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

[a b]

Thank you very much Angel,

Really appreciate your input on this!

On Wed, Jun 5, 2013 at 2:40 PM, Angel Martin <amartin at vicomtech.org> wrote:
> 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
>> >
>> >
>> >
>> > _______________________________________________
>> > gstreamer-devel mailing list
>> > gstreamer-devel at lists.freedesktop.org
>> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>> >
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>