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Video can be very bandwidth demanding in short term time intervals. I.e. video's short term bandwidth demand can be much, much higher than its nominal or average bandwidth usage. Real-time video, like video conferencing, also often has tight timing requirements, so when there's a burst, you don't want to delay it.
Ideally you want to treat video conferencing video like LLQ/PQ and have sufficient bandwidth that there's no to very little queuing.
Marking video AF41 can mean much or mean little. Many additional variables apply.
