When you choose to use the web UI for the DVR server, you are using the media capabilities of the browser you are accessing the DVR server from. Channels has no control over this.
If you choose to use one of Channels' clients, the playback is handled with a custom media player based upon mpv
.
If you are choosing to use the web UI instead, you are at the mercy of the browser. Channels has no control over which browser you use, and they have no control over which media containers and codecs your browser supports.
No. I am saying that if you choose to use one of their clients which they support, and you experience an issue, then you have a valid bug report if something isn't working. But if you are choosing to use a browser that they have no control over, then they can't offer any relevant fixes, because they aren't in control of the client you are using.
You're wrong. The "web UI player" is your web browser's media player. The content is supplied by your Channels DVR, but how it is handled is completely out of their hands.