A supported browser recording format can still fail during capture
MediaRecorder.isTypeSupported checks a format capability. It does not guarantee enough resources for a particular recording or successful export.
The journal
The viewing journal — page 55
Practical reading about streaming, devices and the decisions behind a better prepared setup.
Muting a browser media track and stopping it need different controls
Disabling a MediaStreamTrack produces empty media frames; stopping it ends that track. A restart control cannot treat the two actions as interchangeable.
The requested capture size may differ from the active track settings
MediaStreamTrack.getSettings reports the selected configuration. Keep it separate from the constraints an application requested.
A browser audio decoder can reject an incomplete file fragment
decodeAudioData expects complete file data. A fetched byte fragment is not automatically an independently decodable audio file.
Why a Web Audio Replay button can work only once
An AudioBufferSourceNode can be started only once. Replaying buffered audio requires a new source node rather than starting the same node again.
A larger audio analyser window changes the measurement view
AnalyserNode fftSize sets the sample window used for frequency analysis. It is not an export bitrate or a sound quality setting.