Method start

plugins/_browser/helpers/runtime.py:326–350

(
        self,
        *,
        quality: int,
        every_nth_frame: int,
        viewport: dict[str, int],
    )

        self._expected_height = 0

    async def start(
        self,
        *,
        quality: int,
        every_nth_frame: int,
        viewport: dict[str, int],
    ) -> None:
        self.session.on("Page.screencastFrame", self._on_frame)
        width = max(320, min(4096, int(viewport.get("width") or DEFAULT_VIEWPORT["width"])))
        height = max(200, min(4096, int(viewport.get("height") or DEFAULT_VIEWPORT["height"])))
        self._expected_width = width
        self._expected_height = height
        with contextlib.suppress(Exception):
            await self.session.send("Page.enable")
        await self._apply_cdp_viewport_with_remount({"width": width, "height": height})
        await self.session.send(
            "Page.startScreencast",
            {
                "format": "jpeg",
                "quality": max(20, min(95, int(quality))),
                "maxWidth": SCREENCAST_MAX_WIDTH,
                "maxHeight": SCREENCAST_MAX_HEIGHT,
                "everyNthFrame": max(1, int(every_nth_frame)),
            },
        )

    async def _apply_cdp_viewport_with_remount(self, viewport: dict[str, int]) -> None:
        await self._apply_cdp_viewport(viewport)