On 03/28/2010 04:02 AM, 7v5w7go9ub0o wrote: > On 03/27/10 21:17, Nikos Chantziaras wrote: >> On 03/28/2010 02:40 AM, 7v5w7go9ub0o wrote: >>> Some ffmpeg-using applications (e.g. mplayer) allow you to pass >>> numbers of threads (e.g. I use 6 on my Core-I7) to ffmpeg; others >>> (e.g. chromium) do not. >> >> First, mplayer uses its own bundled ffmpeg. It doesn't use >> media-video/ffmpeg at all. >> >> Furthermore, this is not what the "threads" USE flag does for >> ffmpeg. > > > > Thank you for replying!!! > > What would you guess the "threads" parameter is for ffmpeg? I've not > found an explanation, and thought it might be the author catching up > with Alexander Strange. > > <http://ffmpeg.org/ffmpeg-doc.html> The "normal" ffmpeg probably (just guessing here) uses threads for asynchronous i/o, buffering etc.. ffmpeg-mt includes a H.264 codec that decodes (and encodes?) HD videos with multiple threads. Maybe there are even more codecs that they have multithreaded, and probably a lot of infrastructure code had to be changed as well.
Bye, Daniel >> Those applications that allow you to specify an amount of threads >> assume you're using ffmpeg-mt instead of normal ffmpeg. ffmpeg-mt is >> a fork of ffmpeg and is not in Portage because it's still considered >> non-stable upstream. > >> There's an ebuild in Gentoo Bugzilla for ffmpeg-mt and an mplayer >> that uses ffmpeg-mt as its bundled ffmpeg version. The mt mplayer >> ebuild can also be found in the wirelay overlay (it's in layman.) > > AH! I had switched from bugzilla to the overlay for mplayer (thank you for > providing it); but was unaware that ffmpeg-mt had a separate ebuild. > Where is it, please? > > So the same question, then, for ffmpeg-mt; if I replace ffmpeg with > ffmpeg-mt after setting a default of 6, can you imagine any problems > (other than it is not stable)? > > Thanks for the help! > > -- PGP key @ http://pgpkeys.pca.dfn.de/pks/lookup?search=0xBB9D4887&op=get # gpg --recv-keys --keyserver hkp://subkeys.pgp.net 0xBB9D4887
signature.asc
Description: OpenPGP digital signature
