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Ah, i think i see what you mean; If you cut one video in half and put one piece of it on top of itself (on second track) and make two overlap, (like I did in 0000504) and then turn bg render over this region - it will be slow .... But I think it will be slow because underlaying calls to source media for some reason become slow, background render over simple one track is fast (but I agree not very interesting, apart from fast seeking, and fast forward/reverse playback) |
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as reference point on AMD FX-4300 with this video video1 h264 1280x720 30.00 pix yuvj420p color space:bt709/ range:pc 2315+0 frms 77.16 secs 0:01:17.16 and jpeg-100% quality CinGG (git) renders timeline (rgba-8bit) in just 45 seconds. (with brender files on tmpfs) and around 8 mins for this video1 h264 1920x1080 59.94 pix yuv420p color space:bt709/ range:tv 12999+0 frms 216.86 secs 0:03:36.86 I think all I saw all four cores already loaded, amy be not to 100% but to 75% for sure. |
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Just as illustration, I found video on Youtube where Adobe Premiere CS4 (from 2009) renders transitions and sometimes whole timeline ...well, sometimes it takes up to 5 minutes :} https://www.youtube.com/watch?v=7BjfdF1cuM0 ("Introducing Adobe Premiere Pro CS4: Basic Video Editing Tutorial" - at 5:55 you can see rendering time for 720p 25 fps project with 2048 frames is 5 min!) |
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The best way to take advantage of multiple CPUs on your computer is with enabling Render Farm in the Settings->Preferences, Performance tab since you already have "Background Rendering" enabled, using multiple CPUs helps a lot. The down side is that when you do File->Render you may want to remember to turn it off --- or not! GG frequently enables the Render Farm for his 128 CPU Epyc computer to render a 2 hour movie in just a few minutes. However, if you are using Background Rendering to speed up Transitions, I will update your BT on that to let you know that GG is testing code which may not work to speed them up. |
- Anonymous
