GStreamer

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 http://bugzilla.gnome.org/show_bug.cgi?id=169383
 GStreamer | gst-plugins | Ver: 0.8.8





------- Additional Comments From Ronald Bultje  2005-03-06 10:01 -------
Quick hack: dv1394src ! queue leaky=1 ! { dvdec name=dec ! ... }

The correct approach is to have dv1394src provide a clock (and also to make it
work with foreign clocks). For timestamps, it could either parse packet headers
or query the downstream decoder. If the assigned clock != provided clock, we'll
need some interaction between source/decoder to make sure timestamps match the
actual clock.

Note that this would still have issues because sink/source clock matching is
sometimes painful. See bug #148609 for an example. That is a separate issue that
we need to solve as well.

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------- Additional Comments From Andrea Ferro  2005-03-06 11:20 -------
Yep. I've been thinking about that. But I was steered away when I checked the
clock on sdlvideosink and seen a null.

See Bug 169396: clock api broken by GstVideoSink

However there's more to it.
dvdec (and I suspect ffmpeg demuxing/decoding too) will ignore the timestamps
dv1394src provides and regenerate them.

This would become a problem in cases like a ieee1394 device that's intentionally
playing fast (jog control).

Not the issue I'm having now. But still something to think of.



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 GStreamer | gst-plugins | Ver: 0.8.8

Christian Schaller changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |WONTFIX



------- Additional Comments From Christian Schaller  2005-11-10 10:49 ---=
----
This issue is being addressed fully in 0.9/0.10 as part of planned work. =
The
chances for it getting fixed within 0.8 at this point is very small so I =
am
closing this bug.

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 GStreamer | gst-plugins | Ver: 0.8.8

Ronald Bultje changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
             Status|RESOLVED                    |NEW
      everconfirmed|0                           |1
         Resolution|WONTFIX                     |



------- Additional Comments From Ronald Bultje  2005-11-10 15:22 -------
This bug has not been adressed in 0.9 yet.

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 GStreamer | gst-plugins | Ver: 0.8.8


Wim Taymans changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
                 CC|                            |wim@...




------- Comment #5 from Wim Taymans  2006-01-12 11:37 UTC -------
dvsrc is live and should provide a clock. Since the clock is provided by =
a
source element, it will be prefered over the alsasink clock. Alsasink wil=
l
slave its clock to this clock and will adjust its rate to it.


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 GStreamer | gst-plugins-base | Ver: HEAD CVS


Andy Wingo changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
                 CC|                            |wingo@...
          Component|gst-plugins                 |gst-plugins-base
            Summary|gst sink clock vs external  |[dv1394src] gst sink clo=
ck
                   |device clock drifting       |vs external device clock
                   |                            |drifting
            Version|0.8.8                       |HEAD CVS




------- Comment #6 from Andy Wingo  2006-01-22 15:43 UTC -------
So to fix this bug in 0.10 one would do as Wim says, and make dv1394src p=
rovide
a clock. Updating the version.


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Wim Taymans changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
           Severity|enhancement                 |normal




------- Comment #7 from Wim Taymans  2006-03-29 16:12 UTC -------
this is not really an enhancement because without it, things just don't w=
ork
properly.


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Wim Taymans changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
         AssignedTo|gstreamer-                  |wim@...
                   |bugs@...  |
             Status|NEW                         |ASSIGNED




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 GStreamer | gst-plugins-base | Ver: HEAD CVS





------- Comment #8 from Wim Taymans  2006-04-14 15:19 UTC -------
disabling sync with the sync=3Dfalse option on the sinks will work around=
 the
problem and will make the sinks follow the rate of the source.


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Wim Taymans changed:

           What    |Removed                     |Added
-------------------------------------------------------------------------=
---
                 CC|                            |paul@...




------- Comment #9 from Wim Taymans  2006-06-01 11:46 UTC -------
*** Bug 343581 has been marked as a duplicate of this bug. ***


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  GStreamer | gst-plugins-good | Ver: git

Edward Hervey changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bilboed@...
             Status|ASSIGNED                    |NEEDINFO
          Component|gst-plugins-base            |gst-plugins-good




------- Comment #10 from Edward Hervey  2009-03-11 08:00 UTC -------
Andrea, does this still fail when using wim's instructions from #8 ?

Also, re-assigning to good (where dv1394src lives).


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------- Comment #11 from Andrea Ferro  2009-03-11 11:18 UTC -------
(In reply to comment #10)
> Andrea, does this still fail when using wim's instructions from #8 ?
> 
> Also, re-assigning to good (where dv1394src lives).
> 

Sorry Edward but the system I had developed was not a commercial product: it
was a multimedia installation that have lived for about an year and then it was
dismantled. Besides I'm no more doing SW development (now I'm doing technology
consulting for a movie producer and am more concerned with video production and
post production, than with video and media fruition). Therefore I'm no more in
the position to check this (maybe mere curiosity may someday push me into
trying some gstreamer pet project on a Mac, however).

Maybe someone that is currently working with gsteamer, has a firewire port and
has a DV camcorder could try it for you. I remember being able to see the
problem with the very simple chain in the OP. Even by setting it up with the
command line tool (sorry, do not remember what that's named, but you know what
I mean). Run it and then let it run for a few minutes: if the clocks are even a
little bit out the displayed image will noticeably lag behind after a while
(lag slowly but monotonically increasing over time).


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