AVFormatContext

1. 创建avformat上下文
ifmt_ctx = avformat_alloc_context();

2. 打开视频文件
avformat_open_input(&ifmt_ctx, in_filename, 0, 0);

3. 持续读取视频帧
while (...) {
  av_read_frame(ifmt_ctx, &pkt);
  ...
}

4. 关闭avformat上下文
avformat_close_input(&ifmt_ctx);

1. 创建输出上下文
avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);

2. 写格式头部
avformat_write_header(ofmt_ctx, NULL);

3. 持续输出帧
while (...) {
  av_interleaved_write_frame(ofmt_ctx, &pkt);
  ...
}

4. 写格式尾部
av_write_trailer(ofmt_ctx);

5. 关闭上下文
avformat_free_context(ofmt_ctx);

name

avformat_write_header()

av_write_packet()

av_write_trailer()

av_interleave_packet()

av_write_uncoded_frame()

iformat(demuxer)

oformat(muxer)

streams

video_codec

audio_codec

subtitle_codec

avformat_alloc_context()

avformat_alloc_output_context2()

av_dump_format()

avformat_open_input()

avformat_close_input()

avformat_find_stream_info()

av_read_frame()

avformat_write_header()

av_interleaved_write_frame()

av_write_uncoded_frame()

av_write_frame()

av_write_trailer()

name

priv_data

av_read_probe()

av_read_packet()

av_read_seek()

av_read_close()