Hello, The libav project has served Sabayon well, and the fact it appeared and has been actively developed might have made great impact on the world of audio/video libraries. However, this may be a good time to switch back to ffmpeg. There are references on IRC that it's wanted by users because of projects that work only with ffmpeg.
I analysed it and concluded that there should be no big problems about the switch. Here is what I found out. I used 3.2.4 as target, which is the last stable version. No package should be lost after the switch. First of all, it seems that there are no "actual" packages in Gentoo tree that work with libav but not ffmpeg. (I took a simplistic approach for checking this, parsing in a way and comparing reverse dependencies listings from http://qa-reports.gentoo.org/, but it believe it was accurate.) Second, according to bug reports about incompatibilities with ffmpeg 3, packages that Sabayon provides with ffmpeg USE flag enabled have either patches (on BZ or at upstream) or new versions available that should correct the failure. Certainly, I didn't check that patches myself, so there is still a risk, but basing on the whole, it's negligible. It is also possible that a failure has not been reported. Comments on interesting cases I noted down are below. tracker bugs: https://bugs.gentoo.org/show_bug.cgi?id=574788 (ffmpeg-3) - [TRACKER] media-video/ffmpeg-3.0 transition https://bugs.gentoo.org/show_bug.cgi?id=575538 [TRACKER] media-video/ffmpeg-3.0 stabilization not listed above, so I'm listing it here (new version is available): https://bugs.gentoo.org/show_bug.cgi?id=609640 media-libs/xine-lib-1.2.6-r2 fails to compile after upgrading to media-video/ffmpeg-3.2.4 about to be removed from Gentoo: https://bugs.gentoo.org/show_bug.cgi?id=575824 app-cdr/backlite-1.0.3-r1 : src/.../k9avidecode.cpp:241: 33: error: ‘PIX_FMT_RGB24’ was not declared in this scope easy workaround is to disable this flag on ffmpeg (not much useful, no reverse dependency problems): https://bugs.gentoo.org/show_bug.cgi?id=598054 =media-video/ffmpeg-3.1.5 can't link properly when USE="jpeg2k" I can do the work. Due to a large number of packages to rebuild and the need to handle issues, if any, the work would be spread across a few days, perhaps up to about a week. Until finished, no other package related work could be done in Entropy (!), which means a short freeze. I could start at the end of this week, or even a little earlier, if nobody complains. Is there something I missed that makes the switch not possible?
