Re: [MMUSIC] An error in SDP syntax regarding r= lines?

[Colin Perkins <csp@isi.edu>]

--> "Federico Montesino Pouzols" writes:
>>>	So I guess the first offset could be non zero only if the start
>>>time given in the corresponding t= line were shifted from the actual
>>> beginning of the session. I believe the first offset is always 0 and it
>>> could be omitted if backward compatibility were not a concern. Is it
>>> true?
>>
>> The ABNF in RFC 2327 does not require the leading zero.
>
>I see, the explicit zero does not fit the RFC ABNF. However
>I keep wondering the same question: is actually the first offset
>always zero? I mean, although the RFC ABNF does not mandate it, the
>text describing r= lines (the same in both RFC 2327 and
>draft-ietf-mmusic-sdp-new-10) seems to imply that the first offset is
>always zero. The examples and explanations given in both documents
>make me think that the first offset correponds to the beginning of the
>session (as opposed to the first time the session is resumed), thus
>being zero.
>
>	Is this interpretation right or is there any case in which the
>first offset can be non zero?

The first offset does correspond to the beginning of the session, and I
would expect it to be zero. There's no requirement for this though, and
a non-zero offset would change the start time of the session.

Colin

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