Priority 1 (highest)
-Fix resolution of relative filenames in VOB lists.
Provide a means to specify video aspect and menu & audio language.
Suppress Mozilla error dialogs when processing (file not found etc).
Use ffmpeg to convert unsuitable video files (how do we check this?).
Add keyboard command for "top menu" in preview mode.
Add support for videos in preview mode.
-Support more than 99 videos by grouping them into titlesets.
+Support more than 99 videos somehow (grouping them into titlesets won't help)
Allow explicit ordering of videos.
Priority 3 (lowest)