I am trying to put an HD 720p mp4 on my Galaxy S3, but for some reason windows tells me to convert it or it wont play right. I thought the s3 could play HD mp4 videos, but instead I have to convert it and the quality is lost. If I don't convert it, the phone will simply tell me it can't play it. I can download an app to play it, but I'd like to know if it's possible to keep the HD quality and play through the default video player?