my player wont play video thats on my sd card. its a 1 gig. i unplugged the player, put the card in the adapter and in my computer. then converted the video and saved it to the card. but the video wont play. i can get the music to work. the music on the card has a little pic of a card next to the song. and it plays. does anyone know how to play video off of a card with my sansa e280?