TK1 Hard decode

I hard coded H264 on TK1 using omxh264enc, but I couldn’t set its I frame interval. It’s now 60 frames before I frames appear once. I want to change the I frame spacing by using iframeinterval, using this property, warning is not found. Thank you!

PLease try

$ gst-launch-1.0 videotestsrc num-buffers=300 ! omxh264enc  iframeinterval=25 ! qtmux ! filesink location=a.mp4