The file you upload will not be modified in any way by the server. Because of that PLEASE pay attention to the following guidelines. They will help you to seamlessly upload the video.
1. File format: mp4.
2. 720p resolution (aspect ratio: 16:9).
3. Video compression standard H.264 – the video should be stored at 25 progressive frames (720@25p) using mp4 container (the file should be exported with the mp4 extension).
4. Audio compression standard AAC.
5. The uploaded file cannot be larger than 400 MB and its bitrate cannot be larger than 4 000 kb / s.