How to change framerate in REALTIME when video is PLAYING?

[Stefan Kost]

On 07/10/11 23:12, Tom wrote:
> Hi Andrey,
>
> I followed your example and it works for me.
> I added gst_element_set_state(pipe,GST_STATE_NULL); before changing
> framerate, and also added
> gst_element_set_state(pipe,GST_STATE_PLAYING); after changing
> framerate. This changed the framerate.
>
> But another problem came by: The video window closed and re-opened at
> the moment of framerate changing.
You will want to manage your own window in the long-run and now rely on
gst's fallback window. Have a look at the gstxoverlay docs.

Stefan

> I want to make the window stay there and ONLY the videoframe change.
>
> Is there some way to make the video window never close while changing
> framerate?
> Thanks!
>
> Tom
>
>
>
> On Sun, Jul 10, 2011 at 4:21 AM, Andrey Nechypurenko
> <andreynech at googlemail.com <mailto:andreynech at googlemail.com>> wrote:
>
>     Hi Tom,
>
>     >
>     existed...http://gitorious.org/veter/veter/blobs/master/src/vehicle/VideoSenderThread.cpp#line264
>     > Could you please give me another example about adjusting the
>     caps filter?
>
>     Last couple of months I was working on the project rather active and
>     re-organize the source tree quite a bit.
>     Please try the following link:
>     https://www.gitorious.org/veter/vehicle/blobs/master/src/VideoSenderThread.cpp#line253
>
>     Regards,
>     Andrey.
>     ----------------------------------------
>     Blog: http://veter-project.blogspot.com
>
>
>     > Thank you very much!
>     >
>     > Tom
>     >
>     > On Thu, Mar 10, 2011 at 2:58 AM, Andrey Nechypurenko
>     > <andreynech at googlemail.com <mailto:andreynech at googlemail.com>>
>     wrote:
>     >>
>     >> Hi Tom,
>     >>
>     >> > I use
>     >> > gst-launch filesrc "location=video/1.MPG" ! decodebin !
>     videorate !
>     >> > video/x-raw-yuv, width=640,height=480,framerate=25/1 !
>     ffmpegcolorspace
>     >> > !
>     >> > jpegenc ! multipartmux ! tcpserversink host=192.168.2.1
>     port=$portNumber
>     >> > to stream a video and can change the video frame rate in this
>     way.
>     >> > But in this way the frame rate is fixed (i.e., framerate=25/1
>     here).
>     >> >
>     >> > I want to change the framerate in REALTIME when video is
>     PLAYING  ---
>     >> > during the streaming of this video, I can change the
>     framerate anytime I
>     >> > want.
>     >>
>     >> Then you need to modify the pipeline from your application. In
>     >> particular, you need to adjust the caps filter. Here you can
>     find an
>     >> example how to do it:
>     >>
>     >>
>     http://gitorious.org/veter/veter/blobs/master/src/vehicle/VideoSenderThread.cpp#line264
>     >> It changes width and height property of the named (qos-caps) caps
>     >> filter by pausing the videoscale element in front of it, updating
>     >> width and height properties and then un-pausing the videoscale.
>     So in
>     >> your case you can update the framerate property. However, as Kapil
>     >> pointed out to work properly, the downstream elements should be
>     able
>     >> to re-negotiate the new format.
>     >>
>     >> HTH,
>     >> Andrey.
>     >> _______________________________________________
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>     >
>     >
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