Video coder Acronims

Input #0, mpegts, from 'udp://239.1.1.43:2222':

  Duration: N/A, start: 60644.791400, bitrate: 15192 kb/s

  Program 1

    Stream #0.0[0x3e9]: Video: mpeg2video (Main), yuv420p, 704x576 [PAR 12:11 DAR 4:3], 15000 kb/s, 29.09 fps, 25 tbr, 90k tbn, 50 tbc

    Stream #0.1[0x3ea](rus): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (clean effects)

[buffer @ 0x5377ed0] w:704 h:576 pixfmt:yuv420p

[mpegts @ 0x5320a80] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt every 40 pkts

Output #0, mpegts, to 'udp://239.1.1.43:3333?pkt_size=1316':

  Metadata:

    encoder         : Lavf52.108.0

    Stream #0.0: Video: mpeg2video, yuv420p, 704x576 [PAR 12:11 DAR 4:3], q=2-31, 1500 kb/s, 90k tbn, 29.97 tbc

    Stream #0.1(rus): Audio: mp2, 48000 Hz, stereo, 192 kb/s (clean effects)

[PAR 12:11 DAR 4:3] Pixel aspect ratio (often abbreviated PAR)  Display Aspect Ratio (DAR) – the aspect ratio of the image as displayed http://en.wikipedia.org/wiki/Pixel_aspect_ratio

Well it's all about time. FFMpeg uses in fact three different timestamps in different bases in order to work.

• 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