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Dnia 2015-01-26, o godz. 12:15:49 |
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Peter Stuge <peter@×××××.se> napisał(a): |
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> Michał Górny wrote: |
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> > Title: USE=libav introduction |
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> > Author: Micha?? G??rny <mgorny@g.o> |
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> |
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> Your mailer doesn't set charset for the .txt attachment. |
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NeedPatch :). |
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> > Content-Type: text/plain |
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> > Posted: 2015-01-yy |
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> > Revision: 1 |
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> > News-Item-Format: 1.0 |
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> > Display-If-Installed: media-video/ffmpeg |
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> > Display-If-Installed: media-video/libav |
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> > |
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> > The support for automatic choice between ffmpeg and libav is going to be |
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> > deprecated in favor of explicit choice via USE flags. This change aims |
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> > to solve multiple repeating issues, including Portage undesirably |
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> > wanting to replace one package with the other, subslot upgrade issues |
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> > and some of the hard-to-understand blocker issues. |
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> > |
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> > The current USE=ffmpeg will maintain its role of enabling optional |
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> > support for ffmpeg or a compatible implementation (libav) in a package. |
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> > However, whenever appropriate additional USE=libav will be introduced to |
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> > control the preference of libav over ffmpeg. |
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> > |
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> > Users who currently use libav (the Gentoo default) do not have to |
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> > perform any action since USE=libav is enabled by default. It should be |
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> > noted that those users will need to enable USE=ffmpeg on packages with |
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> > optional libav support as well. |
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> |
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> So far so good. |
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> |
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> > Users who want to use the ffmpeg fork instead need to specify USE=-libav |
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> > explicitly. |
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> |
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> "the ffmpeg fork" above is very confusing because libav is the ffmpeg |
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> fork, and I think what you mean here is simply "ffmpeg". I suggest: |
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Well, you aren't correct which of the two is actually the fork but I |
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can see the confusion. |
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> Users who want to use ffmpeg rather than libav where that is possible |
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> instead need to specify USE=-libav explicitly. |
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> |
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> |
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> > Please also note that some packages support only one of the two |
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> > implementations. An attempt to install one of those packages will result |
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> > in blockers unless the user changes the global USE=libav state. |
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> |
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> This isn't completely accurate.. It's enough to change USE=libav for |
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> the affected packages. I'm afraid I can't offer a wording suggestion |
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> on this one. :\ |
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But you have to do the change on all packages using ffmpeg/libav. Since |
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all packages have to have exactly the same state, I don't really see |
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a point in not setting this a global flag. |
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-- |
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Best regards, |
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Michał Górny |
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