I managed to force the color space conversions. Using: mencoder -vc rawbgr24flip -vf scale,format=bgr24,scale input.avi -ovc lavc -lavcopts vcodec=mpeg4 -nosound -o output.avi prints: [swscaler @ 0335CA80]using unscaled bgr24 -> bgr24 special converter What seems to be good because "mplayer output.avi" prints: AVI file format detected. [aviheader] Video stream found, -vid 0 AVI: No audio stream found -> no sound. VIDEO: [FMP4] 746x588 24bpp 25.000 fps 267.2 kbps (32.6 kbyte/s) Clip info: Software: MEncoder Sherpya-SVN-r28126-4.2.5 ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4) ========================================================================== Audio: no sound Starting playback... VDec: vo config request - 746 x 588 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.27:1 - prescaling to correct movie aspect. VO: [directx] 746x588 => 746x588 Planar YV12 But it seems that mplayer is using yuv mode as final color space. The output video still have incorrect colors. With incorrect, i mean the same colors but dull. Avoiding the color space transformations does not seem to help. I have even tried with a lossless codec (ffv1) with the same results. The movie I'm trying to encode is a very simple synthetic image (a few lines, movie created with matlab) with pure saturated rgb colors. When encoded, the colors are not any more the pure saturated, but a little bit dull. Do you think that it is a problem with the encoding process or just a limitation of the codec used (tested mpeg4 and lossless ffv1)? Something strange: playing the input file with mplayer produces the original colors or the dull ones depending on the -vo option (the output file always have the dull colors): The command: mplayer -vo gl2 input.avi produces the good colors and prints: Opening video decoder: [raw] RAW Uncompressed Video VDec: vo config request - 746 x 588 (preferred colorspace: BGR 24-bit) VDec: using BGR 24-bit as output csp (no 0) Opening video filter: [flip] Movie-Aspect is undefined - no prescaling applied. Opening video filter: [expand] Expand: -1 x -1, -1 ; -1, osd: 0, aspect: 0.000000, round: 1 VO: [gl2] 746x588 => 746x588 BGR 24-bit [gl2] You have OpenGL >= 1.2 capable drivers, GOOD (16bpp and BGR is ok!) [gl2] antialiasing off [gl2] bilinear linear Selected video codec: [rawbgr24flip] vfm: raw (RAW BGR24) But the command: mplayer -vo directx input.avi produces the dull colors and prints: Opening video decoder: [raw] RAW Uncompressed Video VDec: vo config request - 746 x 588 (preferred colorspace: BGR 24-bit) Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] VDec: using BGR 24-bit as output csp (no 0) Opening video filter: [flip] Movie-Aspect is undefined - no prescaling applied. [swscaler @ 03582020]using unscaled bgr24 -> yuv420p special converter VO: [directx] 746x588 => 746x588 Planar YV12 Selected video codec: [rawbgr24flip] vfm: raw (RAW BGR24) So, I'm even more confused about the origin of the dull colors problem. Thanks you both for your help, Daniel On Sat, Apr 18, 2009 at 04:11, RC <cooleyr@xxxxxxxxx> wrote: > On Fri, 17 Apr 2009 14:44:49 +0200 > Daniel Lobo <dnlobo@xxxxxxxxx> wrote: > > > So my question is if there is a command-line arg to force a bgr24 -> > > rgb32 special converter during the encoding process > > Yes... Of course then the encoding process will fail miserably, because > just about every lossy video codec operates in a YUV mode. > > > in order to avoid those unnecessary conversions. > > The input needs to be converted. You can force it to use a different > chain of conversion steps, such as -vf scale,format=rgb32,scale > > The fact that mplayer is converting the color space is a bit unusual. > xv uses yuv format directly. What -vo method do you use? > > > > -- > Don't trust me! I'm wrong! > _______________________________________________ > MPlayer-users mailing list > MPlayer-users@xxxxxxxxxxxx > https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users > _______________________________________________ MPlayer-users mailing list MPlayer-users@xxxxxxxxxxxx https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users