omxh264enc and mpegtsmux problem

[pinwheel]

I am testing this pipeline on a Raspberry Pi 3 (B):

gst-launch-1.0 v4l2src device=/dev/video0 !
"video/x-raw,width=1280,height=720,framerate=15/1" ! videoconvert !
omxh264enc control-rate=1 target-bitrate=3000000 ! h264parse
config-interval=1 ! mpegtsmux alignment=7 ! filesink location=test.ts

When I play the video file the bottom half of the screen is full of
artifacts. I have also tested this with an udpsink and SRT. 

If I change the pipeline to this the artifacts are gone:

gst-launch-1.0 v4l2src device=/dev/video0 !
"video/x-raw,width=1280,height=720,framerate=15/1" ! videoconvert !
omxh264enc ! h264parse config-interval=1 ! mpegtsmux alignment=7 ! filesink
location=test.ts

(when I use matroskamux the video is also without artifacts)

I'm using  gst-omx version 1.10.4 (current Raspbian package) 



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