Re: [MMUSIC] RTSP: Range response when PLAY request fails

[Magnus Westerlund <magnus.westerlund at ericsson.com>]

Rémi Denis-Courmont skrev:
> On Monday 03 November 2008 16:51:34 ext Magnus Westerlund, you wrote:
>> If no Range header was in the request, the format used in any previous
>> PLAY request within the session SHOULD be used.
> 
> and
> 
>> It is RECOMMENDED that NPT is used if supported by the media.
> 
> reads contradictory to me. Is it so that the last sentence only applies to the 
> case that no format has ever been used?

Yes, that is the intention. Note that I have made no changes to the
first paragraph. But if there is unclear text it should be fixed.

> 
> Also, how to ensure that the client will understand the format? I'd rather 
> have MUST use the same format as the PLAY request, MUST use NPT if no Range 
> in the request. If the client wants something other than NPT, it can always 
> put the right format in the request.

I agree that changing the SHOULD to a MUST would be an improvement here.
 However, if no format has been indicated then using any of the ones in
the Accept-Ranges header would be suitable. I can agree that a
recommendation for NPT is fine in this case. Do note that there is a
requirement to include this header in the SETUP request.

> 
> And if the client uses a format that the server does not understand, the 
> client is buggy.
> 
Yes, this text doesn't discuss this at all as this is covered in an
other place.

Cheers

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
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Multimedia Technologies, Ericsson Research EAB/TVM
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