>It keeps saving them as 4:3.
Often discussed here, actually... 4:3 and 16:9 refer to Display Aspect Ratio.
960x720 indicates the total pixel count. That's one of the ways certain video formats save on space and storage. It's actually 4:3, if the pixels are displayed as square pixels. So yes, you need to resize it to 1280x720 (or any other dimensions in this ratio), in a photo editing app like Photoshop, as Shane mentioned.
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