startWithStreamId method

    async startWithStreamId(streamId, optionsOverride) {
      if (state !== "inactive") {
        log.warn("Recording already active");
        return;
      }

      const opts: ScreenRecordOptions = {
        ...DEFAULT_SCREEN_RECORD_OPTIONS,
        ...optionsOverride,
      };

      const constraints: MediaStreamConstraints = {
        audio: opts.includeAudio
          ? ({
              mandatory: {
                chromeMediaSource: "tab",
                chromeMediaSourceId: streamId,
              },
            } as MediaTrackConstraints)
          : false,
        video: {
          mandatory: {
            chromeMediaSource: "tab",
            chromeMediaSourceId: streamId,
          },
        } as MediaTrackConstraints,
      };

      try {
        stream = await navigator.mediaDevices.getUserMedia(constraints);
        chunks = [];

        const mimeType = mimeForCodec(opts.codec);
        recorder = new MediaRecorder(stream, {
          mimeType,
          videoBitsPerSecond: opts.videoBitrate,
        });

        recorder.ondataavailable = (e: BlobEvent) => {
          if (e.data.size > 0) chunks.push(e.data);
        };

        recorder.onerror = (e) => {
          log.error("MediaRecorder error:", e);
          state = "inactive";
        };

        recorder.start(1000);
        state = "recording";
        log.info(`Recording started via streamId, codec=${opts.codec}`);
      } catch (err) {
        log.error("Failed to start recording from streamId:", err);
        state = "inactive";
        throw err;
      }
    },