[vlc-devel] VLC RTSP Server Support for Keep-Alive Messages to Kill Orphaned Streams?

[Robert Krakora]

2009/7/15 Rémi Denis-Courmont <remi at remlab.net>:
> Le mercredi 15 juillet 2009 22:47:33 Robert Krakora, vous avez écrit :
>> Again, thanks for the quick response.  May I inquire how then does the
>> VLC RTSP server handle orphaned RTSP sessions?
>
> RTSP sessions are not such a big deal. They just time out via normal TCP
> transport semantics. Similarly RTP over DCCP will time out through congestion
> control. RTP over UDP is never timing out, and that is a problem.
>
>> How about a command line and GUI option that allows the minimum
>> "keep-alive" functionality described in the RFC to be utilized (i.e.
>> GET_PARAMETER and PLAY).  Of course the RTSP server would also have to
>> convey the "keep-alive" timeout to the RTSP clients so that they know
>> to send "keep-alives" and at what interval to send them.
>
> No. IIRC, the keep-alive has a default value, and I see no strong reason to
> not follow the default, but that's not the real problem.
>
>> Surprise
>> removal of RTSP clients without TEARDOWNs being issued happens all the
>> time with settop boxes in situations where they lose power (unplugged
>> for instance) or are reset by users.
>
> There is no "theoretical" problem. VLC just needs to reset the (would-be)
> timer when _either_ an RTSP request comes _or_ a valid RTCP-RR is received.
> When the timer fires, the RTP stream is dropped. Nobody has ever bothered to
> implement this.
>
> --
> Rémi Denis-Courmont
> http://www.remlab.net/
>
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>

Remi:

RTP over UDP is what I am utilizing.  I am going to look into
implementing this as I need this feature if there are no objections.

Best Regards,

-- 
Rob Krakora
Senior Software Engineer
MessageNet Systems
101 East Carmel Dr. Suite 105
Carmel, IN 46032
(317)566-1677 Ext. 206
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