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Re: [MMUSIC] Review of Section 10 - RTSP Feature table
Hi,
Lets start with the general comments.
>
>Some general comments / queries :
>
> 1.A PLAY request without a Range header is legal. It starts playing a
> stream from the beginning unless the stream has been paused. If a
> stream has been paused via PAUSE, stream delivery resumes at the
> pause point. If a stream is playing, such a PLAY request causes no
> further action and can be used by the client to test server liveness.
>
>
> Lets consider this scenario
> * The client wants to play the entire movie once again.
> immediately after the first PLAY is over
> * It sends a PLAY request without the Range header
> while the first PLAY is still playing.
>
>
>In this case it would be treated as a 'ping' to test the
>server liveliness. Is it possible to have a mechanism
>to differentiate between the request that could be
>used as a 'ping' and a request to play the entire movie
>once again??
>
The use of PLAY for pinging the server about liveness will be
deprecated. Instead the other methods for this should be use, RTCP,
PING, SET_PARAMETER, or OPTIONS.
We are currently leaning towards removing queued play. This is primarily
due to lacking any valid use case for queued play. Without queued play
you can't request the movie again until it has played to end and the
client issues a PAUSE followed by a PLAY.
>
>BTW, What is meant by precise editing?
>
I believe the mentioning of precise editing was due to the fact that you
could by a series of play requests could create an edited version of
the media (requires queued play).
>
>
>2. Is it possible for a 'PAUSE' request to contain a Range header with the
> value (i.e pause point) greater than the value that has actually been
> played out ?
>
Yes, as long as it contains a range which is part of the range that
actually is requested to be played.
>
> For eg. if a 'PLAY' has been issued for range '10 - 20' and media has
> played say upto '15' then, is it possible by any of the media client to
> send a 'PAUSE' request with a 'Range' header value of '18' ???
>
> If the above is possible and is valid, then once the 'PAUSE' request for
> the above is recd., do we finish playing the media upto '18' and then
> pause ???
>
Yes, you are correct. This is exactly what is possible with PAUSE with
range header.
Regards
Magnus Westerlund
Multimedia Technologies, Ericsson Research ERA/TVA/A
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Ericsson AB | Phone +46 8 4048287
Torshamsgatan 23 | Fax +46 8 7575550
S-164 80 Stockholm, Sweden | mailto: magnus.westerlund@era.ericsson.se
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