[Bug 739968] v4l2src outputs bogus DTS

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739968
  GStreamer | gst-plugins-good | git

Nicolas Dufresne (stormer) <nicolas.dufresne> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas.dufresne at collabora.
                   |                            |co.uk

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2014-11-11 15:21:52 UTC ---
Hmm, that's bad from basesrc, I always thought the DTS was to be set as NONE,
which would be the correct value. DTS=PTS would be incorrect as you stated.

http://linuxtv.org/downloads/v4l-dvb-apis/buffer.html

According to the spec, from v4l2src point of view, the timestamp is the time
when the image was captured. Note, this is generally just an approximation, but
it clearly states that the driver can only give PTS. In presence of b-frames,
PTS will go forth an back, hence bad clock detection code will fail, and the
system (in dev branch only) vs wall clock detection may fail too. Few changes
seems needed.

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