Alert users when they are opening a broken file.
|Reported by:||verm||Owned by:|
#1120 highlighted an issue: it's possible to open a broken file and have it silently break.
We should have a general way to alert users when they are open a broken file and give them no way to move forward until they pass a dialogue. jfs suggested blocking the video screen with a message.
This is the second case of an issue where we allow broken files to be opened the first was h264 in .avi which also needs an error.