What program are you using to view the movies? According to the Canon site the SX50HS records "Video: MOV (Image: H.264; Audio: Linear PCM (Stereo))".
Source: http://www.usa.canon.com/cusa/consumer/products/cameras...
You should be able to view the video with QuickTime, VLC and other programs.
Is there more to the error message? If yes, please give more details.