IPhone video transfer to youtube?

I transfer my iPhone 5s high quality video to PC and when I open it on my laptop the quality looks bad and super tan, why is that?

Low resolution.

IPhone compresses the movie before uploading it.

Here are some of the best Video uploading specification which You tube prefers
- Best video format for YouTube: H.264, MPEG-2 or MPEG-4
- Aspect Ratio: Native aspect ratio without letterboxing (examples: 4:3, 16:9)
- Resolution: 640x360 (16:9) or 480x360 (4:3) recommended
- Audio format: MP3 or AAC preferred
- Frames per second: 30
- Maximum length: 10 minutes (we recommend 2-3 minutes)
- Maximum file size: 1 GB