rtph264pay commit 4add820c breaks h264 rendering

We use this lib in rtsp proxy - e4f38c98 works ok, but commit 4add820c breaks h264 stream (video shows blinking grey on vms using ffmpeg for decoding). Source device is Hikvision IP-camera.

Pipeline, ( rtspsrc location=rtsp://admin:...@...:554/Streaming/Channels/101?transportmode=unicast protocols=GST_RTSP_LOWER_TRANS_TCP tcp-timeout=5000000 buffer-mode=slave latency=100 ! rtpjitterbuffer ! application/x-rtp,payload=96 ! rtph264depay ! rtph264pay name=pay0 pt=96 mtu=1280 )