[Ffmpeg-devel] lowres
Michael Niedermayer
michaelni
Sat May 21 23:32:28 CEST 2005
Hi
On Saturday 21 May 2005 15:32, Roine Gustafsson wrote:
> "-lowres 1" seems broken in ffmpeg. It either produces a
> full-resolution frame with a incorrect lowres image in it, or breaks
> with segmentation fault in draw_edges_c. It doesn't seem to take in
> account that the resulting image will be smaller.
did it ever work better? if yes then when did it break?
>
> lowres does work in libavcodec - my own code works and mplayer works.
> Which codecs support lowres decode? Is h.264 supposed to work?
no
> Shouldn't there be some attribute you can query if a codec supports
> lowres or not?
>
> Also, I get quite alot of artifacts with lowres on high motion parts
> that touches edges (both in mplayer and in my code). Is this a known
> limitation of lowres or a bug?
did it work better in the past? if no then without further info i would say
its a limitation, which shouldnt mean its impossible to improve though ...
>
> Is CODEC_FLAG_EMU_EDGE a requirement for lowres?
yes
[...]
--
Michael
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