[MPlayer-users] RE : Re: Creating animated gif thumbnails of movies

[Mario Valle]

info at danielerossi.net wrote:
>> So, if your video is 30 fps and you use -vo gif89a:fps=1.0, then every
>> 30th frame will be output into the GIF.  AFAIK, framestep should not
>> be needed.
>>   
>> --Joey
>>     
> on my system the command
> mplayer file.ext -vo gif89a:fps=1.0:output=file.gif
> works and produce a 1framepersecond-gif.
> Only problem the color depth!
> is there a way to play around with color depth and frame duration?
>
> For example in my file the color depth is supposed to be rgb24 but the 
> quality in no more than a 8bit color depth.
> As a proof, if I ask a description from mplayer (snipped):
> VIDEO:  [.RGB]  480x640  8bpp  5.000 fps    0.0 kbps ( 0.0 kbyte/s)
>
> and a description from ffmpeg (snipped):
> Stream #0.0: Video: gif, pal8, 480x640, 25.00 fps(r)
>
> Playing around with "-vf format=..." like
>  -vf format=yv12,scale
>  -vf format=rgb24
> do not help.
> Daniele
>
> Full output of command:
>
> D:\cd 27>mplayer MVI_5703.avi.xvd.avi  -nosound -vo gif89a:fps=1.0:ou
> tput=test.gif
> MPlayer Sherpya-SVN-r23404-4.2.0 (C) 2000-2007 MPlayer Team
> CPU: Intel(R) Pentium(R) M processor 1.73GHz (Family: 6, Model: 13, 
> Stepping: 8)
>
> SSE2 supported but disabled
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
> Compiled for x86 CPU with extensions: MMX MMX2 SSE
>
> Playing MVI_5703.avi.xvd.avi.
> AVI file format detected.
> [aviheader] Video stream found, -vid 0
> [aviheader] Audio stream found, -aid 1
> VIDEO:  [XVID]  480x640  12bpp  30.000 fps  1566.1 kbps (191.2 kbyte/s)
> Clip info:
>  Software: MEncoder Sherpya-SVN-r23404-4.2.0
> ==========================================================================
> 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 - 480 x 640 (preferred colorspace: Planar YV12)
> Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 0.75:1 - prescaling to correct movie aspect.
> [swscaler @ 00CD71E0]No accelerated colorspace conversion found
> [swscaler @ 00CD71E0]SwScaler: using unscaled yuv420p -> rgb24 special 
> converter
>
> VO: [gif89a] 480x640 => 480x640 RGB 24-bit
>
> Exiting... (End of file)
>
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>   
GIF provides only 256 colors.

             mario

-- 
Ing. Mario Valle
Visualization Group                              | http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS)      | Tel:  +41 (91) 610.82.60
v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax:  +41 (91) 610.82.82