feat: Improve performance of multi-period DASH parsing #5350
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For manifests with many streams, we saw the bullk of the manifest parse time going towards period combiner. Specifically: splitting codecs and comparing DRMs. This change cuts our manifest parse time for large manifests by nearly 30%. There are two changes: 1. Memoize the normalized codecs inside the period combiner. 2. Short circuit the DRM compatibility check if the DRMInfos arrays are the same object. We run a custom manifest parser and are therefore able to re-use the same drm infos array for functionally equivalent drms, but short circuiting also helps since in the case that the upstream period combiner is comparing a candidate stream with itself.
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Incremental code coverage: 72.73% |
avelad
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type: enhancement
avelad
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Jun 26, 2023
joeyparrish
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joeyparrish
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Jun 26, 2023
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For manifests with many streams, we saw the bulk of the manifest parse time going towards period combiner. Specifically: splitting codecs and comparing DRMs. This change cuts our manifest parse time for large manifests by nearly 30%.
There are two changes: