Why do FCP X and QT Player 10 only see the audio content of these files?

Using FCP 7  I converted 20  VHS tapes to DV PAL,  some with  a Datavideo DAC 100 and some with my  Canon HV20 camera's A - D conversion facility.
All the videos play perfectly in QT Player 7 although for some reason 5 of the files have generic QT icons and behave like  audio-only files when played in QT Player 10. (The OK files have a poster frame type appearance)
I  can't remember which converter created these 5 videos but a VideoSpec analysis reveals no difference between these and the "good" ones.
When imported into FCP X these 5 appear as green "audio-only"  files in both the Event Browser and Timeline.
I have found a workaround  .  .  .  .   simply open in QT 7 and  "Save As"  produces new fully functional files  .  .  .  .  but it doesn't explain what caused the problem.
Any ideas?

Please disregard this posting.  I took the old file and ran it thru compressor in a 422 format and now everything works fine and only took about 10 minutes per hour of video.  I don't know how to cancel a request and I'm really pressed for time.  Thank you.

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