Keynote Won't Play video on presentation

Hi,

The thing is that I have never had Perian on my system, but also shared this problem it seems with quite a few others. I was waiting for an update to resolve the issue but the "Allow Expose, Dashboard, and others to use screen," under preferences fixes the problem completely. So, for anyone in the same situation, give that a try.

Same bug.
Installed Keynote 4.01 on MacBook Pro, Tiger, Quicktime 7.3.0
Older keynote presentation that plays fine on G5, Tiger, Quicktime 7.3.0 and Keynote 1.1.1
doesn't play any quicktime movies in presentation.

Setting Enable Expose is the only thing that seems to help.

Dear Edwardsean

You are my hero. Your solution works. Thanks a million. How did you get the idea in the first place? I have lost many hours trying to solve the problem.

Checking "Allow Expose, Dashboard, and others to use screen" in the preferences of Keynote has not slowed down the presentation in spite of the warning below the checkbox, at least not over what Keynote 4 has slowed it down already compared to Keynote 3.

The problem is solved, see

http://discussions.apple.com/message.jspa?messageID=5809442#5809442

An official bug fix by apple would be kind of nice just the same.

You guys are amazing. I found myself in the same situation this week.....important keynote presentation, a youtube video i wanted to use, could only get blank screen. Should have searched this discussion board cause now it is solved. Amazing. I am so happy.

DivX, MPEG 2, muxed or demuxed video, WMP etc., all work fine. *If you are in inmediate need*, use these formats. The screen controls also work beautifully with these formats.

It is clear that *MPEG-4 with or without H.264* does not work well. QT Movies do not display

Will try what is advised further down in these discussion, that is, deleting all QT files & preferences and re-installing. Will let you know outcome

I had same problem but not as lucky to find the solution in time. 10 physicians paid good money for me to teach them ultrasound for two days. First time Mac has let me down in 7 years. I ended up basically doing charades and looked/felt like a *******. That night I found the post regarding converting it all to WMVs,and then spent 5 hours converting all my videos to WMV (which seemed to cut off the last 25% or so of each clip). Only after the course was over was the post regarding the expose fix - many thanks to the person who discovered the fix - just wish I had found this before I wasted 5 hours. Of course all my QT videos work now so I'm deleting all the WMVs I needlessly made.

In the end I guess I should have known better and checked to make sure all the presentations ran after updating to a new OS before going in front of an audience...

removed perian, but had to reboot before I got movies to play in keynote

I had exactly the same problem as others: qt movies in iWork 08-Keynote wouldn't play, screen would go black, display would freeze etc. At the same time, the same presentation would work fine on the same machine, with QT 7.3 and Perian 1.0 installed, in iWork 06-Keynote. (Which makes it clear that QT 7.3 is not the culprit.)

The solution is simple: in Keynote 08 go to "Preferences", select the "Presentation" tab and turn ON the option "Allow Expose, Dashboard and others to use the screen"

After turning this option, everything is running fine again! However, it is strange enough, that this option must be turned on at all for making qt movies inside a presentation work again.

"Allow exposé..." works!!! Thanks SO much for this—I had a very embarrassing performance this morning when my video did not show, but at least I know that it will work now. I had perian installed as well, but uninstalling it does not seem to have made a difference.

I can confirm that removing Perian fixes this issue:

1 - First I disabled Perian using the Perian control panel.
2 - Next I removed the Perian Preference Panel from /Library/PreferencePanes.
3 - Then I repaired my disk permisions (just for good measure).
4 - Last I restarted my MacBook & suddenly my Keynote videos worked again!

I didn't have to reinstall Quicktime or do anything else.

Nope, Allow Expose..." doesn't help with MBP 15", latest Keynote and QT, w/ or w/o Perian. QT movies don't work properly, nor do some .mov. Clearly a problem here.

Same problem here.
Config: Macbook, Tiger 10.4.11, Keynote 4.0.1, Quicktime 7.3.0, Perian 1.0
Solution: uninstall Perian 😟
As I understand, Apple should fix this, right? I don't like the solution of "letting expose and other apps access the screen", since I could mess up with Expose while presenting, and I don't want to disable it manually every time I have to give a talk...
So I just tried uninstalling Perian as suggested, and it worked for me. I just clicked on "Uninstall" from the control panel. No reinstalls.

Allow Expose no longer works for me either. When is this going to be fixed, Apple? Our livelihoods depend on this! 😟

I just wanted to highlight what you said because it worked...

Going to Keynote Preferences>Slideshow>Allow Expose to use screen
fixed the problem.

I do hope Apple updates Keynote or Quicktime soon though to fix this problem.