Wrong FPS for QuictTime (mov) files

[tomaszkane]

Hi,
I download Tears of Steel in 720p .mov from https://mango.blender.org/download/ and $fileInfo['video']['frame_rate'] says it has 1000 fps.

I believe it's wrong.

[ar-turek]

I think I can help pinpoint the issue a bit better.

In line 167 the frame rate for the video is being set if it has not been set before. But for the Tears of Steel .mov file the frame rate is already set to 1000 after a call to QuicktimeParseAtom in line 140 while parsing the 'moov' atom.

Also tested it on other files and there is no such issue.

[JamesHeinrich]

QuickTime is sometimes annoying to work with due to the possibility of variable framerates, and framerate values (like most other things QuickTime) are store in multiple places.

I have made a change that should fix this particular problem, perhaps other similar problems, but there's also a small chance it may have broken some previously-working files. Please let me know if that is the case.
bdf0739