How can i make GStreamer appsink Receive FPS same like streaming video or rtsp stream?

Fri Feb 12 11:45:40 UTC 2021

My pipeline grabs frame from mp4 and save to callbacks register using
`g_signal_connect`

```
gst-launch-1.0 filesrc location=test.mp4 ! qtdemux !  h264parse !
v4l2h264dec ! capsfilter caps=video/x-raw,format=I420 ! appsink name=sink
```

Problem:
test.mp4 plays at 15FPS and i get frames by appsink at 7.5 FPS.
What changes can i make in pipeline to receive 15 FPS by appsink.

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