Help ! For home video clips to view on TV

Hi,

Is there anyone knows a way to convert higher resolution home video clips (Taken from a digital camera. Resolution 640/fine) to the ones that are fit for viewing on TV?

Reason I am asking is my parent can no longer watch my videos normally ever since I started to use this camera. The sound is distorted and image moves slowed down significantly. But I really like the images provided by using the higher resolution - good for lifetime memory, you know.

Any suggestions or information will be highly appreciated! Thank you.