读取视频基本流程
1. 创建avformat上下文<br>ifmt_ctx = avformat_alloc_context();
2. 打开视频文件<br>avformat_open_input(&ifmt_ctx, in_filename, 0, 0);
3. 持续读取视频帧<br>while (...) {<br> av_read_frame(ifmt_ctx, &pkt);<br> ...<br>}
4. 关闭avformat上下文<br>avformat_close_input(&ifmt_ctx);
输出视频基本流程
1. 创建输出上下文<br>avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);<br>
<span style="font-size: inherit;">2. 写格式头部<br></span>avformat_write_header(ofmt_ctx, NULL);<br>
3. 持续输出帧<br>while (...) {<br> av_interleaved_write_frame(ofmt_ctx, &pkt);<br> ...<br>}<br>
4. 写格式尾部<br>av_write_trailer(ofmt_ctx);
5. 关闭上下文<br>avformat_free_context(ofmt_ctx);
Muxer接口<br>AVOutputFormat
name
avformat_write_header()
av_write_packet()
av_write_trailer()
av_interleave_packet()
av_write_uncoded_frame()
常用方法
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()
Demuxer接口<br>AVInputFormat<br>
name
priv_data
av_read_probe()
av_read_packet()
av_read_seek()
av_read_close()
