[FFmpeg-devel] pixel format convertion yuv422p->yuv420p->yuv411p->yuv422p degrade picture
Tue Jul 15 17:22:33 CEST 2008
Maksym Veremeyenko wrote:
> Dear Developers!
> I was testing pixel format changing and found that convertions like:
> degrade picture - it become greener.
> To prove this i did a shell script, see attached. On 50th iteration
> picture is almost compleately green.
> Is it normal behaviour for pixel format converting or it is a bug?
Apparently, rounding errors in the chroma interpolation are accumulating.
Without thinking a little harder, I don't know whether such a conversion
sequence is possible without such drift. It will always be lossy, as I'm
sure you already realise.
mans at mansr.com
More information about the ffmpeg-devel