[theora] Elphel's JP4

Carlos Jose Lenarts Ramis elohe at users.sourceforge.net
Fri May 14 00:39:52 PDT 2010

As part of feasible to use a intra only Theora for bayer patern video is a
good idea as the intra compression of Theora is better than the jpeg
compression, even is easy to extend the specification for this purpose, the
only need is to add a new color space for the bayer data and redefine the
pixel format for this color space to indicate the exact pattern. (Chapter 6
of the Theora specification)

2010/5/14 Paulo Henrique Silva <ph.silva at gmail.com>

> Hi,
> just a small follow up of recent discussions about Elphel's JP4 format.
> I'm working with Andrey and fellows from Elphel to improve support for
> JP4 format in the context of Elphel's Apertus project
> (http://www.apert.us). As posted by Basil, on
> http://wiki.elphel.com/index.php?title=JP4 there is plenty of
> information about the format and how to post process it to get back
> your real footage.
> At this moment, you could use MPlayer and gstreamer tools to play JP4
> encoded movies and convert JP4 movies and stills to DNG (Adobe's
> Digital Negative raw format, which in lack of any standard raw format,
> seems to be good enough to us at this moment).
> I'm looking forward to see if it is possible to use intra only Theora
> to encode JP4 as Basil suggested, would be great to have a nice
> compressed Bayer format which doesn't need any patches to be played
> and processed anywhere.
> Feel free to contact me about any issues you have trying to use our JP4
> files.
> Cheers,
> -- Paulo
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