How to set level for omxh264enc on TX1 r28.1

How to set the level of h264 file which is encoded by this pipeline

gst-launch-1.0 videotestsrc ! nvvidconv ! omxh264enc profile=1 ! h264parse ! video/x-h264,stream-format=byte-stream ! filesink location=test.h264

The level of the h264 file is baseline@L5.2,How to make it with lower leve?
My TX1 is flashed by Jetpack3.1,r28.1.
Is there some way to set level without update Jetpack?
Thanks!

Hi,
On r28.1, please apply the patch and rebuild libgstomx.so:
https://devtalk.nvidia.com/default/topic/1024757/jetson-tx2/tx2-h264-encoded-videos-will-not-play-in-web-browsers/post/5212765/#5212765
Source code is at
https://developer.nvidia.com/embedded/dlc/l4t-sources-28-1

On r28.2, it can be configured through pipeline:
https://devtalk.nvidia.com/default/topic/1024757/jetson-tx2/tx2-h264-encoded-videos-will-not-play-in-web-browsers/post/5253032/#5253032

Thanks you DaneLLL!
It works by rebuild libgstomx.so!