Thursday, February 16, 2017

Re: [Avid-L2] exports taking very long

 

So I decided to run a couple of quick tests.  Here are some of the result I am getting:


Hardware: MP trash can, 8 core GPU, 32GB RAM, AMD D700 GPUs, Gtech 8 TB Thunderbolt drive read/write.

Software:  OS X El Cap 10.11.4, MC 8.5.2

Sequence:  1080p 29.97, containing mostly 4K FS-7 (XAVC-I) talking heads shot over green screen, reframed, color graded & keyed over 1080p moGFX BGs with some text builds imported from 1080 P'shop layered files (up to 8 layers**).  I removed all renders before the tests. 

Sequence duration 5:50.

Export A:  QT DNxHD 145 (no mixdown), export time 7:15, so about 20% longer then real time.
(Exporting at DNx220 took 7:30, only 15 seconds longer)

Export B:  Mixdown seq. video to DNxHD 145, time 3.45
 Export QT SAS, time 2:35
 Total time 6:20.  

Add in the time to dupe the sequence, cut in the mixdown and delete the original video tracks, and Exports A & B take about the same amount of time.

I have used Export A on lots of complex timelines with no issues.

Incidentally, watching Activity Monitor, the Avid doesn't appear to use more then about a third of the CPU power when exporting, and about 2/3 of the CPU when doing a mixdown (don't know how much is being handed off to GPUs in either case).  

When I use Premiere or Adobe Media Encoder, the Activity Monitor shows all 16 (virtual) cores nearly pinned.  Score one for Adobe.

Hope this helps.

- Rich

**In Avid, with a foreground track of 4K XAVC-I with reframing, color grade and GS keying over moGFX and with 5-6 layers of Photoshop titles on top, and a couple of audio tracks using track processing, my rig will play at full res (green video quality) including through an AJA T-Tap to a client monitor in real time with no sweat. FWIW.


On Feb 16, 2017, at 12:47 PM, Greg Huson Greg@SecretHQ.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:


We're still using cheese graters- but video mixdown has been the way to go for some time now- much, much faster.   Then export same-as-source and that's usually faster than realtime.  Be sure to set your contrast correctly in the export settings.

Exporting un-mixed-down video uses the QuickTime engine which is ancient now.  

________________________
Greg Huson
Secret Headquarters, Inc
Greg (at) SecretHQ.com

On Feb 16, 2017, at 12:22, Lou Wirth loutv@mindspring.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

 

So I have moved on from the MacPro 2009 and decided to go with 4 year old technology rather than 9 and got a late 2013 model Vader mac. Sonnet box works great for Avid card, all drives and hubs working fine. Running MC 8.6.5 and all very responsive and renders are quick.
But….
Exports are taking forever if they go at all. I have a 9 minute sequence DNX 220. Normally in the old days (about five weeks ago) It would export to any drive and take a few minutes at most. Now that same sequence runs 20 minutes and still is only 70% done. Often I get a failed error. 

Anyone run into this on the newer macs or when using SATA and thunderbolt drives?

Resorting to mixdown and will try that to see if I have any luck. QT reference won't work because I used AMA media which was all transcoded but doesn't seem to matter to Avid.

thanks 

Lou
Lou Wirth Productions
500Tamal Plaza, Suite 522
Corte Madera, CA 94925
www.louwirth.com
415-924-9411p



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