[MPlayer-users] How to force a special color space converter during encoding

[Daniel Lobo]

Hi all,

I'm having a problem with the color space trying to encode a raw video into
mpeg4.

The following command (full output at the end of this email):

mencoder -vc rawbgr24flip input.avi -ovc lavc -lavcopts vcodec=mpeg4
-nosound -o output.avi

prints: [swscaler @ 0335C550]using unscaled bgr24 -> yuv420p special
converter

and the colors in output.avi are not the same as the original, I suppose
because the multiple conversions between color spaces.

The following command:

mplayer input.avi

prints: [swscaler @ 0357C9F0]using unscaled bgr24 -> rgb32 special converter

but:

mplayer output.avi

prints: [swscaler @ 00FFEDF4]using unscaled yuv420p -> rgb32 special
converter


So my question is if there is a command-line arg to force a bgr24 -> rgb32
special converter during the encoding process in order to avoid those
unnecessary conversions.

Any help appreciated.

Daniel


mencoder -vc rawbgr24flip input.avi -ovc lavc -lavcopts vcodec=mpeg4
-nosound -o output.avi

MEncoder Sherpya-SVN-r28126-4.2.5 (C) 2000-2008 MPlayer Team
CPU: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz (Family: 6, Model: 15,
Step
ping: 11)
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

success: format: 0  data: 0x0 - 0x647e000
AVI file format detected.
[aviheader] Video stream found, -vid 0
VIDEO:  []  746x588  24bpp  25.000 fps  263424.0 kbps (32156.2 kbyte/s)
[V] filefmt:3  fourcc:0x0  size:746x588  fps:25.000  ftime:=0.0400
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Forced video codec: rawbgr24flip
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 @ 0335C550]using unscaled bgr24 -> yuv420p special converter
videocodec: libavcodec (746x588 fourcc=34504d46 [FMP4])
Selected video codec: [rawbgr24flip] vfm: raw (RAW BGR24)
==========================================================================
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing
vprp h
eader.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing
vprp h
eader.
Pos:   3.2s     80f (98%)  0.00fps Trem:   0min   0mb  A-V:0.000 [267:0]
Flushing video frames.
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing
vprp h
eader.

Video stream:  267.173 kbit/s  (33396 B/s)  size: 106869 bytes  3.200 secs
80 f
rames