[M4IF Technotes] Bifs-text scene description - streaming movietexture

[Dave Singer]

At 22:45 +0200 10/16/02, Nicholas Smit wrote:
>  > Hi Nicholas,
>>
>>  I'm very curious if somebody answered your questions already.
>>  I really 
>>  would like to know the answers as well.
>
>
>Hi Mathijn - thanks for the info you sent in that url.
>
>Yes, a lot of people have helped trying to answer this - big thanks to
>Cyril, Guido, JC and Mikael.
>
>The short answer, as far as I can work out, is that yes you are correct:
>It is theoretically possible, but hasn't been defined - not by ISMA or
>MPEG / ISO. Largely due to lack of interest, apparently.(!)

well, usually we refer to whole MP4 files, so the question of an 
anchor format doesn't come up.
I'm curious;  who defines the URL format for referencing anchors in 
files?  Is this something that MPEG defines as it owns the file 
format, or W3C as they define what a URL looks like?
>
>What would work, is to write your own (or extend another) server so that
>it can parse something like rtsp://example.com/stream.mp4#1 to return
>the first track in stream.mp4, or similar.  This is given that your
>player understands rtsp.
>
>
>If your OD looked like this:
>
>		ObjectDescriptor {
>			objectDescriptorID 20
>			esdescr [
>				ES_Descriptor {
>					es_id 3
>					URLString
>"rtsp://localhost:554/..."
>					decConfigDescr
>DecoderConfigDescriptor {
>						objectTypeIndication 32
>						streamType 4
>						decSpecificInfo
>DecoderSpecificInfoString {
>						}
>					}
>					slConfigDescr SLConfigDescriptor
>{ ... }
>				}
>			]
>		}
>
>Cyril noted that "Here the URL shall point to a SL-packetized stream
>following the SLConfigDescriptor. You could point to a particular track
>in a remote mp4. In that case, the SLConfigDescriptor is empty. But
>again, I'm not sure that MPEG has standardized the way to access a track
>within an MP4 file."
>
>HTH.
>
>Kind regards,
>
>Nik.
>
>
>
>
>
>
>>
>
>>
>>  That url business is quite tricky and there are no really
>>  good sources 
>>  about it.
>>  The delivery faq, section 24 specifies which url's will be
>>  supported, 
>>  however:
>>	http://mpeg.telecomitalialab.com/faq/mp4-dmi/mp4-dmi.htm#24
>>
>>  I also know that Envivio supports live broadcasts of video
>>  and audio, 
>>  so it should be possible. I don't know which url syntax they use for 
>>  it... and if it is the standarized way to do it.
>>  I also know that they allow streaming of content from within
>>  the same 
>>  file, but that it is not possible to do it cross-file. The latter is 
>>  only possible with Inline nodes. But as you said, that is not really 
>>  flexible enough.
>>
>>  What I get from the standard, is that it should all be possible in 
>>  theory. I think we've to wait for the implementations...
>>
>>  Please let me know of any answers you receive...
>>
>>  Best regards,
>>
>>  Mathijn
>>
>>  On Tuesday, Oct 15, 2002, at 14:33 Europe/Amsterdam, Nicholas Smit 
>>  wrote:
>>
>>  >> Hi,
>>  >>
>>  >> Movie textures are not supported in any streaming standard
>>  >> (RFC 3016 or ISMA). Neither do I know about any proprietary
>>  >> way of doing it. You may have to device your own scheme for this.
>>  >>
>>  >> Regards,
>>  >> Parimal.
>>  >>
>>  >
>>  >
>>  > Hmmm, so then how are applications like (implemented
>>  versions of) the
>>  > following from enst supposed to work?
>>  >
>>  > http://161.58.176.70/downloads/content/MIRRORSITE/interoperability/
>>  > ENST/
>>  > ecran2.mp4
>>  >
>>  > Inlineing the sources is fine, until you want to manipulate
>>  them in 
>>  > some
>>  > way, such as full screening them....
>>  >
>>  >
>>  > Thanks,
>>  > Nik.
>>  >
>>  >
>>  >
>>  >> -----Original Message-----
>>  >> From: Nik [mailto:salo   rucus.ru.ac.za]
>>  >> Sent: Tuesday, October 15, 2023 2:22 AM
>>  >> To: technotes   lists.m4if.org
>>  >> Subject: [M4IF Technotes] Bifs-text scene description -
>>  >> streaming movietexture
>>  >>
>>  >>
>>  >> Hi streaming experts,
>>  >>
>>  >> I'd really appreciate help with this.
>>  >>
>>  >> I need a movietexture that uses live video as its source,
>>  >> such as "rtsp://localhost:554/vid.mp4".
>>  >>
>>  >> How do you specify the OD's and the ESD's for this?
>  > >>
>>  >> Can anyone give me some pointers on this, or even the url to
>>  >> a similar mp4 on the net somewhere?
>>  >>
>>  >> I'm also a little confused as to how a player will know which
>>  >> track to use from a url like "rtsp://localhost:554/vid.mp4"
>>  >> for the movietexture....?
>>  >>
>>  >>
>>  >> Any help very appreciated.
>>  >>
>>  >> Kind regards,
>>  >> Nicholas.
>>  >>
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>>  >
>>  >
>>  < Mathijn Elhorst | Lead Developer
>>
>>  Lost Boys B.V. | www.lostboys.nl | mathijn.elhorst   lostboys.nl
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>>
>>
>>
>>
>
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-- 
David Singer
Apple Computer/QuickTime