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Author Topic:   White lines when using MP4 files
gbradt
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Posts: 4
Registered: Dec 2008

posted 12-02-2008 05:30 PM     Click Here to See the Profile for gbradt     Edit/Delete Message   Reply w/Quote
Hello, I just purchased the Personal version of iScreensaver. I'm using Mac OS 10.5.5 (Intel) to create and use the screensaver. My Quicktime is 7.5.5.

I'm creating screensavers from small MP4 files (<3 MB). I'm using proportional mode because it seems to look and perform best. It looks fine when I use Full Screen Preview before installing.

However, after installing, I get a thin white line along one edge of the image. If there's black space along the top and bottom of the screen (the image fills the screen horizontally but not vertically), the line is along the bottom edge of the image. If the black space is on the left and right, the line is along the right edge.

I can convert to another file type besides MP4, would that help?

Thanks.

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iScreensaver Support
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posted 12-08-2008 06:31 PM     Click Here to See the Profile for iScreensaver Support     Edit/Delete Message   Reply w/Quote
We do use a slightly different method of playback for the built screensavers, so it's possible there is a logical reason for the difference. I wouldn't expect the codec (MP4 or other) to matter. However, if the codec does change the behavior, this would suggest a bug is in fact in QuickTime, not iScreensaver.

Did another codec help?

Can you capture a screenshot of the misbehavior?

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gbradt
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Registered: Dec 2008

posted 12-09-2008 05:00 PM     Click Here to See the Profile for gbradt     Edit/Delete Message   Reply w/Quote
Thanks for your reply. I tried it with a .mov file, same problem. Here's a screen capture:
http://homepage.mac.com/gbradt/saver.jpg

The movie background is all black. The white line is between the edge of the frame and the black area filling in the right side of the screen. It's also visible when the movie doesn't have a black background, but this makes it easier to see.

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iScreensaver Support
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posted 12-09-2008 06:07 PM     Click Here to See the Profile for iScreensaver Support     Edit/Delete Message   Reply w/Quote
That is odd. I'm wondering if there is something odd about the movie file? Can you please email us a copy of the movie (or, better yet, the movie + the .lSC project file) zipped, to support@iscreensaver.com ? thank you

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iScreensaver Support
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posted 12-12-2008 08:15 AM     Click Here to See the Profile for iScreensaver Support     Edit/Delete Message   Reply w/Quote
Thank you for emailing us your project file.
We have done testing, and confirmed the white line -- this appears to be a bug either in iScreensaver, or in QuickTime, we are not sure yet.

Good news: the bug appears to be triggered by having an odd sized movie file. Your movie file is 633x480 in size. Many computers don't deal well with odd-width movie files. So, the quick & easy fix is to resize your movie to a more conventional size (640x480 is the standard 4:3 aspect ratio size that you probably intended?)

You can do this in about a minute:
* Open the movie file in QuickTime Player
* Choose "Export" from the File menu
* Choose Export: "Movie to QuickTime Movie"
* Click "Options..."
* Click "Size"
* Choose "640x480 VGA" from the popup.
* Save your movie file as a new file.

Then, in iScreensaver:
* Re-select this new file, re-build, and re-install.

Please let us know if this works?

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gbradt
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Registered: Dec 2008

posted 12-14-2008 06:02 PM     Click Here to See the Profile for gbradt     Edit/Delete Message   Reply w/Quote
I don't have Quicktime Pro, but I was able to save as 640 x 480 with MPEG Streamclip. Now I have a green line! I'll send you the files.

Thanks for looking into this.

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iScreensaver Support
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posted 12-15-2008 08:01 AM     Click Here to See the Profile for iScreensaver Support     Edit/Delete Message   Reply w/Quote
Hmm even more interesting. WIth the second movie you sent us, it is indeed 640x480, however now we see the green line, not only in iScreensaver, but also in QuickTime player. (to test, open quicktime player, and choose "Enter Full Screen" -- again, this may require QuickTime Pro, which you can get from Apple for $29, and is a worthy investment).

So, at this point, I'm guessing that perhaps the bug is in the program MPEG Streamclip? My guess is that it's not outputting a 100% legal movie file, and this is why the green line is showing up.

Solution: I would recommend that you go back to the original source file, and try to use a different program to do the format conversion. QuickTime Pro, for $29, is not a bad investment, it will quickly pay for itself. http://www.apple.com/quicktime/pro/

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gbradt
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Registered: Dec 2008

posted 12-20-2008 01:06 PM     Click Here to See the Profile for gbradt     Edit/Delete Message   Reply w/Quote
Problem solved! I created the original movie from a DVD with Handbrake, so I was able to go back to Handbrake and make a new movie with the aspect ratio at 640x480. Now the screensaver looks fine.

Thanks!

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