ffmpeg-2.6 has dropped definitions in avformat.h which have been declared private, among these /* av_seek_frame() support */ int64_t data_offset; /**< offset of the first packet */ This breaks, e.g., media-video/bombono-dvd-1.2.2 and probably some more packages.
(In reply to Helmut Jarausch from comment #0) > ffmpeg-2.6 has dropped definitions in avformat.h which have been declared > private, > among these those were already private and not abi safe anyway + 11 Mar 2015; Alexis Ballier <aballier@gentoo.org> bombono-dvd-1.2.2.ebuild, + +files/bombono-dvd-1.2.2-ffmpeg26.patch: + fix build with ffmpeg 2.6, bug #542814 + thx for the report