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CPU usage while rendering video

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Hello since Media Encoder is under Premiere.

 

Haven't done video editing in years.  So after some talk with friends tried to do it. Tried raptr GVR filmed a video and it was 2Gb big (23min). Well 6-8 years ago that was too big and so I tried to use  win movie maker to make it smaller and couldn't... raptr build in editor to upload to Youtube and file went from 2 to 1Gb since I think  it's still too big I used Fraps to remake the video. I could edit it and got it to 330Mb but quality was bad, than I asked what program a friend was using, and she said Adobe Element.. so after some time I got Adobe Media Encoder it was sudgested as easy and fast video encoder.

 

and Here comes the questions:

1) Why video rendering is taking about 3h to render 2.2Gb wma file to make it HD 720p 29.97  with H.264 codec? CPU is loaded only 16-20%, have alot of RAM. Ou and tried both OpenCL and system only renderer no change in time needed or CPU load.

2) Does Mercury Playback Engine GPU Acceleration (OpenCL) means GPU usage mostly and system only - CPU usage?

3) Why is so low CPU usage I thought that doing something big like video editing CPU should be fully loaded..., but here I see that it as I said is using only 16-20% and 2-3 cores aren't even in use.

4) Is it ok for a recorded game video to be big like 2-5Gb after rendering in HD format, because I think if  films 44 min HD quality are 350-400MB  than game videos should be about the same.

5) Maybe there is a better video capture app than Fraps, Overwolf, raptr GVR (well looked fine but I couldn't edit the video, Adobe element showed black screen and played audio) so that I could easelly edit it with adobe apps.

 

my PC info:

CPU: AMD FX-8320 3.5Ghz (8 core)

GPU: Asus Radeon R9 270 OC 2GB

RAM: 16Gb

MoBo: MSI 990FXA-GD65FX

Win 8.1 64bit


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