I am using a Canon Legria S21 and store clips on Sandisk Ultra II SDHC 32gb. However, after I transfered the clips from the SDHC to an external harddisk and try playing the clips (.mts files) on Western Digital HD Media Player to TV, the images are stuttering. What do you think is the cause?

I have problem playing smooth file on my PC too.

Is my SDHC too slow?