[FFmpeg-user] Injecting clock based TC at first frame captured

[Steinar Apalnes]

Thanks for the reply! :-)

My request/question is not strictly related to decklink but capturing in
general; The ability to set the start tc when the first frame is captured
from any capture device. The method should not be depending on incoming tc
signals from external devices but rather rely on the PC clock to determine
the "exact" capture time of the first frame. If it's feasable.

-steinar

2018-06-05 21:47 GMT+02:00 Dave Rice <dave at dericed.com>:

>
> > On Jun 4, 2018, at 4:41 PM, Steinar Apalnes <steipal at gmail.com> wrote:
> >
> > Hi,
> >
> > I'm doing a lot of capturing through decklink video devices and I was
> > wondering if it was, or would be possible to make ffmpeg set a frame
> > accurate start TC based on wall clock when the first frame was captured?
> > An option like this maybe:
> >
> > -tc_inject 1
> >
> > Where 1 could be the first frame.
> >
> > or
> >
> > -tc_inject now
> > -timecode now
> >
> > Maybe this kind of option exist or maybe there are other good ways of
> > solving the "problem" but I have yet to find a solution.
>
> There is a patch regarding this under consideration on ffmpeg-devel. See
> http://ffmpeg.org/pipermail/ffmpeg-devel/2018-May/230500.html or subject
> line "[FFmpeg-devel] [PATCH] Limited timecode support for lavd/decklink".
> Best Regards,
> Dave Rice
>
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