gdppay : segmentation fault when use gdppay and gdpdepay

Submitted by Stephen Lu

Link to original bug (#785804)

Description

This is a sample.
rtspsrc protocols=4 location=rtsp://ip_address ! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! gdppay ! gdpdepay ! autovideosink

** (gst-launch-1.0:13870): CRITICAL **: gst_video_info_from_caps: assertion 'gst_caps_is_fixed (caps)' failed
Caught SIGSEGV
Spinning. Please run 'gdb gst-launch-1.0 13870' to continue debugging, Ctrl-C to quit, or Ctrl-\ to dump core.

Version: 1.12.2