Updates to Mac OS software has created compatibility issues within Avid that prevent the encoding of certain file formats. The steps below are only intended for those who are unable to export an Quicktime or H.264 file directly from Avid.
Alternate Export Setting
Use the typical Output/Export to File
Choose the 'untitled' preset in the 'export as...' window (we're changing this anyway). Then hit options.
In the 'Export Settings' window, next to 'export as" choose "MXF OP1a"
Under Video Compression select DNxHD 115
Under Audio select 4800kHz, 16, stereo (unless you've mixed for 5.1 surround)
Name your file and give it a location. (Notice the new .mxf extension)
This will give you an uncompressed MXF file which can be played by most programs - except Quicktime.
VLC Player is a great free video playing application that can handle more formats than Quicktime. This program should be able to play your MXF file smoothly. Here's the link if you need to download it: https://www.videolan.org/vlc/index.html
Transcoding MXF to Quicktime or H.264
If you are unable to download VLC, need a compressed file, or you are required to submit a Quicktime format file, you can transcode one using Adobe Media Encoder. This program is automatically installed if you have Premiere Pro on your computer.
Open Adobe Media Encoder from Applications
Add your file to the queue by dragging it into the window on the right.
Select a preset by clicking the dropdown arrow. H.264 is a great preset if you’re playing in quicktime or uploading to the web.
Or you can customize your settings further by clicking directly on the blue text to reveal the familiar Premiere export settings window
Be sure to rename your file so you don’t overwrite the original. Click on the blue text under "Output File"
Using the codec to organize your exports is a nice organizational tip. Choose the location for your export.
Click the green play button to start encoding your new file.