Screen Flicker when IDVD rendered project

I have an Imovie HD composed of quicktime screen clips from SnapzProX. Movies are captured at 15-24 frames per second. When I view the preview, everything looks great. I export the entire project to a quicktime movie and it still looks great. I export the project to IDVD, and the project looks great except for 1-2 minute clip. In this clip, the screen begins to flicker and the image appears to be low resolution. I checked the original movie and it looks and plays fine. It has not had any effect applied to it as well. If everything renders fine in the other formats (DIVX works well too) why is my IDVD project crapping out. And moreover, why is it just this single segment. All of the other QT movies captured and rendered flawlessly. My project is done, but I can't let this problem go out like it is...Thanks for your help in advance...

Thanks for the response but I really can't see this as a resolution issue. All of the screen captures were captired at 1024 x768. So if anything , they would be scaled down. But once again, if that were the issue, then they should all flicker since they were all done the same. This project is 13 minutes long and only one small clip flickers. It seems to do it when the screen I captured contained a push down box. In the capture, when I scrolled down the push down to make a selection from a list, everything after the selection begins to shake. It's really annoying and quite puzzling since there are other places in the movie that do the same thing, and the flickering does not occur. And moreover, when I render the entire movie as quicktime, there is no flicker...only when I transfer to IDVD...go figure...

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ID                                       : 1 (0x1)
Complete name                            : C:\Users\Richard\Videos\Movies\Richards 50th Birthday\00014.MTS
Format                                   : BDAV
Format/Info                              : Blu-ray Video
File size                                : 44.8 MiB
Duration                                 : 14s 335ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 26.2 Mbps
Maximum Overall bit rate                 : 28.0 Mbps
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General
Complete name                            : E:\c1969-1-01.avi
Format                                   : AVI
Format/Info                              : Audio Video Interleave
Format profile                           : OpenDML
File size                                : 2.68 GiB
Duration                                 : 21mn 26s
Overall bit rate                         : 17.9 Mbps
Video
ID                                       : 0
Format                                   : JPEG
Codec ID                                 : MJPG
Duration                                 : 21mn 26s
Bit rate                                 : 16.3 Mbps
Width                                    : 1 280 pixels
Height                                   : 720 pixels
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Frame rate                               : 16.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Bit depth                                : 8 bits
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Audio
ID                                       : 1
Format                                   : PCM
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ID                                       : 4113 (0x1011)
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Bit rate                                 : 24.9 Mbps
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Chroma subsampling                       : 4:2:0
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Audio
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Mode extension                           : CM (complete main)
Format settings, Endianness              : Big
Codec ID                                 : 129
Duration                                 : 14s 432ms
Bit rate mode                            : Constant
Bit rate                                 : 256 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossy
Delay relative to video                  : -40ms
Stream size                              : 451 KiB (1%)
Text
ID                                       : 4608 (0x1200)
Menu ID                                  : 1 (0x1)
Format                                   : PGS
Codec ID                                 : 144
Duration                                 : 13s 856ms
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