EncodingError Fix, New Audio Warning Option, and Improved Video Quality from Safari

The recording client now correctly handles a new EncodingError message (“The given encoder configuration is not supported by the encoder.”), restoring the fallback behavior on older Android devices. Previously, the monitored message was “Video encoding failed”.

Added a new embed code option called disableaudiowarningmsg to hide the warning message displayed at the bottom of the recording client when no audio is detected.

Video quality on Safari: Switched to a variable video bitrate for MP4 video recordings (Safari on iOS and macOS) for better video quality. The requested bitrate now ranges from 0.3Mbps for 320x240 to 14Mbps for 4k recordings (instead of defaulting to 2.5Mbps).

^le: A separate 5Mbps limit remained in place until we removed it in this build.

Microphone Input Warning: Switched to checks every 1 second (instead of 2) when we detect a microphone with no input. We mark an input device as having sound right away (without waiting for 15 seconds as in the initial implementation).

Build slug: fd21de285