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Gradual slow down in rendering with simple timeline in Vegas Pro 10 x64
Hi people,
I’m having trouble re-encoding a 1 min. AVC video clip into a FFV1. The problem is; renderin takes more than 10 mins.
Project timeline is 640×480 29.9 fps, has no effects, contains ~10 simple cut edits, no transitions, even Smart Resample is disabled, only 1 video track, no audio.
Source video is .264 file, AVC (H.264 Bitstream) with no audio, 640×480 29.9 fps.
Target file is 640×480 29.9 fps FFV1 with no audio.The weird part is the rendering progress starts fast and gets slower in time eventhough there is no effect applied etc.. Mem usage is below 100 MB.
Progress(%) – Time (seconds)
%10 —- 14
%20 —- 35
%30 —- 70
%40 —- 147
%50 —- 242
%60 —- 320
%70 —- 416
%80 —- 520
%90 —- 635
%100 —- 784At the beginning, time for %1 progress is 1.4 sec.
At the end, time for %1 progress is 7.8 sec.Any ideas why does this happen or suggestions to fix this?
edit: System is Win 7 64x , Core i7 960, 6 GB RAM
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4 Replies
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Search for the message “render crawl”. Try it out and let us know what happens.
Jeff
http://www.narrowroadmedia.com
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Thanks for the response. I’m not on my machine now, iirc, preview RAM was set to 350 MB. I’ll try setting it to a lower (or zero) value and test it as I get back home.
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I tested it again with RAM preview set to zero and render time dropped from ~600 secs to 51 secs.! 😀 Thanks Jeff.
Someone should tell this to Sony guys so they can advertise new Sony Vegas Pro 11 with a tagline such as “%1200 rendering performance improvement” 😛
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Omer,
Thanks for confirming my findings. I believe it has something to do with where in memory the dynamic RAM is allocated. I don’t have time to research it though.
Jeff
http://www.narrowroadmedia.com
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