Remove unwanted scenes from a video you recorded on
HTC Sensation.
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On the
Gallery app’s
Albums screen, tap an album.
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Press and hold the video you want to edit, and then tap
Trim.
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Drag the two trim sliders to the part where you want the video to begin and end.

As you drag a slider, you'll see time markers and video frames. The one in the middle is your start or end frame.
-
Tap
to preview your video.
-
Tap
Done.
The trimmed video is saved as a new file. The original video remains unedited.