media offline checking

I`ve tried to render a feature film (98`) to DNXHD 444 via QT and MXF OP1A containers and, despite Resolve`s delivering engine works flawless, the rendered file has always displayed at least one (random) frame as "media offline".
Not knowing why this has happened, I wonder if there is a tool to search for any media offline frames along the rendered file.

I don't know of any way to check this other than watching the entire program.

Yes, Jim, that`s the time consuming problem - 98`.
Thanks