users] Re: Re: new doom9 codec comparission (submission)

Rich Felker dalias at aerifal.cx
Sun Dec 18 23:05:48 CET 2005

On Sun, Dec 18, 2005 at 09:57:44PM +0100, Doom9 Feedback Hotline wrote:
> >mplayer ~/mpc2/samsung_t20/home/michael/videos/310058.avi -lavdopts 
> >idct=14 -vo md5sum
> >mplayer ~/mpc2/samsung_t20/home/michael/videos/310058.avi -vc xvid -vo 
> >md5sum
> >310058.avi uses mpeg_quant, qpel and gmc
> >md5s match so theres no difference between lavc and xvid decoders
> For your viewing pleasure, 3 screenshots from the comparison source, one 
> taken with the xvid dshow filter, two with theffdshow dshow filter, one 
> time the decoder set to xvid and once to libavcodec. Blow it up and you can 
> see they are different.Needless to say that I initially spotted the 
> difference when watching the video.. those shots just prove my point to 
> peoplewho do not trust my eyes. Here's the link 
> http://forum.doom9.org/sampleshots.zip
> All shots taken with deblocking turned on all the way, and no deringing. 

Of course if you're using different postprocessing the output will be
different.... What Michael is asking for is a comparison of the
decoders, not the postprocessing.

> You may even use the code of xvidcore for decoding, the problem is that the 
> dshow filter doesn't use that code.. thus unless libavcodec incorporates 
> the code from the XviD DS Filter, including the deblocking from that 
> filter, the output is never going to look the same.

That's not what he's trying to make the same..


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