Video Player: Pitch Shift
Hello! I'm developing a video player for playing karaoke videos. One useful feature would be to change the key of a song while playing back. So how could I modify the audio stream of a video while playing back in a QT application? There seemed to be hardly any information about this.
It has been a while. Is this even possible with qt? Anyway, it would be extremely helpful if anyone could answer to even one of the following questions:
- How could I separate audio from a video file?
- How could I change the audio track of the currently playing video?
- Are there any other libraries that could help?