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.