Re: [gentoo-user] libav and ffmpeg on the same computer issue once again

[Alan McKinnon <alan.mckinnon@gmail.com>]

On 16/05/2015 07:52, gevisz wrote:
> 2015-05-15 20:30 GMT+03:00 Alexander Kapshuk <alexander.kapshuk@gmail.com>:
>> On Fri, May 15, 2015 at 9:04 AM, Gevisz <gevisz@gmail.com> wrote:
>>>
>>> On Fri, 15 May 2015 01:45:35 -0400 Gregory Woodbury <redwolfe@gmail.com>
>>> wrote:
>>>
>>>> I had a similar problem with some packages wanting virtual/ffmpeg  and
>>>> it wouldn't take the -libav USE flag without adding a keyword for
>>>> ~amd64 on the virtual.
>>>> (yes, I am going the opposite way from you, but the cause seem the
>>>> same -- various USE flags are not yet adjusted in the stable
>>>> branches.)
>>>>
>>>> Perhaps we need to request "stabilization" for some of the newer
>>>> packages to solve this.
>>>
>>> Thank you for confirming that libav USE flag do not work not only for me.
>>>
>>> However, it would be interesting to hear what the Gentoo devs think about
>>> this issue.
>>
>> Portage news item No 19 has the answer you're looking for.
> 
> No, it has not.
> 
> As I have already written, I have libav USE flag in my /etc/portage/make.conf
> and still portage wants to merge media-video/ffmpeg
> 
>>> eselect news read 19
>>> 2015-04-16-ffmpeg-default
>>>   Title                     FFmpeg default
>>>   Author                    Ben de Groot <yngwin@gentoo.org>
>>>   Posted                    2015-04-16
>>>   Revision                  1
>>>
>>> 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.
>>>
>>> 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.
> 
> P.S. Trying to find out which packages currently depend on ffmpeg,
>        I get the following:
> 
> $ equery depends ffmpeg
>  * These packages depend on ffmpeg:
> app-misc/tracker-1.2.5 (ffmpeg ? >=virtual/ffmpeg-9)
> media-libs/gegl-0.2.0-r2 (!libav ? media-video/ffmpeg:0)
> media-plugins/alsa-plugins-1.0.28 (ffmpeg ?
> virtual/ffmpeg[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?])
> media-plugins/gst-plugins-ffmpeg-0.10.13_p201211-r3 (!libav ?
>> =media-video/ffmpeg-1.2.6-r1:0[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?])
> media-plugins/gst-plugins-libav-1.2.4-r1 (!libav ?
>> =media-video/ffmpeg-1.2.6-r1:0[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?])
> media-sound/sox-14.4.1 (ffmpeg ? >=virtual/ffmpeg-0.9)
> media-video/vlc-2.1.5-r1 (!libav ? media-video/ffmpeg:0)
>                          (!libav ? >=media-video/ffmpeg-1.2:0)
>                          (!libav ? media-video/ffmpeg:0[vaapi])
> virtual/ffmpeg-9-r1
> (>=media-video/ffmpeg-1.2.6-r1:0[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?,X?,encode?,gsm?,jpeg2k?,mp3?,opus?,sdl?,speex?,theora?,threads?,truetype?,vaapi?,vdpau?,x264?])
> 
> Interestingly enouth, when I try to find out why the tracker package
> needs ffmpeg,
> I get the following:
> 
> $ equery uses tracker
> [ Legend : U - final flag setting for installation]
> [        : I - package is installed with flag     ]
> [ Colors : set, unset                             ]
>  * Found these USE flags for app-misc/tracker-1.2.5:
>  U I
>  - - cue               : Enable cue sheet parsing
>  + + exif              : Add support for reading EXIF headers from
> JPEG and TIFF images
>  - - ffmpeg            : Enable ffmpeg/libav-based audio/video codec support
>  - - firefox-bookmarks : Install bookmark data miner plugin for
> www-client/firefox and www-client/firefox-bin
>  + + flac              : Add support for FLAC: Free Lossless Audio Codec
>  + + gif               : Add GIF image support
>  - - gsf               : Enable gnome-extra/libgsf based data
> extractor and for ODT.
>  + + gstreamer         : Add support for media-libs/gstreamer (Streaming media)
>  + + gtk               : Add support for x11-libs/gtk+ (The GIMP Toolkit)
>  - - iptc              : Enable extraction of IPTC data from pictures
>  + + iso               : Enable extraction of metadata from ISO disk images
>  + + jpeg              : Add JPEG image support
>  + + miner-fs          : Enable tracker-miner-fs (required for
> filesystem indexing)
>  + + mp3               : Add support for reading mp3 files
>  + + nautilus          : Enable tracker to integrate with
> gnome-base/nautilus by providing entries in its context menu
>  - - networkmanager    : Enable net-misc/networkmanager support
>  + + pdf               : Add general support for PDF (Portable
> Document Format), this replaces the pdflib and cpdflib flags
>  - - playlist          : Add support for playlists
>  - - rss               : Enable support for RSS feeds
>  - - test              : Workaround to pull in packages needed to run
> with FEATURES=test. Portage-2.1.2 handles this internally, so don't
> set it in
>                          make.conf/package.use anymore
>  - - thunderbird       : Install email data miner plugin for
> mail-client/thunderbird and mail-client/thunderbird-bin
>  + + tiff              : Add support for the TIFF image format
>  - - upnp-av           : Enable UPnP audio/video streaming support
>  + + upower            : Enable power management support
>  + + vorbis            : Add support for the OggVorbis audio codec
>  + + xml               : Add support for XML files
>  - - xmp               : Enable support for Extensible Metadata
> Platform (Adobe XMP)
>  - - xps               : Add support for XPS file format through
> app-text/libgxps.
> 
> 
> That, in my view, means that the tracker package really should not
> demand ffmpeg.
> 


Just checking something.

app-misc/tracker does NOT depends on ffmpeg. It depends on
virtual/ffmpeg, which libav satisfies. I think you are chasing a red
haerring with that one.

Did you notice?


-- 
Alan McKinnon
alan.mckinnon@gmail.com