Screen recording to a file using gstreamer - speeding up video

I’m using the following pipeline for screen recording however when I play the video back, it seems to be sped up by a lot. How do I ensure that my recording is at the correct speed:

gst-launch-1.0 -v ximagesrc ! nvvidconv ! 'video/x-raw(memory:NVMM),alignment=au,format=I420,framerate=60/1,pixel-aspect-ratio=1/1' ! omxh264enc ! 'video/x-h264,stream-format=byte-stream' ! filesink location="test.h264" -e

Please set the property yo ximagesrc for a try:

  do-timestamp        : Apply current stream time to buffers
                        flags: readable, writable
                        Boolean. Default: false

And h264 stream may not contain timestamp information. Please add matroskamux to save to mkv file and check again.

I want to save it as a .h264 file not an mkv file. I’m not sure what the property yo is? I don’t see it in the documentation and everything seems to have a default setting