- *tbn* = the time base in AVStream that has come from the container.
- *tbc* = the time base in AVCodecContext for the codec used for a
- *tbr* = *tbr* is guessed from the video stream and is the value users
want to see when they look for the video frame rate.
> In this ffmpeg output listing:
> Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, top first),
> 720x480 [SAR 32:27 DAR 16:9], Closed Captions, 29.97 fps, 29.97 tbr, 90k
> tbn, 59.94 tbc
> what does "tbr", "tbn", and "tbc" mean?
> I've searched the documentation but have not found Joy.
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