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Dafydd
[Moderator]

Gary,

What you want to do may be simpler to accomplish by using the PiP track. Done right you never touch or disturb the audio track from your A cam video.

Take the scene you want to display from your B roll and drag it to the PiP track just under the position on the main video track. Trim it to the length you want and then click and drag opposite corners until the small PiP image completely covers the image on the A roll.

Now to synch the B roll portion to the A roll, stretch out the timeline enough to be able to see the audio waveform on both tracks. Move the B roll track until the waveforms match and then mute the audio from the B roll.

What you will have is for that scene when the vertical "scrubber" line reaches the point on the timeline where your B roll image is on the PiP track that B roll image will "takeover" but the audio on the A roll never changes. At the end of that B roll segment the main track image picks up and plays until your next B roll segment is placed.

You are using selected segments from the B roll (camera B) as "cutaway" views without disturbing the main video track's audio.

The main trick is in getting the B roll segment lined up correctly so that good lip synch and action synch is maintained.

I do this regularly in handgun training videos where I show the shooter firing and have a small PiP from a second camera showing the hits on target. Using the audio waveform for synch is a simple matter of insuring the spikes from the gunshots appear in the exact same position on both tracks on the timeline, then I can mute the B roll audio.

Hope this helps.