[FFmpeg-devel] [PATCH] Set generic yuv420 sampling in yuv4mpeg by default
Fri May 8 06:12:58 CEST 2009
On May 7, 2009, at 11:43 PM, David Conrad wrote:
> As discovered in #x264, the dump_psnr tool in Thusnelda actually
> cares about chroma sample positions. This should probably be more
> correct; I don't know for sure which codecs define which positioning.
Also I should mention that this is the reason x264 scored so badly on
the latest Thusnelda update. dump_psnr shifted x264's chroma a half
pixel left and this resulted in 4 db PSNR lost.
More information about the ffmpeg-devel