output_dev.encode_audio || av_compare_ts(frame_pts, output_dev.video_st->enc->time_base, 4. frame_audio_pts, output_dev.audio_st->enc->time_base) <= 0)) //比较音频视频产生是的pts* time_base大小,以音频pts*times_base为基准,若视频的pts*time_base小于音频,则写入视频帧,否则写入音频...
There are three different time bases for time stamps in FFmpeg. The values printed are actually reciprocals of these, i.e. 1/tbr, 1/tbn and 1/tbc. tbn is the time base in AVStream that has come from the container, I think. It is used for all AVStream time stamps. tbc is the ti...
double sec = enc_pkt.pts *av_q2d(ofmt_ctx->streams[stream_index]->time_base); 【ffmpeg内部的时间戳与标准的时间转换方法】 timestamp(ffmpeg内部时间戳) =AV_TIME_BASE* time(秒)//其中 AV_TIME_BASE=1000000,其实就是将 单位 秒/s 转换成了 微秒/ustime(秒) =AV_TIME_BASE_Q* timestamp(f...
doublesec = enc_pkt.pts * av_q2d(ofmt_ctx->streams[stream_index]->time_base); 【ffmpeg内部的时间戳与标准的时间转换方法】 timestamp(ffmpeg内部时间戳) = AV_TIME_BASE *time(秒) time(秒)= AV_TIME_BASE_Q * timestamp(ffmpeg内部时间戳) 【当需要把视频Seek到N秒的时候】 //指定流索引int...
matroskaenc.c 可见 mux时，ffmpeg的输出 mkv的time_base为{1, 1000} TS格式的pts和dts单位是90000 。flv的时间戳单位为ms 。https://blog.csdn.net/zhuweigangzwg/article/details/64919706 https://www.jianshu.com/p/bf323cee3b8e https://blog.csdn.net/achang21/article/details...
av_q2d返回enc->time_base.num/ enc->time_base.den,即1/fps. 4、 将sync_ipts和ost->sync_opts进行求差。 double vdelta = sync_ipts - ost->sync_opts; 5、 根据vdelta来判断不同的情况。 l 情况一:Vdelta<-1.1,表示当前输入帧的播放时间在当前输出帧的前一帧之前,故舍弃该帧,nb_frames = 0...
转码过程的time_base 输入封装层time_base 输入编码层time_base 后续补充。 输出编码层time_base staticintinit_output_stream_encode(OutputStream*ost){...switch(enc_ctx->codec_type){caseAVMEDIA_TYPE_AUDIO:...// 采样率init_encoder_time_base(ost,av_make_q(1,enc_ctx->sample_rate));break;caseAV...
封装层的time_base image.png ffmpeg code TS mpegts.c中: avpriv_set_pts_info(st, 33, 1, 90000); mpegtsenc.c中 avpriv_set_pts_info(st, 33, 1, 90000); mp4 mov.c中 avpriv_set_pts_info(st,64,1,sc->time_scale); 其出处: ...
// Internal time base represented as integer #defineAV_TIME_BASE1000000 // Internal time base represented as fractional value #defineAV_TIME_BASE_Q(AVRational){1,AV_TIME_BASE} AV_TIME_BASE 及 AV_TIME_BASE_Q 用于 FFmpeg 内部函数处理,使用此时间基计算得到时间值表示的是微秒。
首先获取ost->frame_rate,然后计算enc_ctx->time_base = 1/ost->frame_rate。总结: AVStream->time_base比AVCodecContext->time_base精度要高(数值要小),比如AVStream->time_base为1/90000,而AVCodecContext->time_base为1/30(假设frame_rate为30);同样的pts和dts,以AVStream->time_base为单位,数值要比以...