Videomaker – Learn video production and editing, camera reviews › Forums › Cameras and Camcorders › Consumer Camcorders › gzhd620 › The most likely reason is
The most likely reason is the CODEC you are using is the wrong one. Try using a diferrent player. Try
VLC Player available from here: http://www.videolan.org/vlc/
You can also use the Evario Media Player that cam on the software disk with your camera.