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

[Steinar Apalnes]

I does not work. Besides, what would ":00" do? The TC need to be as
frame-accurate as possible, so we need to convert millisecond of the first
captured frame to frame. F.ex: 10:45:13:21 where 21 would be
(approximately) 840 ms after 10:45:13 at 25 fps.

-steinar

2018-06-06 17:43 GMT+02:00 Dave Rice <dave at dericed.com>:

>
> > On Jun 5, 2018, at 4:12 PM, Steinar Apalnes <steipal at gmail.com> wrote:
> >
> > 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.
>
> Perhaps add something like:
> -metadata "timecode=$(date +"%T:00")"
>
> > -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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