Replaces two functions calls, that were deprecated and aliases for the
new function name:
- Migrator.python -> Migration.run
- Migrator.change_column -> Migrator.change_field
* Generate low res low fps previews for recordings viewer
* Make sure previews end on the hour
* Fix durations and decrase keyframe interval to ensure smooth scrubbing
* Ensure minimized resolution is compatible with yuv
* Add ability to configure preview quality
* Fix
* Clean up previews more efficiently
* Use iterator