Fix android app

i have a app that play videos but when i play videos in tablets ( when screen is big) video quality is bad so can you fix that or can you connect with another player so when someone click video it will play with another player example with existing player in market (but not to show url of video in player) when i try to open same files in any other player the quality is ok . files are .flv or rtmp:// or .m3u8 Price 30$