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