Fix gapless playback support for MP1/2/3 audio
See individual commits from @dv1
Migrated from gst-plugins-good!344 (closed) and gst-libav!41 (closed) into a single MR.
See individual commits from @dv1
Migrated from gst-plugins-good!344 (closed) and gst-libav!41 (closed) into a single MR.