Mar
22

Capture Screenshots of DVDs and Video Content

hd_none.jpgIn my last article on the freeware review, I wrote about automatically saving multiple screenshots with smartision ScreenCopy. Try using this program with video. When I was trying to save a screen shot of one of my DVDs for my desktop wallpaper, I captured the entire screen … sans the actual video. Even when I tried pressing the manual “Print Screen” button on the keyboard I got the same result as I pasted the data in IrfanView.

Why is that? I can never dump the screen of any video content? My first response was that it was a copy-protection mechanism, sort of like DRM. But the real, underlying problem was the way my media player rendered the video content.

 

CPU and GPU Rendering

Windows renders most onscreen GUI with the CPU since it doesn’t tax processing power so much and because it is more compatible with most video cards. But when video or 3D content needs to be displayed, Windows switches the area of the display to hardware acceleration mode. Everything displayed in that space is processed with the video card GPU (graphics processing unit). GPUs specialize in efficient graphics processing so that video moves smoothly without slowing down the computer. With Windows unable to access the graphics of the particular space the video occupies, it leaves the area blank when taking a screenshot.

Disable Hardware Acceleration

hd_wmp.jpgIf you were to instruct Windows to pass the video data to the CPU instead of the GPU, then the entire monitor display can be rendered in a screenshot. The process is easy. Just disable any “hardware acceleration” in the media player. Below are instructions for Windows Media Player.

  1. Click “Tools” from the top menu.
  2. Click “Options.”
  3. Click the “Performance” tab.
  4. Under “Video Acceleration” move the slider to “None.”
  5. Click “OK.”
Before
hd_none.jpg

After
hd_will.jpg

Most other multimedia players like QuickTime and RealPlayer have similar options. If you own an older computer, this may slow video playback substantially. But, you’ll still be able to obtain a decent screenshot. When you’ve captured that perfect screenshot just enable hardware acceleration again.

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2 Responses to “Capture Screenshots of DVDs and Video Content”

  1. Puddy Says:

    Alternatively install any other video player
    (winamp, VLC, real, doesnt matter)

    now start the movie from which you want a screenshot
    now start another movie in another video player

    now press print for a screenshot

    you will notice only one of the 2 videos is "black" 😉

  2. blogger Says:

    Wow thank you for your suggestion. I just tried it and it works. Its like when you have it on at the same time then hardware acceleration cancels for one of them (usually the one opened the last).

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