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MaskingMediaSource needs to resolve the prepare position set for a MaskingPeriod while the source was still unprepared to the first actual prepare position. It currently assumes that the period-window offset and the default position is zero. This assumption is correct when a PlaceholderTimeline is used, but it may not be true if the real timeline is already known (e.g. when re-preparing a live stream after a playback error). Fix this by using the known timeline at the time of the preparation. Also: - Update a test that should have caught this to use lazy re-preparation. - Change the demo app code to use the recommended way to restart playback after a BehindLiveWindowException. Issue: #8675 PiperOrigin-RevId: 361604191