Hi,

I-m trying to create my first 4K (ultra HD) project. I added one single clip to the first video timeline but when I try to run a preview KDENlive crashes. I-m using the version 0.9.10 on Kubuntu 14.04.1 LTS installed on a VMWare virtual machine (I cannot install Linux directly on the HD because it-s my office computer).

I followed thesuggestions with the green background I found on the page https://kdenlive.org/node/872 and:
- I installed FFmpeg. Running ffplay P1030160.MP4 from a terminal I get the error "Error: the video system does not support an image size of 3840x2160 pixels. Try using -lowres or -vf "scale=w:h" to reduce the image size." I tryed also the command "ffplay -lowres 3 P1030160.MP4" but I get the same error
- trying with MLT give me a series of errors like "Non-reference picture received and no reference available
[h264 @ 0x7fd718005000] decode_slice_header error"

There is something I can to to preview correctly my project_

Thanks in advance.
Ruggero

if you're using ffmpeg and ubuntu, where did you get that version of ffmpeg from? you most likely need a very recent version of ffmpeg.

Wow! Trying to process a 4K video in a VM. I am guessing that is really going to be tough. Not from experience. Just a guess.
Can people edit 4K video on kdenlive in a non-virtualised env ?

You do have proxies turn on right ?

In the first VMWare virtual machine I have ffmpeg version 2.4.2. After my first post I discovered that with the -vf option ffplay can show the raw video.

Now I'm testing this Virtualbox image http://sourceforge.net/projects/kdenlive-on-win/ with proxy and it seems to work.

I know that editing witout a VM is better but I'm using a computer of my company and I cannot format it to install Linux natively. I need to wait to have the money to buy a laptop for this purpose.

ttguy wrote:You do have proxies turn on right ?

Yes, with the Virtualbox image http://sourceforge.net/projects/kdenlive-on-win/ and the proxies turned on it seems to work.
Waiting for proxies generation is better than be stopped

That is cool that someone has supplied a virtual box image with Kdenlive. What version of kdenlive is inside the box ? Cool that it works too. Virtualization is really quite an amazing bit of tech!!

ttguy wrote:What version of kdenlive is inside the box ?

0.9.2 but I'll update it as soon as possible.

I'm using the VM, for now it seems work.