[FFmpeg-devel] Question on tbr, tbn, tbc

[Kamaldeep Tumkur]

Thanks for the detailed answer. Needs no more clarifications. I will pursue
such questions on the user list.

Thanks

On Mon, Apr 13, 2015 at 7:09 PM, Jean First <jeanfirst at gmail.com> wrote:

> On Mon Apr 13 2015 15:30:03 GMT+0200 (CEST), Kamaldeep Tumkur wrote:
> > I have an mpeg4 transcoded from an mov source that has the following:
> >
> > Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661),
> > yuv420p(tv, bt709), 480x270 [SAR 1:1 DAR 16:9], 462 kb/s, 25 fps, 25 tbr,
> > 12800 tbn, 50 tbc (default)
> >
> > Why is tbn value so high? Why do the tbc and tbn values not match the
> tbr?
> > And what kind of irregularities can this potentially cause during
> playback?
> > How can it be corrected?
> >
> > When used in http based streaming with flash, this mp4 results in a black
> > screen right at start up that continues till the end. On seeking, the
> video
> > displays back again.
> >
> > Thanks for your inputs and guidance.
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> Hi,
>
> Please continue this conversation on the ffmpeg-user mailinglist !
>
> The default value is set so high so you can combine multiple streams
> with different timebases in the same container without having to worry
> for offsets. It should not cause any problems during playback. If you
> want to set it to a specific value during encoding you can set the
> video_track_timescale option to a specific value.
>
> Jean
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