It could be achieved by choosing high video bitrate in Settings.

它能实现视频比特率的情况下，选择高在设置。

youdao

The service also supports custom presets (pre-defined settings made by the customer), making it easy for customers to create re-useable transcoding settings for their unique requirements such as a specific video size or bitrate.

ENGADGET: Amazon wants to make your hi-res videos mobile-friendly with Elastic Transcoder