Hi,
It looks like there is no free bitstream analyzer. A possible way is to check the picture type and packet size through ffprobe. We can encode two streams:
01_video_encode$ ./video_encode /home/nvidia/test.i420 1280 720 H264 test.h264 --egdr -gdrf gdr_params.txt --input-metadata -gdrof gdr_out.h264
01_video_encode$ ./video_encode /home/nvidia/test.i420 1280 720 H264 test_1.h264
And run the command:
$ ffprobe -i test.h264 -show_frames | grep 'pict_type\|pkt_size'
$ ffprobe -i test_1.h264 -show_frames | grep 'pict_type\|pkt_size'
The picture type and packet size of frames are different between the two stream. However, for accurate check , you may need to get a bitstream analyzer.