[Bug 753562] v4l2src: Implemented timecode metadata

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753562

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
As I was not myself well aware of this API, I took the liberty to ask Hans
Verkuil about it. He explained that these time code are intended to be used for
codes found outside of the overscan area on SD-TV recording (mostly for
recorded tapes). This was use for synchronization when reusing these tapes in
post-production. In GStreamer, this is called "stream time", and with a rate of
1.0 and base time of 0, this should match the stream position. Doing this,
would effectively let GStreamer do what it's designed for, synchronize the
streams.

I also gathered Hans' opinion:
<hverkuil> Well, apparently nobody ever does, because there are no drivers that
actually use it.
<hverkuil> We've been wondering whether it should just be removed, or marked
deprecated or whatever.
<hverkuil> I wouldn't add support for it to gstreamer, unless someone has a
really good use-case.

So here we are, I'd like to know more about why you'd like to use this kernel
API.

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