virtualbox.org

Hi,

I have Windows 8.1, 16gb ram, Intel core I7 3630QM - 2,4 GHz, intel hd 4000 + nvidia gt750m graphic cards on my host computer. I downloaded from kdenlive website image of debian + kdenlive video editor. I gave 8gb ram to guest computer, 128 to video card and enabled 4 cores in processor tab. Guest additions are installed and 3d acceleration enabled. Evrything is running fast and quick but when I try to play 1080p viedo from my gopro camera, the cpu increases usage to 100% and video is very choppy and stutters. I tried to play video using vlc, totem and other players but no success. Is there any solution? Shouldn't such powerfull config play 1080p smoothly?

Thanks for any help.

It's a VM - high performance is not the point. And anyway some of the things you did - excessive vram, excessive CPU count - are unlikely to help. With full hd video the bottlenecks will be shifting the data, and decoding the video stream. Those sort of things can be accelerated by a GPU, but the VM doesn't have one. Accurate timing may also be a problem for a VM, since it has no access to independant fast real time timers. How is the VM accessing the video data anyway, i.e. what's the connection bandwidth?

Did you try the VM with just two virtual CPUs, so that the host still has free CPU cores for I/O ?

How is the VM accessing the video data anyway, i.e. whats the connection bandwidth?

What do you mean? File is directly copied to the VM file system.

Did you try the VM with just two virtual CPUs, so that the host still has free CPU cores for I/O ?

Yep, I tried every configuration.


So there is no way to find workaround of this problem?

This is not a problem. It is expected behavior. As mpack said, virtual machines will never be as powerful as the host, but mostly on the video side. So no, there is no workaround. What you can do is wait, pray or pay for better and improved guest additions.

Ok, thanks for the answers.
For me this is definitely a problem even if it has no solution. And I don't think that praying will much help in this case. I have to start looking for some windows video editor.