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I want to transmit HLS stream to RTP multicast via FFmpeg and use the following command:

ffmpeg -re -i HLSstream -c copy -f rtp_mpegts rtp://ip:port

But the output source сrumbles sometimes (I can't understand periodicity of it). I playing it via VLC and it shows the following errors:

[00007fe17800b508] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 7, expected 2) for PID 0

[00007fe17800b508] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 7, expected 2) for PID 4096

[00007fe17800b508] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 8, expected 7) for PID 17

[00007fe17800b508] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 14) for PID 0

[00007fe17800b508] ts demux error: libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 14) for PID 4096

It works well when I copy the HLS stream to local file and play it.
Is the way to fix it? Or please advice other tool to transmit HLS to UDP.

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    RTP/UDP is a lossy protocol. You should expect lost packets. – SlimSCSI Aug 9 '17 at 20:18
  • ok. thanks! I routed output from ffmpeg to vlc2 with the following command: ffmpeg -re -i HLSstream -c copy -f mpegts - 2>/dev/null | vlc - --ttl=255 -I dummy --sout '#rtp{access=rtp,mux=ts,dst=IP,port=PORT}' :sout-all :sout-keep And it works without errors. In previous variant I saw crumbles each 5-40 seconds. – Ivan Kolesnikov Aug 10 '17 at 6:44
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It's not the best variant, but in my case it helped. I getting data with ffmpeg then routing output to vlc2 via pipe and transmitting it to rtp with the following command:

ffmpeg -re -i HLSstream -c copy -f mpegts - 2>/dev/null | vlc - --ttl=255 -I dummy --sout '#rtp{access=rtp,mux=ts,dst=IP,port=PORT}' :sout-all :sout-keep

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