Re: [MMUSIC] draft-ietf-mmusic-image-attributes, question regarding frame rate

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Thu, 03 June 2010 06:39 UTC

From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Roni Even <Even.roni@huawei.com>, 'mmusic' <mmusic@ietf.org>
Date: Thu, 03 Jun 2010 08:39:23 +0200
Thread-Topic: draft-ietf-mmusic-image-attributes, question regarding frame rate
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Subject: Re: [MMUSIC] draft-ietf-mmusic-image-attributes, question regarding frame rate
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Hi

Thanks for the reply
The frame rate was in the first individual submissions, but I later removed it after some discussion. But I am inclined to agree, I don't believe that frame rate really fits here so I will not include frame rate in the draft.

Regards
Ingemar 

> -----Original Message-----
> From: Roni Even [mailto:Even.roni@huawei.com] 
> Sent: den 2 juni 2010 17:53
> To: Ingemar Johansson S; 'mmusic'
> Subject: RE: draft-ietf-mmusic-image-attributes, question 
> regarding frame rate
> 
> Hi,
> I am not sure that frame rate was in this draft. There is an 
> SDP attribute for frame rate see RFC 4566 section 6 a=framerate.
> 
> As for this draft, the motivation is to allow a receiver not 
> to scale the image and frame rate is not related to scaling 
> just the image size.
> 
> Roni Even
> 
> > -----Original Message-----
> > From: Ingemar Johansson S [mailto:ingemar.s.johansson@ericsson.com]
> > Sent: Wednesday, June 02, 2010 4:27 PM
> > To: mmusic
> > Cc: Roni Even; Ingemar Johansson S
> > Subject: draft-ietf-mmusic-image-attributes, question 
> regarding frame 
> > rate
> > 
> > Hi
> > 
> > First of all, thanks for all the comments on the image 
> attribute draft.
> > I will submit a new version at the end of the week or early 
> next week.
> > 
> > I received a question regarding frame rate . In an early version it 
> > was possible to specify a frame rate range. See 
> > 
> http://tools.ietf.org/id/draft-johansson-mmusic-image-attributes-01.tx
> > t
> > 
> > For some reason this was removed but I don't anymore 
> remember why. I 
> > recall that the reason was that, while frame rate may have 
> a meaning 
> > in older codecs such as H.261, it has less meaning for e.g H.264. 
> > Moreover the "framerate" in H.264 is given by the level. But it is 
> > possible that my memory is totally off.
> > Any comments around this are welcome
> > 
> > Regards
> > /Ingemar
> > =================================
> > INGEMAR JOHANSSON  M.Sc.
> > Senior Research Engineer
> > 
> > Ericsson AB
> > Multimedia Technologies
> > Labratoriegränd 11
> > 971 28, Luleå, Sweden
> > Phone +46-1071 43042
> > SMS/MMS +46-73 078 3289
> > ingemar.s.johansson@ericsson.com
> > www.ericsson.com
> > Visit http://labs.ericsson.com !
> > =================================
> 
>

[MMUSIC] draft-ietf-mmusic-image-attributes, ques… Ingemar Johansson S
Re: [MMUSIC] draft-ietf-mmusic-image-attributes, … Ingemar Johansson S
Re: [MMUSIC] draft-ietf-mmusic-image-attributes, … Kyunghun Jung
Re: [MMUSIC] draft-ietf-mmusic-image-attributes, … Roni Even