On my latest Red shot 4K project I did some testing on transcoding to DNxHRHQX on my work system. A mac pro Tower mid 2010 OS 10.9.5 upgraded to 12 core 3.33GHz 24GB of ram Radeon 5770 GPU Avid 8.5.2. On that system the clips transcoded at 5.6 times real time. So a 40 minute clip took around 4 hours to transcode. When I looked at the Activity monitor the CPU usage for the background transcode dithered around 450%, so around 4 and half cores. When I tried a normal foreground transcode the CPU usage was around 550%.
I took the drives home to my system a mac pro tower mid 2012 OS 10.9.5 12core 2.66GHz 64GB ram nvidia GTX 680 Avid 8.5.3. Doing a foreground normal transcode on my home system the CPU usage is dithering around 2,100% so about 21 cores. Avid projects the first clip will be done in just over an hour so that seems to be a lot faster than at work.
At work the source and target drives were connected USB 3 hooked to the same card. At home the source drive is connected to USB 3 but plugged into the Mac Pro Tower front USB 2.0 port and the target Graid drive is hooked to an Esata port that is part of my PCIe SSD drive in slot 4 4lane on the Mac Pro.
I have seen my work system crank up to 2,000 percent ish cpu when transcoding Panasonic Varicam 35 4K AVC-Intra but this is the first time I've worked with Red in a 4K world.
So why is my home system cranking sooo much faster?
I read parts of Paul Sampson's Red Workflow Avid guide and it said that with a Red Rocket card Avid can be set to full debayer quality and the Red Rocket will kick to provide about 2 times realtime Red Raw transcode. My home system seems to be outperforming that with 4K material. I'm curious why there is such a performance difference between the two seemingly similar systems.
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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