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hi guys,
I was wondering if someone could tell me how rtmp behaves with regards to delay..
is it ever changing
does it always get slowly worse and worse then for me at least, stay at around 10secs until restarted
is there a way of making it behave like UDP - so dropping every bad packet straight away to stay in sync
as it is, it seems if I had two camera pulled in remotely they wouldnt be in sync or stay in sync, so I want to know how to plan to use it
with how it is I would only use it to record interviews and play them out moment after once they're safely in
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Joined: 3/20/2014(UTC) Posts: 2,721   Location: Bordeaux, France Thanks: 243 times
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Trying to use RTMP for production is a very bad idea.
This protocol is very basic and was designed to send a feed to a server in charge of distribution for END USERS where delay or latency is not an issue. This means there is absolutely no mecanism or system to control temporality, not even for a single stream, so obviously even less for several streams that should stay in sync.
Guillaume
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 1 user thanked DWAM for this useful post.
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Joined: 7/1/2015(UTC) Posts: 1,150  Location: Houston TX Thanks: 319 times
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I generally agree with DWAM, RTMP is for distribution, not contribution.
That said, I have used IP cameras that include both RTMP and SIP as means of connection. SIP is more typically found in IP phones and video conferencing. SIP defaults to passing the media via RTP over UDP. It's nearly always point-to-point, which helps with latency.
Most IP cameras deliver H264 which implies some encoding delay, usually 1-2 seconds. Some are capable of MJPEG, which requires more bandwidth but does not add that latency.
So, if your camera has SIP connectivity and supports MJPEG encoding, you can reduce the latency on the feed. Grandstream cameras did this. But have exited the IP camera business over the past year.
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1 user thanked mjgraves for this useful post.
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