You can use Blender, it is packaged on the must known linux distributions.
The Video Editor includes:
- Live preview, luma waveform, chroma vectorscope and histogram displays.
- Audio mixing, syncing, scrubbing and waveform visualization.
- Up to 32 slots for adding video, images, audio, scenes, masks and effects.
- Speed control, adjustment layers, transitions, keyframes, filters and more!
see: https://blender.stackexchange.com/