The bounce rate is off even if my channel launches into playback.
My channel opens to playback on a small screen, but the bounce rate is still different.
The bounce rate is not affected by whether video is full screen or windowed. We track the fact that a launch event occurred, a play event did or didn't occur, and seconds streamed. Likely the stream launched at start failed to play, or the channel crashed on launch or exited before video played.