sir recently i bought a sony dvp-sr750hp usb dvd player. it can play avi,mpg,mpeg,mp4,xvid video files. i have many video fils in my computer like mkv,dvd etc. dut it can not play these files. when i convert these files to avi or mpeg-1 or 4 through free softwer like iwisoft,free video converter,altysoft free video converter etc. but after converting when i play these files on on my dvd player via usb the player shows on lcd data errer.. i tried many free softwer but there is no solution for my problem. sir please solve my problem. which is best free and paid softwere.