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

[Dave Rice]

> 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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