Re: [gentoo-dev] RFC News item: FFmpeg default

[Michał Górny]

Dnia 2015-04-06, o godz. 14:10:12
Ben de Groot <yngwin@g.o> napisał(a):

> On 30 March 2015 at 00:23, Michał Górny <mgorny@g.o> wrote:
> > Dnia 2015-03-30, o godz. 00:07:16
> >
> > Include example code.
> >
>
> Updated version:
>
> Title: FFmpeg default
> Author: Ben de Groot <yngwin@g.o>
> Content-Type: text/plain
> Posted: 2015-04-07
> Revision: 1
> News-Item-Format: 1.0
> Display-If-Installed: media-video/ffmpeg
> Display-If-Installed: media-video/libav
>
> Since the choice between ffmpeg and libav has been made more
> explicit, there has been a lot of discussion about what the
> default implementation should be. It can be concluded that
> media-video/ffmpeg has wider support, and would be somewhat
> more convenient for most end-users.
>
> For this reason the default implementation has been switched
> back from media-video/libav to media-video/ffmpeg by removing
> the libav useflag from the base profile.

'Switched back' is suggesting there was some 'unintentional' switch
from ffmpeg to libav. Keep this free of politics, and just 'switched'.

> If the libav useflag is already globally enabled or disabled
> in /etc/portage/make.conf, then no further action is required.
>
> Users who implicitly relied on libav being enabled in their
> profile, and who wish to continue using libav, should enable
> USE=libav in their /etc/portage/make.conf file.
>
> > Also please prepare an update to the USE=libav news item to state
> > updated default.
>
> Diff:
>
> --- /var/portage/metadata/news/2015-02-01-use-libav/2015-02-01-use-libav.en.txt
> 2015-02-04 05:31:20.000000000 +0800
> +++ /home/ben/tmp/2015-02-01-use-libav.en.txt   2015-04-06
> 14:05:56.982039939 +0800
> @@ -2,7 +2,7 @@
>  Author: Michał Górny <mgorny@g.o>
>  Content-Type: text/plain
>  Posted: 2015-02-01
> -Revision: 1
> +Revision: 2
>  News-Item-Format: 1.0
>  Display-If-Installed: media-video/ffmpeg
>  Display-If-Installed: media-video/libav
> @@ -20,17 +20,17 @@
>  However, whenever appropriate additional USE=libav will be introduced to
>  control the preference of one implementation over the other.
>
> -Users who currently use libav (the Gentoo default) do not have to
> -perform any action since USE=libav is enabled by default. It should be
> -noted that the users still need to enable USE=ffmpeg on packages with
> -optional libav support as well. Users who want to use ffmpeg instead
> -need to specify USE=-libav in make.conf explicitly.
> +Users who currently use libav need to enable USE=libav in
> +/etc/portage/make.conf. It should be noted that users still need to
> +enable USE=ffmpeg on packages with optional libav support as well.
> +Users who currently use ffmpeg need to take no action.
>
>  Please also note that some packages support only one of the two
>  implementations. An attempt to install one of those packages may result
>  in blockers requiring the user changes the global USE=libav state.
>  The most notable example of such package is media-video/mplayer.
> -media-video/mpv may be used as a replacement for users who prefer libav.
> +media-video/mpv may be used as a replacement for users who prefer libav,
> +even though upstream mpv developers recommend using ffmpeg.

This is off-topic, and strongly biased.

>  Please do not alter the state of 'libav' flag on a per-package basis
>  (e.g. via package.use). The flag needs to be set globally to have

FYI: since Council's meeting in one week, I have added this to
the agenda. I'm really concerned about Gentoo's PR when users suffer
due to developers ping-ponging implementations/defaults.

-- 
Best regards,
Michał Górny