There is more room on your memory card, but as far as I know, there is a limit of 20 minutes of video on each video file At the end of each "take" start a new file and you should be good There should be some information on the video feature in your user manual Memory card errors are usually the fault of the memory card. Try formatting it after you have copied all your image files, still and video and see if that corrects the card problem Nowhere have you mentioned formatting the card. If you are in the habit of deleting files to make more room, stop doing that.
Instead, at the end of each shooting day, copy all the image files to your computer and the when safely there, format the card using the format feature on your camera You also did not tell us what class card you are using. If you are shooting video in standard HD, you need a Class 6 card. If you are shooting video in Full HD, you need to use a Class 10 card.
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