public static extern AVRational av_guess_sample_aspect_ratio(AVFormatContext* format, AVStream* stream, AVFrame* frame);
 public static extern int avformat_match_stream_specifier(AVFormatContext* s, AVStream* st, String spec);
 public static extern int av_add_index_entry(AVStream* st, long pos, long timestamp, int size, int distance, int flags);
 public static extern int av_index_search_timestamp(AVStream* st, long timestamp, int flags);
 public static extern void av_pkt_dump_log2(void* avcl, int level, AVPacket* pkt, int dump_payload, AVStream* st);
 public static extern void av_pkt_dump2(void* f, AVPacket* pkt, int dump_payload, AVStream* st);
 public static extern void av_set_pts_info(AVStream* s, int pts_wrap_bits, int pts_num, int pts_den);