bool is_sane_fps(AVRational time_base);
AVRational fix_time_base(AVRational time_base);
+std::shared_ptr<AVFrame> flush();
+
double read_fps(AVFormatContext& context, double fail_value);
boost::rational<int> read_framerate(AVFormatContext& context, const boost::rational<int>& fail_value);
bool is_valid_file(const std::wstring& filename, bool only_video);
bool try_get_duration(const std::wstring filename, std::int64_t& duration, boost::rational<std::int64_t>& time_base);
-core::audio_channel_layout get_audio_channel_layout(const AVCodecContext& codec_context, const std::wstring& channel_layout_spec);
+core::audio_channel_layout get_audio_channel_layout(int num_channels, std::uint64_t layout, const std::wstring& channel_layout_spec);
// av_get_default_channel_layout does not work for layouts not predefined in ffmpeg. This is needed to support > 8 channels.
std::int64_t create_channel_layout_bitmask(int num_channels);