[Libav-user] --disable-asm --disable-yasm options

Carl Eugen Hoyos cehoyos at ag.or.at
Mon Mar 25 22:36:50 CET 2013

Dolevo Jay <cmst at ...> writes:

> Do I lose a lot of decoding performance because 
> of --disable-yasm option?

If you are compiling for x86 (either 32 or 64bit), you 
should definitely compile with yasm for performance 
reasons. Many optimisations have been ported from 
inline assembly to yasm over the last years.
(yasm cannot be used when compiling for other hardware.)

--disable-asm is relevant for all (most) platforms, you 
should never use it except for debugging (as with 
--disable-yasm), if you have any problems when not using 
it, please report them either here or on trac.

Please understand the project is called "FFmpeg", find 
the current version at http://ffmpeg.org/download.html

Carl Eugen

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