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Re: [video-codec] Storage format (Re: Proposed charter)

"Ali C. Begen (abegen)" <abegen@cisco.com> Mon, 05 November 2012 15:56 UTC

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From: "Ali C. Begen (abegen)" <abegen@cisco.com>
To: Harald Alvestrand <harald@alvestrand.no>, "video-codec@ietf.org" <video-codec@ietf.org>
Thread-Topic: [video-codec] Storage format (Re: Proposed charter)
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Date: Mon, 05 Nov 2012 15:55:58 +0000
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Subject: Re: [video-codec] Storage format (Re: Proposed charter)
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-----Original Message-----
From: "harald@alvestrand.no" <harald@alvestrand.no>
Date: Monday, November 5, 2012 11:46 AM
To: "video-codec@ietf.org" <video-codec@ietf.org>
Subject: [video-codec] Storage format (Re:  Proposed charter)

>On 11/05/2012 12:47 AM, Cullen Jennings (fluffy) wrote:
>> On Aug 20, 2012, at 18:15 , Timothy B. Terriberry <tterribe@xiph.org>
>>wrote:
>>
>>> 4. Specification of a storage format for non-interactive (HTTP)
>>> streaming or file transfer of the codec. It is envisioned that this
>>> document shall be a Proposed Standard document.
>> I think I would prefer to see this say something a little more specific
>>like do a storage format appropriate for use with DASH. If folks want to
>>propose something other than DASH, sure, replace DASH with whatever, but
>>my point is, I don't want this WG to be charter to do a DASH equivalent
>>just as one of the sides topics. That is enough work it would need it's
>>own WG.
>>
>should we say that it needs to have a storage form that can be chunked,
>stored and reconstructed from chunks?

If you want http streaming support, rather than a simple progressive
download session, it has to be chunked anyway. Maybe the charter should
actually clarify whether we need just progressive download support or a
bit more advanced streaming support.

>
>I think that is the requirement to fit into DASH, and also for things
>like the MediaSource API in W3C; with some more constraints on what
>"chunking" means, it's probably also good enough to fit into Matroska
>and Ogg.

Could be, but see above. Chunking or not chunking is  fundamental question
regardless of you want dash support or not.

>
>(whether chunks are measured in milliseconds or 10s-of-seconds is
>another discussion topic, and more fit for discussing the format draft
>than for discussing the charter.)

Sure, that is something dependent on the desired coding and storage
efficiency, playback capabilities and things like that. Not specifically a
charter level discussion.

>
>
>
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