On Sun, Mar 6, 2016 at 1:43 PM, Reimar Döffinger <reimar.doeffin...@gmx.de> wrote: > On Sun, Mar 06, 2016 at 07:35:58PM +0100, Reimar Döffinger wrote: >> Approximately 10% faster transcode from mp3 to aac >> with default settings. > > Note to anyone wanting to optimize it further: > There is almost 25% on the table if you can replace > the pow() and cos() function uses by something more > efficient.
So I did try one thing, namely in lavc/aacenc_utils, replace powf in find_form_factor by a conditional checking for 2.0f, squaring if it is, powf otherwise (see lavc/aaccoder_twoloop for the calls, one is with 2.0f, other without), but it yields essentially nothing. Likewise, an even more trivial one is line 125 of aaccoder_twoloop: powf can be replaced here by sqrtf(sqrtf()), but this also yields nothing. Can you be more specific, and are you sure about this? [...] _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
