QT crashes with PDF image sequence

Question

A script generates 72 small (ca. 1100 bytes) pdf files as movie frames and I "Open Image Sequence...". The movie, whether saved or not, crashes at a certain point.
All the frame files open without a problem in Preview. By laboriously weeding out the files that cause the crash I end up with a "disabled" folder containing 6 of the original 72 files, so the movie now runs (on the Mac at least) with just the hiccups created by the excluded files.
I next tell QT to open the image sequence containing all the disabled files and, lo and behold, I get another movie that behaves.
Has anybody any idea what might be the problem?
JD

Answer 1

Thank you.
I don't have to use .pdf's. I am trying to find the most direct path from a series of postscript files to a Quicktime image sequence.
Acrobat distiller will convert a series of postscript images to .pdf's with a single "click".
I don't know of a way to do the same conversion from postscript to .jpg's. Preview requires you to convert each image individually, AFAICT.
I'd be happy to go from postscript to .jpg directly if it can be done painlessly.
These are simple .pdf files. I opened one in Acrobat and checked. I am also able to open the individual files with QT and they look as I expect them to.
If you try to open a series of postscript files with Quicktime Open Image Sequence, the .ps files are greyed out. .pdf files do show up as "openable", so it seems like this ought to work.
I have also tried it with QT version 7.1.6 with the same result.