RE: [AVT] New draft-ietf-avt-mpeg4-simple-07
Franceschini Guido <Guido.Franceschini@TILAB.COM> Wed, 26 February 2003 10:40 UTC
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Date: Wed, 26 Feb 2003 11:27:11 +0100
From: Franceschini Guido <Guido.Franceschini@TILAB.COM>
Subject: RE: [AVT] New draft-ietf-avt-mpeg4-simple-07
To: jan.vandermeer@philips.com, avt@ietf.org
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Jan, unfortunately I have to disagree with the text you modified with respect to Colin's text. I am fine with supporting early implementations, but the wording used is, IMHO, not suitable. More specifically you wrote: If the "constantDuration" parameter is not present, then Access Units are assumed to have a variable duration, unless the AU-Index is present and coded with the value 0 in each RTP packet. How can a receiver implement the rule above? Should it observe 1, 10, 1000 or infinite packets before determining that the "AU-Index is present and coded with the value 0 in each RTP packet" ? What is the exact legacy that you want to support ? Maybe there is a different mechanism to support it. For example, a specific mode definition might IMPLY a specific "constantDuration" value, without writing this explicitely in the SDP. Best regards Guido Franceschini TILAB - Multimedia Division Via G.Reiss Romoli 274 I-10148 Torino, Italy tel + 39 011 228 6137 fax + 39 011 228 6299 -----Original Message----- From: jan.vandermeer@philips.com [mailto:jan.vandermeer@philips.com] Sent: Wednesday, February 26, 2003 3:03 AM To: avt@ietf.org Cc: avt-admin@ietf.org Subject: [AVT] New draft-ietf-avt-mpeg4-simple-07 Dear all, This is to let you know that I just submitted draft-ietf-avt-mpeg4-simple-07 for upload to the IETF. For your convenience I attached the draft to this email. Compared to -06 there are several editorial improvements. In addition, all comments provided by Colin are incorporated with one small difference. Colin suggested the following text on interleaving in 3.2.3.2 (page 17): If the "constantDuration" parameter is not present, then Access Units are assumed to have a variable duration. In this case, the transmitter MUST use the AU-Index to encode the index information required for re-ordering, and the receiver MUST use that value to determine the index of the first AU in the RTP packet. ... I changed this to the following text, in order to accomodate "early implementations" that do not use the constantDuration parameter when transmitting constant duration AUs. If the "constantDuration" parameter is not present, then Access Units are assumed to have a variable duration, unless the AU-Index is present and coded with the value 0 in each RTP packet. When transmitting Access Units of variable duration, then the "constantDuration" parameter MUST NOT be present, and the transmitter MUST use the AU-Index to encode the index information required for re-ordering, and the receiver MUST use that value to determine the index of each AU in the RTP packet. ... From my perspective the document is ready now. All known comments are incorporated (Colin and Steve thanks for your help !) and therefore I think we are done, unless any further issues are identified. Best regards / Groeten, Jan ----------------------------------------------------------- Jan van der Meer Philips - MP4Net Prof Holstlaan 4 Building WDB-1 P.O. Box 80021 5600 JZ Eindhoven The Netherlands Phone +31 402 735 774 Fax +31 402 735 545 ==================================================================== CONFIDENTIALITY NOTICE This message and its attachments are addressed solely to the persons above and may contain confidential information. If you have received the message in error, be informed that any use of the content hereof is prohibited. Please return it immediately to the sender and delete the message. Should you have any questions, please contact us by replying to MailAdmin@tilab.com. Thank you ====================================================================
- [AVT] New draft-ietf-avt-mpeg4-simple-07 jan.vandermeer
- RE: [AVT] New draft-ietf-avt-mpeg4-simple-07 Franceschini Guido
- Re: [AVT] New draft-ietf-avt-mpeg4-simple-07 Colin Perkins
- RE: [AVT] New draft-ietf-avt-mpeg4-simple-07 Franceschini Guido
- Re: [AVT] New draft-ietf-avt-mpeg4-simple-07 Colin Perkins
- Re: [AVT] New draft-ietf-avt-mpeg4-simple-07 jan.vandermeer