ffmpeg解复用流程

与解复用有关的结构体

解复用流程

init_input(s, filename)的流程为：

MP4对应的AVFormatContext

AVInputFormat ff_mov_demuxer = {    .name           = "mov,mp4,m4a,3gp,3g2,mj2",    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime / MOV"),    .priv_class     = &mov_class,    .priv_data_size = sizeof(MOVContext),    .extensions     = "mov,mp4,m4a,3gp,3g2,mj2",    .read_probe     = mov_probe,    .read_header    = mov_read_header,    .read_packet    = mov_read_packet,    .read_close     = mov_read_close,    .read_seek      = mov_read_seek,    .flags          = AVFMT_NO_BYTE_SEEK,};