Our supportteam has confirmed that that a 720P24 DVC PRO 100 generated with the very same settings as a Quicktime Movie from Final Cut Pro 5 is working and can be encoded with Compression Master 3.1.2.
Your problem can have several reasons, one is the naming convention, another might be your Quicktime and OSX version as well. How was your file generated / supplied to you?
We used QT 7.02 , FCP 5 and Tiger OSX 10.4.2
We know however that HDV 24P is not yet supported by Quicktime and therefore will not be supported by Compression Master 3.1.2 since we are using the same QT importer.
If you have any further problems do not hesitate to contact our support team,
All best /johan skaneby , Popwire