How to drop first X frames or first X seconds of video

[Angel Martin]

If you prefer the probe method this links could help you:
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-dataaccess.html
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-dynamic-pipelines.html

If you prefer a output-selector this one (ossbuild example):
http://code.google.com/p/ossbuild/source/browse/trunk/Main/GStreamer/Source/gst-plugins-bad/tests/icles/output-selector-test.c?r=926


2013/6/5 a b <genericgroupmail at gmail.com>

> Hi Angel,
>
> Thanks for the quick reply!
> So sounds like these methods are for programming a solution.
> I had planned to look into the python pygst module in order to get
> away from relying on executing system calls to gst-launch. Maybe now
> is the time to do that.
>
> Cheers!
>
>
> On Wed, Jun 5, 2013 at 12:52 PM, Angel Martin <amartin at vicomtech.org>
> wrote:
> > Hi,
> >
> > Check valve gst element or the probes to check the buffers timestamp to
> drop
> > or pass the buffer.
> >
> > Best,
> >
> > Angel
> >
> > 2013/6/5 a b <genericgroupmail at gmail.com>
> >>
> >> Hi all,
> >>
> >> I have an issue with capturing a single snapshot from one particular
> >> device.
> >> Very often when starting to stream from one of our capture cards using
> >> the decklinksrc element the first few seconds of video are badly
> >> tuned/rendered before things finally correct themselves and the video
> >> appears normal.
> >> The way in which i am taking a screen shot means that the first video
> >> frame is output to an image file, which for this device means a very
> >> poor snapshot.
> >> There is no issue with the v4l2src capture cards as the first frame is
> >> always perfectly tuned/rendered.
> >>
> >> Here is how i am doing it:
> >>
> >> gst-launch decklinksrc mode=2 connection=4 ! ffmpegcolorspace !
> >> video/x-raw-rgb ! pngenc snapshot=true ! filesink location="frame.png"
> >>
> >> Is there anyway or any element i can use to drop the first few seconds
> >> of video or the first e.g. 90 frames before taking the snapshot?
> >> I had read about the valve element and played with it but didn't see
> >> how it was going to work (for a start it causes execution to block).
> >> Ideally I'd like the command to run and finish with no further
> >> interaction as it does at the moment.
> >> If there is no real way to do it via a command line, then it would be
> >> useful if anyone could point to a way to do it programatically via
> >> python.
> >>
> >> Thanks in advance.
> >> _______________________________________________
> >> gstreamer-devel mailing list
> >> gstreamer-devel at lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
> >
> >
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> >
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