hello,
profiles hierarchy does not, most of the times, imply being fully subsets
or supersets of each other...
Loss resilience is an example.
I believe that with QTP export mechanisms you can target directly to an
.mp4 file and allegedly change the 'profile' to be used.
When I tried, some time ago, I found that profile selection did not work
as advertised...
best regards
andrea
RJL:=Robert J. Landle
RJL> Andrea,
RJL>
RJL> Thanks for the response. I wasn't clear on what profile QT
RJL> supported.
RJL>
RJL> I suppose I assumed if they were "Main" profile compliant, that they
RJL> would have all the "baseline" profile tools as well.
RJL>
RJL> No, unfortunately I don't have an Ipod for testing.
RJL>
RJL> I am using Quicktime mostly for testing my encoder. So far it's been
RJL> adequate for this.
RJL>
RJL> I suppose I'll have to move on to another decoder for testing FMO.
RJL>
RJL> I wonder why Quicktime chose to go Main profile only ?
RJL>
RJL> I suppose it's main purpose isn't real-time decoding anyway.
RJL>
RJL> Thanks again.
RJL>
RJL> Cheers,
RJL> Bobby
RJL>
RJL>
RJL>
RJL> -----Original Message-----
RJL> From: Andrea Barbieri [mailto:email@hidden]
RJL> Sent: Thursday, September 07, 2006 7:48 PM
RJL> To: Robert J. Landle
RJL> Cc: email@hidden
RJL> Subject: Re: QT 7.1 h.264 and FMO
RJL>
RJL>
RJL> Hello
RJL>
RJL> FMO is part of the loss resilience features...
RJL>
RJL> Main Profile does not support FMO.
RJL>
RJL> QT Player 7.x H.264 codec is Main Profile so it seems reasonable to
RJL> reject it when trying to decode it.
RJL>
RJL> One interesting point is that Baseline Profile does include FMO.
RJL>
RJL> the iPod video is Baseline 1.3 Profile compliant... in theory therefore
RJL> it should be able to decode it. Are you able to perform such test?
RJL>
RJL> best regards,
RJL> andrea
RJL>
RJL> RJL:=Robert J. Landle
RJL>
RJL> RJL> Does QT 7.1 support FMO ?
RJL> RJL>
RJL> RJL> I am using the JM 11.0 H.264 encoder to create a .264 file using
RJL> FMO.
RJL> RJL>
RJL> RJL> I then used the MPEG4IP mp4creator tool (v1.5.0.1) to create my mp4
RJL>
RJL> RJL> file.
RJL> RJL>
RJL> RJL> This MP4 file does not play in QT 7.1
RJL> RJL>
RJL> RJL> I used the MPEG4IP h264parser tool on my .264 file and it looks
RJL> fine.
RJL> RJL>
RJL> RJL> What's up ?
RJL> RJL>
RJL> RJL> Thanks in advance.
RJL> RJL> Bobby
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RJL> RJL>
RJL>
RJL> --
RJL> Andrea Barbieri
RJL> PGP ID=0x034DFD5A
RJL> KeyFingerprint=C168EA9A7189538D214F1281A7529F32034DFD5A
RJL> Moving Image Research
RJL> http://www.movingimageresearch.com/
RJL> The Workshop, Hampton Lane, Bristol, BS6 6LE, UK Tel +44 117 9732200,
RJL> FAX +44 117 9732210
RJL>
RJL>
--
Andrea Barbieri
PGP ID=0x034DFD5A KeyFingerprint=C168EA9A7189538D214F1281A7529F32034DFD5A
Moving Image Research http://www.movingimageresearch.com/
The Workshop, Hampton Lane, Bristol, BS6 6LE, UK
Tel +44 117 9732200, FAX +44 117 9732210
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