Sony CMU .mt2s MVC File Splitting Issues

3d-camcorder-sonyAs a user of the Sony NX3d1 Stereoscopic 3D Camcorder one of my continuing bugbears has been having to use the Sony Content Management Utility for copying over files in order to retain the ability to actually use this to split the .mt2s MVC files into separate Left & Right video streams.

One of the recurring problems has been the process of splitting should a file be renamed – it simply breaks. In order for me to work on the 3D version of our new short “Hidden” I faced a major problem. I hadn’t briefed the editor not to change the file names – he had been meticulous in using the Sony CMU to copy over the files as briefed, but as he hadn’t been warned so all the file names were changed to match the take numbers… and oops there goes the ability to split the files!

Faced with this issue I had to research my options. So first off I headed over to and tried out the MVC to AVI converter. Great news is this worked perfectly however there were only a limited range of codecs supported for the output and this ended up blowing file sizes through the roof – files that started as 200MB converted with uncompressed AVI settings rather obviously became GB’s. I do appreciate this is the best approach but it is steep in terms of storage taking the relatively small MVC’s to such huge AVI’s.

So back on to the drawing board I wondered what the actual “.cmuprops” files actually contained that disrupted the conversion. I opened up a “.cmuprops” file in Notepad and it just looked like a bunch of XML “stuff”. So I wondered what if I just rename this file – even if it isn’t the exact matching file for the video if it would work… and it did! Yeeha – any of the .mt2s MVC files converted as long as there was an XML file that matched the name.

So in simple terms as long as you have one of the “.cmuprops” files just rename it to match your .mt2s file from the camera and the Sony CMU will split it. Nice (if somewhat painful that Sony couldn’t have warned or made a piece of software that didn’t require this step).

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