I can't find much information online either but it's SMPTE 391M: OP-1b. It's basically mxf files that are not inside a package. All the elements are separate and it is accompanied by an xml document that tells the player how to play it back. It could be an old format that some companies are still using. Here's something I found that mentions it. https://www.drastic.tv/support-59/suppo ... -mxf-files
I can't find much information online either but it's SMPTE 391M: OP-1b. It's basically mxf files that are not inside a package. All the elements are separate and it is accompanied by an xml document that tells the player how to play it back. It could be an old format that some companies are still using. Here's something I found that mentions it. https://www.drastic.tv/support-59/suppo ... -mxf-files