Is the file in question AVC-in-AVI? Or does the same happen for MP4 too? Are there any known 'risky' x264 options? FAQ says Pyramid + Older decoder = doesn't work, but that should be fixed by now. Another report I read was about RDO + Exhausitive
http://forum.doom9.org/showthread.ph...780#post680780
Anyone knows any specific options in x264 that ffdshow doesn't like?