Black thumbnails for video files

hi, i'm having problems with black thumbnails showing up in iPhoto 06 for mp4 video files
mpeg files work fine, and the same mp4 files actually work in iTunes (meaning iTunes generates a correct thumbnail but iphoto thumbnails are black)
does anyone know how to correct this?
thanks very much

thanks larry. when i open in quicktime and go to the first frame, it is not black. also, for some reason, when i import the movies into itunes, the thumbnails show up fine (i.e. no black frame). i'm guessing that it has something to do with how iPhoto generates the thumbnail (vs. iTunes), but i don't know enough to change these settings.
if the first frame is in fact black, do you know if there is a way to force iphoto to use something other than the first frame when generating thumbnails?
thanks very much.

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thanks larry. when i open in quicktime and go to the first frame, it is not black. also, for some reason, when i import the movies into itunes, the thumbnails show up fine (i.e. no black frame). i'm guessing that it has something to do with how iPhoto generates the thumbnail (vs. iTunes), but i don't know enough to change these settings.
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thanks very much.

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Elements Organizer 11.0.0.0
Core Version: 11.0 (20120923.r.32287)
Language Version: 11.0 (20120923.r.32287)
Current Catalog:
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Catalog Location: C:\ProgramData\Adobe\Elements Organizer\Catalogs\My Catalog\
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Catalog Cache Size: 578.7MB
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Operating System Name: Vista
Operating System Version: 6.0 Service Pack 2
System Architecture: Intel CPU Family:6 Model:7 Stepping:7 with MMX, SSE Integer, SSE FP
Built-in Memory: 3.9GB
Free Memory: 905.8MB
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Adobe Reader Version: 10.1
Adobe Acrobat Version: Not installed
CD and DVD drives:
E: (HL-DT-ST DVDRAM BUS: 1 ID: 1 Firmware: GH24LS50)

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Black thumbnails for video files

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