Friday, March 20, 2015

Re: [Avid-L2] DPX to deliverable file issues?

 

I have been testing on MC w/Symphony option, v 8.3, on Windows 7, using TerraBlock.

I've been using DPX frames sending out to flame and back for effect shots.  As long as some of the same old rules are respected the process is quite seamless (that AVID thinks in 709 color space). DPX can contain additional metadata, primarily timecode coming in and going out, which is very handy over using TIFF sequences.  Roundtripping to Flame sees NO gamma or level shifts when the settings are matched.

Bringing in frames are always an AMA link, and you need REALLY fast storage, lots of ram and cores to play back in real time, but once transcoded to a "native" AVID codec playback performance is much better.

My primary irritation is that you can't save the AMA export settings (or profiles, as in AS-11).  The defaults AVID picked are all wrong so it's a PITA.  They offer 8, 10 and 16 bit export on DPX frames, but the manual says only 10 bit are currently supported. This is especially "funny" since the avid output module defaults to 8 bit.

DPX frame exports don't come close to real time.  If you are exporting anything long form it will take you many times real time, depending on your storage and CPU power.

Also did some tests using DPX for UHD workflows.  In my testing of a DPX in and DPX out online methodology, I have discovered that with many plugins (not all) the DPX export fails to output the rendered result, and instead exports the un-effected background layer of the top piece of video under a plugin.  Only way around this is to do a video mixdown.  But sadly you have to use a DNxHR resolution for your mixdown, as an uncompressed UHD output is not yet offered.

I am hopeful many of these issues get sorted quickly.

Dave Hogan
Burbank, CA



On Wednesday, March 18, 2015 8:03 AM, "owen owen@thenowcorporation.com [Avid-L2]" <Avid-L2@yahoogroups.com> wrote:


 
Hi,
DPX files opened in Avid, conformed and exported for broadcast on MC 8 ? Are there going to be the old
Gamma etc issues? Has anyone on the L tested this yet?

owen


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Posted by: Dave Hogan <mactvman@yahoo.com>
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