Solved! Avid Media Composer 8.5/8 can't see MXF files from Sony PMW-300
The quick workaround to get Sony PMW-300 work with Avid Media Composer 8.5/8 is to transcode PMW-300 MXF to a more editing-friendly format, such a Avid's DNxHD mov. If you're interested in doing likewise, check out the tutorial here.
Source From: Easy Steps to Convert Sony PMW-300 MXF to Avid Media Composer 8.5/8
Q: “At the moment I have no way of importing Sony PMW-300 MXF files into Avid Media Composer . So I need some sort of codec or video converter to use the files. Can anyone help?”
Do you also have such hassles when playing or editing the MXF files? If so, hopefully the instructions below can help you out of troubles.
A common solution to get Avid Media Composer to ingest Sony PMW-300 MXF files natively is to transcode the 50Mbps MXF to DNxHD format, which is best supported by Media Composer. 
To do that, you can use Brorsoft MXF Converter for Mac, which supports optimized presets for Avid Media Composer.
I really like the software from Brorsoft company, expecially this MXF converter for only $29.95. It assists me to convert many MXF videos recorded by Canon to MOV/MPG/MP4 format, so also, I can play these videos on my iPad and editing with Adobe Premiere Pro with no problem now.
Just have a try, and you will love it. If you are running a Windows PC, please turn to MXF Converter.
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Below is the simple guide about how to convert Sony PMW-300 50Mbps 1080p MPEG HD422 XDCAM MXF footage into Avid, Premiere, iMovie, FCP
STEP 1: You need to download, install and run the smart Sony XDCAM MXF Converter Mac and transfer your MXF recordings to the program from the Sony PMW-300 camcorder. Join MXF clips via checking the “Merge into one” box. 
STEP 2: Click on the “Format”bar and choose a best editable format.
a. Select Final Cut Pro > Apple ProRes 422 (*.mov) as the output format for Final Cut Pro. 
b. To edit Sony PMW-300 MXF footage in Avid MC, choose Avid Media Composer->Avid DNxHD(*.mov). 
c. For iMovie, choose iMovie and Final Cut Express > Apple Intermediate Codec(AIC) (*.mov).
d. For importing Sony PMW-300 50Mbps MXF to Premiere Pro, please select Adobe Premiere/Sony Vegas > MPEG-2 (*.mpg).
PS: You also can click “Settings” to set video frame rate, video size and Video Bitrate as you want.
STEP 3: As soon as all things are finished, please click “Convert” button to start the Sony PMW-300 50Mbps MXF conversion on Mac OS X.
Once the conversion is 100% completed, you can smoothly copy the converted files to FCP/Avid/Premiere/iMovie.
Additional Tips:
1. The best MXF to Avid MC Converter is also the best tool for you to convert/import MXF to Sony Vegas, Adobe Premiere, Windows Movie Maker, Magix Movie Edit Pro, and more other video editing programs. You can learn more about it from Brorsoft MXF Converter.
2. If you also intend to convert your Sony PMW-1000/PMW-500/PMW-400/PMW-300/PMW-200 MXF file to MP4, AVI, MOV, VOB, MPEG, etc for some media devices like Pad2, Xoom, Apple TV, Galaxy Tab, etc. You can refer to convert MXF files to AVI, WMV, MOV, VOB, MPEG, MP4 to get some tips.
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