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

Michael Niedermayer michaelni at gmx.at
Sat Dec 17 19:54:38 CET 2005


On Sat, Dec 17, 2005 at 02:38:15PM +0300, Vladimir Mosgalin wrote:
> Hi Reimar D?ffinger!
>  On 2005.12.17 at 12:13:17 +0100, Reimar D?ffinger wrote next:
> > Btw. shouldn't it be possible to take on-the-frame screenshots with
> > something like (n is the frame number you want)
> > mplayer -nosound -benchmark -vo png -vf framestep=n
> > Maybe even add some -frames option so you really get only on picture.
> > No idea how precise the YUV->RGB colorspace conversion used by MPlayer
> > is. Does -vo jpeg have a lossless mode?
> No, unless it supports jpeg2000's lossless mode..

there are at least 3 lossless jpeg standards
lossless jpeg, jpeg ls and lossless jpeg 2000
IIRC jpeg ls has the best compression rate
AFAIK -vo jpeg doesnt support anything lossless
lavc supports lossless jpeg, and i had a half finished jpeg ls
implementation for lavc somewhere ...



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