I would like to analyze video files to detect scene changes in order to assist the synchronization of audio and video tracks. Ideally, video and audio waveform are displayed for easy alignment of the tracks.
Note: The videos are the result of digitizing old VHS cassettes - thus, the delay varies a lot over time. Therefore, I would like to avoid simply shifting or strechting the entire audio track, since that is not actually sufficient. However, if you know a tool that supports shifting and strechting the audio tracks other than by entering stretching and shifting parameters (like VirtualDub) I would be pleased to hear about it.
Scene detection is not a must, although I assume it can greatly benefit the process.
Is there any free software for this?
What are the cheapest/best commercial tools for this?