Lumia Video Trimmer is able to trim all clips captured with your Lumia device. Commonly these are H.264 with an .mp4 container. You can't trim a video which you have downloaded from web. Most likely it probably is not in the right format.
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- Which Microsoft and Nokia branded accessories have special support in Device Hub?
- How can I update my Lumia software (Windows Phone 8)?
- How do I change PIN code on my Lumia phone?
- What type of data can I transfer from my old phone to my new Lumia Windows Phone 8?