[FFmpeg-user] fps in March 13 git: -r 29.97 = 2997 tbn ???

[Leo Izen]

On Sat, Apr 2, 2011 at 7:50 AM, Mike Scheutzow <mjs973 at optonline.net> wrote:

>
>
>
> You misunderstand the meaning of tbn. tbn is not the "framerate" of the
> container, it is the timebase.
>
> A timebase is like a clock, and indicates ticks per second. Generally,
> higher values are better.
>
> Both values of tbn you saw should work fine for your file. You got
> different values because 29.97 is not *exactly* equal to 30000/1001.
>
> Also, be careful believing the tbn / tbc "Output #0" stats - they have been
> broken for months. Use 'ffmpeg -i infile' to get accurate values.
>


So tbn is timebase, but what is that exactly? Also, what are tbr and tbc?


>
> Mike Scheutzow
>
>
>
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