Hi,
I am attempting to use the VLC player (live555.com Streaming Server) to receive
a live video stream from a DVR using RTSP. The DVR uses byte-streaming
protocol even though it is RTSP/RTP. The VLC player 'chokes' (generates packet
decoding error and does not recover) when the DVR sends its name identification
packet on the control channel. The byte sequence of the RTCP is as below:
24 01 00 38 80 C8 00 06 D0 3E 1A 9F DC 7D 5D 66 2B 03 4B 0E 84 21 3B 1A
00 00 00 01 00 00 1B 2A 81 CA 00 06 D0 3E 1A 9F 01 0E 55 6E 6E 61 6D 65 64 20
73 74 72 65 61 6D 00 00 00 00
As you can see, the RTCP packet contains a 00 00 00 and a 00 00 01 sequence.
This appears to be the cause of the 'decoding'. If I intercept the packet and
reformat as below, no errors (added two '03' escape bytes):
24 01 00 3A 80 C8 00 06 D0 3E 1A 9F DC 7D 5D 66 2B 03 4B 0E 84 21 3B 1A
00 00 03 00 01 00 00 1B 2A 81 CA 00 06 D0 3E 1A 9F 01 0E 55 6E 6E 61 6D 65 64
20 73 74 72 65 61 6D 00 00 03 00 00
Should RTCP content have to be escaped? I.e., do I need to follow up with DVR
manufacturer and have them correct their output, or is this a Streaming Server
bug? Any NAL content would follow RTP/RTCP headers.
Thanks for your consideration,
Kurt
Kurt Emanuelson
Software Engineer
ph: (719) 593-2829
Fax: (719) 213-2502 | http://www.boldgroup.com
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