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This optimization allows a ChunkSampleStream to output track formats as soon as they're parsed during an InitializationChunk load, rather than waiting until after the InitializationChunk load is completed. In DASH VOD, a single InitializationChunk typically loads the moov and sidx atoms in that order. Hence for long form content where the sidx is a non-trivial size, this may result in the track formats being output a non-negligible period of time sooner than was previously the case. This allows downstream renderers to start codec initialization sooner, potentially decreasing startup latency. For a single test stream on a fast & stable network, this pretty consistently reduced elapsed time until both audio and video codecs have been initialized from ~0.5s to ~0.3 seconds on a Galaxy S8. For 5 test runs without and with these patches, the eventTime logged by EventLogger for the second decoder init were: Without (secs): 0.47 0.47 0.45 0.48 0.46 With (secs) : 0.32 0.33 0.34 0.31 0.40 PiperOrigin-RevId: 289845089