Corey Hickey wrote:
This appears to be an effect of the colorspace conversion from BGRA to YV12. -sws 8 appears to produce more even banding. You can try the different scalers yourself. For example:
$ mplayer gradient.avi -vf scale=720:480,format=yv12 -sws 8
-Corey
I've uploaded another PSD comparison to ftp://upload.mplayerhq.hu/MPlayer/incoming/ The file is called: rgb24_vs_rgb32.psd It seems as though the colorspace conversion is a part of the problem. If I use a rgb24 source (FFV1 file) instead of the rgb32 source, the colors are more accurate. I've broken the PSD file into several layers to show screenshots of the same gradient. If you look at all of the samples (rgb32 vs rgb24), the green in the upper left corner of the frame is much closer to the original in the rgb24 samples (perceptually, the colors are better everywhere in the rgb24 screenshots). A quick test with ffmpeg reveals that the same problem (inaccurate colors with rgb32 source) exists in ffmpeg. Is this a bug? If not, how can it be explained/fixed? Now, the secondary issues is the complexity of the banding. In all of the rgb32 screenshots, the banding is more complex (retains more detail??) than the rgb24 screenshots. Can I improve the complexity of the banding with the rgb24 source? Is this another symptom of the colorspace conversion??? Your help is much appreciated. Thanks!!!