Problem Converting AVI (DV) to MOV (DV)

I have a number of AVI (DV) files that were previously imported on my PC, which I want to covert (using my Mac) to the more Mac friendly MOV (DV) file format.

I read that the best way to achieve this is to open the AVI files in Quicktime Pro and to convert the files to MOV using “SAVE AS”, as opposed to “EXPORT”. I understand that the benefit of using “SAVE AS” is that there is no recompression of the DV stream and that only the Container is changed (which results in a lossless conversion).

The problem is that the new MOV (DV) file is significantly larger than the original AVI (DV) file. For example, the size of a 13.5 minute clip increases from 2.95 GB to 5.88 GB.

I wouldn't expect such a significant change in file size if only the Container is indeed being changed.

I have also tried MPEG Streamclip to do the conversion, but I get the following message when I try to open the AVI (DV) file “File open error: this movie file is not supported”.

I have confirmed using Gspot that the AVI (DV) file is a 'Type 1' as opposed to a 'Type 2' file. Gspot also indicates the following information about the file “Multipart OpenDML AVL (3 parts). I don’t know if this is relevant.

Any advice would be greatly appreciated.