将mp4文件读出的AVPacket包转化成annexb帧 AVBSFContext * h264bsfc; const AVBitStreamFilter * filter = av_bsf_get_by_name("h264_mp4toannexb"); ret = av_bsf_alloc(filter, &h264bsfc); avcodec_parameters_copy(h264bsfc->par_in, input_fmt_ctx->streams[video_stream_index]->codecpar); av_bsf_init(h264bsfc); AVPacket* packet = av_packet_alloc(); while( av_read_frame(format_ctx_, packet) >= 0 ) { if( packet.stream_index == video_stream_index ) { ret = av_bsf_send_packet(h264bsfc, packet); if(ret < 0) qDebug("av_bsf_send_packet error"); while ((ret = av_bsf_receive_packet(h264bsfc, packet)) == 0) { fwrite(packet->data, packet->size, 1, fp); } } av_packet_unref(packet); } av_packet_free(&packet); av_bsf_free(&h264bsfc);