[FFmpeg-devel] [PATCH] Fix Raw rgb/bgr Vertical Flip in AviSynth

[Josh Harris]

On Sat, 21 Feb 2009 15:32:56 +0000 (15:32 +0000) a patch was committed:
"Fix raw rgb/bgr vertical flip in avi based on info from
fourcc.org/fccbihgt.php. partially fixes issue862."  This has broken RGB
input from Avisynth files, as they are now decoded upside down.  Taking
some code from libavformat/avidec.c and applying it to
libavformat/avisynth.c seems to fix the issue.

The problem can be demonstrated with the following (it will produce an
avi with the video flipped vertically):
ffmpeg -i bars.avs -vcodec rawvideo -pix_fmt bgr24 bars_bgr24.avi

bars.avs is a script with:
ColorBars(320,240).KillAudio().ConvertToRGB24().Trim(0,29)

A patch for libavformat/avisynth.c is attached.

Issue862 can be viewed here:
http://roundup.ffmpeg.org/roundup/ffmpeg/issue862

The original commit for issue862 can be viewed here:
http://git.ffmpeg.org/?p=ffmpeg;a=commit;h=cc20568d95771d82b3c19da1779c59d4d84cf6fb

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