[opendtv] Re: Global standard

  • From: "Mike Tsinberg" <Mike@xxxxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Fri, 4 May 2012 10:44:53 -0400

Very nice discussion - thank you!

So if we have a free hand to recommend a digital standard (Transport,
Compression, IP header) for video delivery through wireless media on a
global scale what would it be? 



Best Regards,
Mike Tsinberg
http://keydigital.com



> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-
> bounce@xxxxxxxxxxxxx] On Behalf Of Olivier Houot
> Sent: Friday, May 04, 2012 9:43 AM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: Global standard
> 
> Craig Birkmaier wrote:
> >It is time to let go of interlace, 59.94, and maybe even 50P. A more
> >logical heirarchy for the future would be:
> 
> >24P for film
> 
> >36P for talking head and low motion video
> 
> >60 and/or 72P for rapid motion.
> 
> Regarding the choice of a universal frame rate,
> 
> considering some papers by Mark Shubin and some considerations of John
> Watkinson on the need for really high frame rate for realistic motion
> rendition and the efficiency of compression for the highly
> correlated/redundant input material that such rates would produces, it
> would seem natural to settle on 300 Hz, which is no longer unrealistic
> with the current state of technical affairs.
> 
> This achieves compatibility with both 50 Hz and 60 Hz legacy material
> by simple frame duplication.
> 
> It brings on the table the superior compatibility with films of 50-
> multiple standards ("PAL speed up"), in preference to the motion-
> crippling 3:2 pulldown workaround, though in principle both could still
> be used.
> There is still the possibility of using motion compensation for those
> who accept neither of those compromises.
> 
> At the beginning, one could still use either 50P or 60P cameras and
> duplicate frames. So one could shoot in every country at the correct
> rate to avoid beating with the mains frequency.
> On LCD (non pulsed) displays, the repeated frames would simply merge
> into a single one with a longer display time, essentially recreating
> the original captures rate.
> Because of the redundancy of duplicated frames, compressed bit rate
> would indeed not be much higher than the current one, or equal if we
> simply transmit 50 or 60P and let the receiver to the duplication.
> 
> Once the standard is deployed, with the improvement in camera
> technology, it will be possible to capture at 75 fps, then 150 fps,
> then finally the full 300 fps and still retain full compatibility in
> the process (though one should be prepared to allocate more bandwidth
> when that happens, unless compression technology has advanced to the
> point where it can absorb the difference).
> 
> This slightly favours the 50 Hz world when it comes to shooting in
> artificial light, as it would operate correcly at 50, 150 and 300 fps,
> while 60 Hz lighting could only use 60 and 300. But 50 Hz is what most
> countries of the world use, so by virtue of numbers, it should be given
> priority. Also it is more universal, being more film friendly, while 60
> Hz is essentially only compatible with itself.
> 
> Even if we don't fully use the 300 Hz capability initially, it will
> still be very useful as a unifying standard. It would require little or
> no initial upgrade of transmission facilities to achieve this, what it
> needs is a 300 Hz capable display, which the manufacturers seem to
> already provide. In the case of external set top boxes receivers,
> though, what would be missing would be a standard to transmit
> uncompressed 300 fps from the box to the display (about 7.5 Gbps in
> 4:2:0, 8 bits, 2D, within capability of HDMI 1.3 hardware). This is
> less of a problem if the receiver is integrated into the display.
> 
> 
> 
> 
> 
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