Thank you for your support to TinyDeal.
When using the convert tool, you should choose the corresponding file type of the video file, for example if you choose WMV file, the file type should be window media file(*wmv wma, asf) which is corresponding to WMV file. Otherwise, there will have some fault like no sound when playing the converted file by our Mp3 player), and you should choose the RIGHT screen size in the setup model.
Any other questions please feel free to contact us on https://help.tinydeal.com/contact-us. And we would answer you within 24 hours.
Have a nice day!