Encoding Speed of CFHD AVI at DVinfo.net

Matt Vanecek · June 17th, 2009, 06:51 PM

I'm sitting here trying to prep a test project for a trouble ticket I have open, and noticed something. I cut out about a minute from a longer clip, where the longer clip has an associated First Light profile. When I export that 1 minute clip to a CFHD AVI, the export takes about 6 minutes. No other effects aside from the First Light profile.

When I bring that 1 minute export back into Premiere and monkey around with getting my test export setup, and then export the 1 minute clip again (this time, NO First Light, and no other effects), the 1 minute export takes about 2.5 minutes.

In this instance, it seems that the clip without First Light attached took a much shorter time to export and used a good 55% of the CPU, while the clip WITH First Light took a long long time (relative to clip length), and only sucked up about 15% of the CPU.

Is this expected behavior when rendering out to CFHD AVI from CFHD AVI? Or could the First Light linkage be the reason that Premiere Pro appears to be starving the CF encoder engine?

Thanks,
Matt

David Newman · June 18th, 2009, 08:57 AM

Everything sound right expect for the CPU % numbers. A First Light enhanced clips do have more work to do, and that will mean a little longer rendering (although faster than adding the equivalent filters) and MORE cpu usage (not less.)

Matt Vanecek · June 23rd, 2009, 10:12 AM

Is there anything I can do to find out why the CPU usage is so low when rendering First Light-enhanced clips?
Thanks,
Matt

David Newman · June 23rd, 2009, 09:00 PM

Have support reproduce this.

June 17th, 2009, 06:51 PM	#1
Matt Vanecek Major Player Join Date: Jul 2005 Location: Denton, TX Posts: 334	Encoding Speed of CFHD AVI I'm sitting here trying to prep a test project for a trouble ticket I have open, and noticed something. I cut out about a minute from a longer clip, where the longer clip has an associated First Light profile. When I export that 1 minute clip to a CFHD AVI, the export takes about 6 minutes. No other effects aside from the First Light profile. When I bring that 1 minute export back into Premiere and monkey around with getting my test export setup, and then export the 1 minute clip again (this time, NO First Light, and no other effects), the 1 minute export takes about 2.5 minutes. In this instance, it seems that the clip without First Light attached took a much shorter time to export and used a good 55% of the CPU, while the clip WITH First Light took a long long time (relative to clip length), and only sucked up about 15% of the CPU. Is this expected behavior when rendering out to CFHD AVI from CFHD AVI? Or could the First Light linkage be the reason that Premiere Pro appears to be starving the CF encoder engine? Thanks, Matt

June 18th, 2009, 08:57 AM	#2
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	Everything sound right expect for the CPU % numbers. A First Light enhanced clips do have more work to do, and that will mean a little longer rendering (although faster than adding the equivalent filters) and MORE cpu usage (not less.) __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

June 23rd, 2009, 09:00 PM	#4
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	Have support reproduce this. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

June 23rd, 2009, 10:12 AM	#3
Matt Vanecek Major Player Join Date: Jul 2005 Location: Denton, TX Posts: 334	Is there anything I can do to find out why the CPU usage is so low when rendering First Light-enhanced clips? Thanks, Matt