Today I had ProResHQ Raw files logC from an Arri Amira camera. On our 12 core MacPro circa 2012 2.66GHz with a nVidia GTX-680 hooked firewire800 to a Graid drive with the source files and rendering Avid media with an Arri to 709 LUT applied it took 4.5 hours to render a 6 camera stage shoot. According to the ticker on Resolve it was rendering out at about 35 to 40 fps flickering up and down on the rate. After my transcode was done I set up the same render only this time the source was the same Graid hooked with firewire 800 but I changed the destination to an external 8 drive raid enclosure connected by Esata. This render was clocking at 96 fps and the estimated time was right around 2 hours, more than twice faster. Of course going to a different drive raid with Esata made the difference. I'm curious if my source drive was also Esata or something else would I see even faster rendering? I've read on the Avid L2 how sometimes being on different busses in the computer makes a difference too. This mac pro Esata is on a pcie card and it has two outputs. I'm wondering if I had the Graid source also connected to the 2nd Esata connection on the same card as the external Raid if that would hinder the throughput as the two connections would certainly be on the same buss if they are connected to the same card?
Given I was able to get better than 3 times real time going to the external drive and the AE told me the ama linking and transcoding usually went around real time I'm curious what others have experienced. I know Avid is optimized for transcodes so does anybody have a ball park render estimate of how fast Avid would take Arri Amira ProResHQ logC raw files and transcode to dnx220? Would it be anywhere near 3 times real time. I had to get the job done and didn't have time to experiment with the Avid ama transcode times.
John Moore
Barking Trout Productions
Studio City, CA
bigfish@pacbell.net
Barking Trout Productions
Studio City, CA
bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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