ffmpeg -i video.flv Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 704x576 [PAR 12:11 DAR 4:3], 9578 kb/s, 25 tbr, 90k tbn, 50 tbc
tbn = the time base in AVStream that has come from the container tbc = the time base in AVCodecContext for the codec used for a particular stream tbr = tbr is guessed from the video stream and is the value users want to see when they look for the video frame rate
1 if(st->codec->codec_type == CODEC_TYPE_VIDEO){ 2 if(st->r_frame_rate.den && st->r_frame_rate.num) 3 print_fps(av_q2d(st->r_frame_rate), "tbr"); 4 if(st->time_base.den && st->time_base.num) 5 print_fps(1/av_q2d(st->time_base), "tbn"); 6 if(st->codec->time_base.den && st->codec->time_base.num) 7 print_fps(1/av_q2d(st->codec->time_base), "tbc"); 8 }
ffmpeg 的 tbr tbc 和 tbn的意义,布布扣,bubuko.com
原文：http://www.cnblogs.com/youngt/p/3673409.html