> We try to use live555 testOnDemandRTSPServer example with some modification
> to stream "low-latency" live video together with hardware HEVC encoder.
> Almost everything works fine inside the local network and we are able to
> playback video via VLC player. However, our goal is to transmit video over
> mobile network (4G/LTE) which is not always one hundred percent stable.
> According to measurements there is about 0,01% dropped frames from all
> requested frames by using RTP over UDP protocol.
Congratulations. That’s a remarkably low packet loss rate.
> We try to find a cause and solution how to minimize/eliminate corrupted grey
> frames inside the video
I recommend that you reconfigure your encoder so that each key frame is encoded
as a sequence of ’slice’ NAL units, rather than as a single NAL unit.
People often have trouble streaming H.264/H.265 video with extremely large key
frames, if each key frame gets encoded as a single NAL-unit. The problem with
this is that these NAL units get sent as a (very long) sequence of RTP packets
- and if even one of these RTP packets gets lost, then the whole NAL (key frame
in this case) will get discarded by the receiver; see
http://lists.live555.com/pipermail/live-devel/2011-December/014190.html
http://lists.live555.com/pipermail/live-devel/2012-August/015615.html
http://lists.live555.com/pipermail/live-devel/2013-May/016994.html
http://lists.live555.com/pipermail/live-devel/2014-June/018426.html
http://lists.live555.com/pipermail/live-devel/2014-June/018432.html
http://lists.live555.com/pipermail/live-devel/2014-June/018433.html
http://lists.live555.com/pipermail/live-devel/2014-June/018434.html
http://lists.live555.com/pipermail/live-devel/2015-March/019135.html
http://lists.live555.com/pipermail/live-devel/2015-April/019228.html
For streaming, it’s better to encode large key frames as a sequence of ‘slice’
NAL units.
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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