Problem combining multiple mp4 files in quicktime

I'm trying to combine three mp4 files (about 70 MB each) into one video file. I read that quicktime could do this rather easily. Sure enough, after opening one mp4 I can simply drag in the other two after it.
Next I can either close the file, which will prompt me to save the new video, or I can export the video. Either way, the initial time estimate is 2 minutes... then 4 minutes, 6, 9, etc. This goes on indefinitely and the increment of time added increases as well. The first time I tried to combine the three mp4 files I left QuickTime to save the video and when I checked back it had an estimate of over 200,000 hours left and was increasing at 16,000 hours every couple seconds.
Seems like this is a bug of some kind but I don't have a clue how to trouble shoot this. Any ideas?
Thanks,
Brandon

I still don't know what's wrong with QuickTime, but this program combined the mp4 files quick and easy:
http://www.mp4joiner.org/en/

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Hi, I'm new to apple discussion forum, I have been searching for answer to my problems but couldn't find the resolution.
I have dozens of MP4 files which plays well on Quicktime on my other systems running XP-Pro. Recently I transferred my mp4 files on a portable drive and I wanted to open them up on a system which has 64-bit Vista. I can open all the files within iTunes without a problem (although it had to install files within iTunes first) but the same mp4 files won't run on Quicktime.
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Hi.
Yes, I have the same exact problem. Running pretty much same Vista 64-bit system. When I double click to run a mp4 file I keep getting that same error -43: file not found. The video plays fine through iTunes but won't run at all through Quicktime (outside of iTunes).
Hope someone can come up with an answer or Apple puts in fix.
For now I set iTunes to be the default program to open for this file type but would it rather have remained Quicktime.
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How do i combine multiple pdf file into a single pdf file?

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RealPlayer 10 for Mac from http://forms.real.com/real/player/blackjack.html?platform2=Mac%20OS%20X&product= RealPlayer%2010&proc=g3&lang=&show_list=0&src=macjack
Flip4Mac WMV Player from http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx (Windows Media Player for the Mac is no longer supported, even by Microsoft)
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Problem combining multiple mp4 files in quicktime

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