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Sources (for example media projection) can populate the `Surface` from `SurfaceAssetLoader` with timestamps that don't start from zero. But `MuxerWrapper` assumes the latest sample timestamp can be used as the duration when it calculates average bitrate and notifies its listener. This can cause a crash because the calculated average bitrate can be zero if the denominator duration is large enough. Use the max minus first sample timestamp across tracks instead to get the duration. Side note: the large timestamps from the surface texture when using media projection arrive unchanged (apart from conversion from ns to us) in effect implementations and in the muxer wrapper (and are passed to the underlying muxer). The outputs of media3 muxer and the framework muxer are similar. PiperOrigin-RevId: 652422674