Beat analysis

Submitted by Mathieu Duponchelle @Mathieu_Du

Description

A lot of people doing video edition go through the tedious task of cutting on the beat manually. There exists multiple implementations of beat detection, providing the exact position of each beat, and we could automate the task of cutting / serializing clips using them.

This is an original feature, available nowhere else to the extent of our knowledge, and it would help in giving Pitivi an edge !

Subtasks:

• Detect the beats in a clip's audio, possibly using some 3rd party library.
• Display them: on the clip, or in a new separate markers bar.
• Add keyboard shortcuts to seek to the previous/next beat.
• Add keyboard shortcut to move the selected clip at the playhead.