+ boost::shared_ptr<AudioBuffers> deinterleave_audio (boost::shared_ptr<FFmpegAudioStream> stream, uint8_t** data, int size);
+
+ std::list<ContentTimePeriod> image_subtitles_during (ContentTimePeriod, bool starting) const;
+ std::list<ContentTimePeriod> text_subtitles_during (ContentTimePeriod, bool starting) const;