There are just too many options and provided by ffmpeg (with too briefly documented value ranges), I am losing track of which have any relation to Xvid at all, and which range of values is useful in case of Xvid as video encoder. And in case of a constant quantization possibly not at all.
there is the command line option "-trellis #", and because Xvid supports trellis quantization, encoding to MPEG4-ASP using libxvid probably uses Trellis if I add this option - but which (integer) parameter for this option would make sense? In case of Xvid possibly 0 and 1 in case of x264 possibly 0, 1 and 2. It seems to me that ffmpeg does not support codec specific options (like "-xvidencopts" in mencoder) but offers a lot of generic options instead, which may be supported by a specific codec or not. Which command line options of ffmpeg can I use / should I use for rather optimal results? yet?) and the audio with a constant quality as offered by LAME's VBR mode. To get rather optimal results, I'd try to have the video encoded with fixed quantizer (because Xvid does not really support a good "constant quality" algorithm like x264's CRF. Let's imagine I'd like to encode "anything" to MP4 with Xvid MPEG4-ASP video and LAME MP3 audio because that's quite the best size/quality ratio my mobile media player supports. offers a quite versatile and current build unfortunately there are so many options that I am hardly able to filter which of them are relevant for Xvid encoding with ffmpeg at all.
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