[Libav-user] Detecting broken frame
T.Glover at nottingham.ac.uk
Thu Oct 11 23:10:47 CEST 2012
You can always detect when packets are lost or out of order via checking the sequence numbers that are contained within each packet, these are just sequential numbers contained in the packet header. The header will also typically tell you whether this packet is the start or end of a frame.
However, usually you would not want to get the missed frames re-sent if you have already processed more recent frames, these would be of no use to you. You could wait for the missing data to be re-sent if it's been missed, but typically applications such as this would use TCP to ensure reliable data delivery. As the other reply to this mail also stated, what would you show the user while the video was stalling? Packet loss is an inevitable part of transmitting data over networks using UDP and some applications handle the loss better than others.
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