Quick Time Gamma Error in some codecs

Hi,
I have discovered an error with some codecs when creating movies with Quick Time Pro.
Movies created using Apple Pro Res 422 and Pal DV have a significant drop in Gamma.
Can anyone confirm this? and how can I notify Apple of this problem?
Also, this problem does not exist if the movie has been created using Final Cut Pro.
Cheers

Using duo processor G5, storing video on newly Mac
formatted 1TB drive. Imported the first tape from a
Canon ZR850 camera with no problem into iMovie HD
6.03. Put in the 2nd tape with a new project name
and now continually get an error "Quick Time couldn't
parse it -43". I see other errors in the discussion
but not this one. I tried removing the backup
battery, disconnecting all cables and resetting time,
date, etc., but no luck. I then tried to import it
through a Canon GL2, but got same error. I tried
several other tapes that work perfectly well in the
camera but always get the same error. Went through
25 other tapes, so do not believe it is the tapes.
Software is OSX 14.4.9 with 6.5 GB RAM. What am I
doing wrong? Need help.
I did check for plugins but found none.
I used to use iMovie a few years ago an after spending several hours trying to now import the footage remembered that speed compatibility was crucial. My 1 TB drive that I was saving my videos to was running on Firewire 800 speed while my camera was running at Firewire 400 speed. I changed my 1TB drive to run at Firewire 400 speed, and "bingo", it now works.
Thank you however for your suggestions as now I will watch my extra plug-ins as well.

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Using duo processor G5, storing video on newly Mac formatted 1TB drive. Imported the first tape from a Canon ZR850 camera with no problem into iMovie HD 6.03. Put in the 2nd tape with a new project name and now continually get an error "Quick Time couldn't parse it -43". I see other errors in the discussion but not this one. I tried removing the backup battery, disconnecting all cables and resetting time, date, etc., but no luck. I then tried to import it through a Canon GL2, but got same error. I tried several other tapes that work perfectly well in the camera but always get the same error. Went through 25 other tapes, so do not believe it is the tapes. Software is OSX 14.4.9 with 6.5 GB RAM. What am I doing wrong? Need help.

Using duo processor G5, storing video on newly Mac
formatted 1TB drive. Imported the first tape from a
Canon ZR850 camera with no problem into iMovie HD
6.03. Put in the 2nd tape with a new project name
and now continually get an error "Quick Time couldn't
parse it -43". I see other errors in the discussion
but not this one. I tried removing the backup
battery, disconnecting all cables and resetting time,
date, etc., but no luck. I then tried to import it
through a Canon GL2, but got same error. I tried
several other tapes that work perfectly well in the
camera but always get the same error. Went through
25 other tapes, so do not believe it is the tapes.
Software is OSX 14.4.9 with 6.5 GB RAM. What am I
doing wrong? Need help.
I did check for plugins but found none.
I used to use iMovie a few years ago an after spending several hours trying to now import the footage remembered that speed compatibility was crucial. My 1 TB drive that I was saving my videos to was running on Firewire 800 speed while my camera was running at Firewire 400 speed. I changed my 1TB drive to run at Firewire 400 speed, and "bingo", it now works.
Thank you however for your suggestions as now I will watch my extra plug-ins as well.

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