In Australia, one of the formats commonly used for television broadcast files is OP1a compliant MXF. Channel 7 has very specific requirements for how the file should be formatted for their primary and all their secondary channels. MXF is essentially a container, and inside it is the video content, the audio content, and it can also include the subtitle content. If you’ve never worked with broadcast media before it is a bit of an obscure format that you will probably not have heard of. Fortunately Adobe Premiere makes it extremely easy to export into this format. Below you will find the settings I use that are accepted by Channel 7. I cannot promise that your media will be accepted using the same settings, but I can’t see any reason it wouldn’t be.
1. Select your base format and presets
So to start with, open up the export dialog as you normally would be going to the File menu and navigating to Export > Media.
On the top right of the export dialog window you can see your “Export Settings”. Right at the top of this section, select MXF OP1a from the format drop down box.
Directly below format, you can select a preset if you wish. There is a very long list of them available in the “Preset” drop down box. We will go through and configure the actual settings next, but I chose “XDCAM HD 50 Pal 50i” right at the bottom as my base preset because it is the closest to the specified requirements of Channel 7.
2. Customise the video settings
There are a number of options available in the video settings of the Adobe Premiere export dialogue and you can check out the screenshot below to see exactly how my video settings look.
Video Codec: For this one you want to choose XDCAMHD 50 PAL (4:2:2).
Frame Rate: 25
Field order: Upper First
Aspect: Square Pixels (1.0)
Enable Smart Rendering Codec: Selected
Edit Units Per Partition: Default
3. Customise the audio settings
The audio settings are pretty simple, but pay particular attention to your channels and sample size, while they are the only settings they can get your file rejected if not set correctly. Check out the screenshot to see my settings.
Audio Codec: Uncompressed
Sample Rate: 48000 Hz
Channels: 8 channel
Sample Size: 24 bit.
That’s it, you’re done. You can now export your video into an OP1a compliant MXF container ready to be sent to Channel 7. I would recommend saving these settings as a custom preset if you need to use it a lot. Doing so helps to ensure that you don’t accidentally miss a setting!