Question

我将视频流中的视频数据包写入缓冲区。然后我试图将它们写入档案。

            av_init_packet( &pkt );
            int bufer_size=250;

            while ( av_read_frame( ifcx, &pkt ) >= 0 && start_flag==0 && stop_flag==0){
                printf("reading packet - %i \n", pkg_index);
                if ( pkt.stream_index == i_index ) {
                    pkt.stream_index = ost->id;
                    pkt.pts = av_rescale_q_rnd(pkt.pts, ist->time_base, ost->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
                    pkt.dts = av_rescale_q_rnd(pkt.dts, ist->time_base, ost->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
                    pkt.duration = av_rescale_q(pkt.duration, ist->time_base, ost->time_base);
                    pkt.pos = -1;
                    av_copy_packet(&pkt_arr[pkg_index],&pkt);
                }
                av_free_packet( &pkt );
                av_init_packet( &pkt );
                pkg_index++;

                if(pkg_index>=bufer_size){

                    int ret = avformat_write_header(ofcx, NULL);
                    av_dump_format( ofcx, 0, ofcx->filename, 1 );

                        int i;
                        int start_frame=0;
                        for(i=start_frame; i<bufer_size; i++){
                            av_interleaved_write_frame( ofcx, &pkt_arr[i] );
                        }

                          av_write_trailer( ofcx );
                          avio_close( ofcx->pb );
                          printf("END \n");
                          return 0;

                }
            }

现在的问题是：如果start_frame = 0，即便可以，我有10秒的视频文件。但是如果start_frame = 125（例如）在resault我有视频文件，5秒冻结图片和5秒视频。

出了什么问题？

最后我也有错误：

[avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 1
[avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 2
[avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 3
[avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 4
[avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 5
[avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 6

也许你知道它是什么。

Answer 1

有点说你需要重新调整数据包pts / dts以进行+125帧更改。尝试在av_interleaved_write_frame之前重新调整pts / dts。对于pts，此简单公式可能有效pkt.pts = frame_count * pkt.duration。 dts更复杂，但对于测试用途，请尝试pkt.dts = pkt.pts。希望有所帮助。

C上的avcodec，冻结图像

1 个答案: