调整视频质量360,720等

By Using video URL's I'm playing video's in my app, now in addition I need to implement Adjust Video Quality feature because as per App requirement if there is slow internet so there would be a Quality selection options like Youtube.(144,260,320,720 etc ).I did some R&d and found there are some compression tools But didn't found that.So can anybody tell me how can I achieve this feature.

Any help will be appreciable.

Please check for more understanding

Video's are at PHP server