How to change framerate in REALTIME when video is PLAYING?

[Andrey Nechypurenko]

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> 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.
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
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