Hi,
You may run in CBR and set virtual buffer size for a try. Please refer to
Random blockiness in the picture RTSP server-client -Jetson TX2 - #5 by DaneLLL
Not sure why only Baseline works for 3rd players. You may try to decode the stream by running gst-launch-1.0 command. There are sample commands in
Jetson 4k Encoding -> Decoding Pipeline and latency - #11 by DaneLLL