You need to make sure the audio and video are not linked, so when you stretch the video the audio remains the same. You can sue the Velocity Envelope to speed up the video, right click on the clip in question go to Envelopes and select Velocity, then a line should appear on the clip, you can push the line to speed and and down to slow down, if you right click the key frame on the left of the clip you can set it more accurately ( and some options)
You can also hold the right side of the clp and while holding the SHIFT key you can streetch the clip, but if the audio is linked the audio will aslo speed up... |