For FlixMe videos, you should use the highest resolutions possible. 

• File format. MP4 (Recommended), MOV, M4V and MPEG
• Codec. The MP4 video files should be a H.264 file container and an AAC-LC audio codec with recommended audio bitrate of 128kbs or higher.
• Aspect ratio. FlixMe's standard aspect ratio is 16:9. Our players and platform is designed for wide-screen formats. 
• Frame rate. We recommend using either 24, 25 or 30 fps (frames per second) when filming or in post-production.
• Video resolution.  As a general guide, videos should be a minimum 720p resolution. The higher the video resolution, the larger the files, and the longer it will take to upload them. For the average creators, the recommended size is 1080p resolution, which is considered HD video. You can also encode for 2k or 4k resolution however but it might not be worth the effort. A large portion of people watch videos on their phones, and on such small screens, the difference between 1080p and 4K is undectable.

For FlixMe audio, you should use the best quality / bitrate possible.

• File format mp3, m4a, wav, aac
• Bitrate minimum 64 kbps recommended 128 kbps or higher.