[MPlayer-users] Produce 422 format pixels with mencoder for mpeg4-encoding

[Carl Eugen Hoyos]

James Board <jpboard2 <at> yahoo.com> writes:

> MPEG-4 AVC in this thread refers to MPEG-4 Part 10.

No, MPEG-4 AVC always refers to MPEG-4 Part 10 and 
since this is so confusing, everybody always calls 
it H.264. (I suspect I used another name in this 
thread but this was only because of your confusing 
question.)

> libx264 is one of the best AVC encoder available.

As said, this is not correct, different independent 
tests have shown that no matter how much money you 
spend, you will not get a better encoder.

> MPEG-4 ASP: is really MPEG-4 Part 2.

> This is the standard that is implemented by libav.

This sentence is extremely misleading.
"Among the >100 codecs implemented within FFmpeg, 
MPEG-4 ASP is one of them, FFmpeg provides both 
an encoder and a decoder. The encoder may be 
difficult to tune but is able to compete with 
the best encoders in class, the decoder supports 
many non-standard extensions."

And since you mentioned MEncoder in your email as 
if it had any relevance when encoding media files 
(and since other people may read this) allow me to 
repeat that MEncoder is not actively maintained and 
should only be used for specific tasks (of which 
you so far have not written in any of your emails), 
FFmpeg is an actively maintained applications that 
nowadays supports many filters that either don't 
exist for MEncoder or were improved when ported to 
FFmpeg.
(And concerning your current task: FFmpeg contains 
code that makes sure that no chroma samples get 
lost if the filter chains allow it as in your case.)

Carl Eugen