QtAV 1.11.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application belongs to Audio & Video Tools. The actual developer of this free Mac application is WangBin. We recommend checking the downloaded files with any free antivirus.
From the developer:
QtAV is a cross-platform and high-performance multimedia playback framework based on Qt and FFmpeg. The application allows you to play various video files and view online TV channels. You can take screenshots, change the aspect ratio, receive video streams and more.
You may want to check out more software for Mac, such as HALion Player, which might be related to QtAV.