[Live-devel] How to specify Range in RTSPClient that are not using npt

[Matt Schuckmann]

I can actually see using this feature as well.

Matt S.

On Thursday, May 31, 2012 7:21:06 AM, Wiser, Tyson wrote:
> More seriously we need to seek in absolute mode because we would like
> to query video according to the time we recorded it (and not a
> relative time relative to begin of RTSP session).
>
> This is the first time I've ever heard of someone doing this (or even
> wanting to do this). Because it's allowed for (but optional) in the
> RTSP specification, it would be nice if we (at the client and server
> end) supported this. But because it's so rarely used, it's not going
> to be a high-priority feature, unfortunately.
>
> We also had the same requirement of being able to request video based
> on absolute record time, not relative time. When we saw that Live555
> didn’t support this we ended up doing some subclassing so that we
> could override the handling of SET_PARAMETER messages. We then had the
> client pass the desired play time as a parameter to the server before
> sending the PLAY command and had our server check that parameter when
> it started playing. It ended up working well for us and also made it
> so that we could change the play time simply by calling SET_PARAMETER
> again without issuing PLAY, PAUSE, or STOP commands. The downside is
> that now only our client can control the play time since no other RTSP
> client would know about our specific parameter. In theory any client
> would be able to play our live stream (using the “now-“ form of the
> ntp PLAY command) but it wouldn’t be able to get anything other than live.
>
>
>
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