OptionalEveryEmit only every Nth frame to reduce throughput (e.g. 2 emits half the frames). Defaults to every frame when omitted.
OptionalFormatImage encoding for emitted frames. Defaults to 'jpeg' (smaller frames).
OptionalMaxMaximum frame height in pixels (frames are scaled down to fit).
OptionalMaxMaximum frame width in pixels (frames are scaled down to fit).
OptionalQualityCompression quality 0–100 (applies to the 'jpeg' format only).
Options controlling a screencast session started via BaseBrowserAdapter.StartScreencast. All fields are optional — adapters apply sensible defaults (and ignore options they cannot honor).