rlaphoenix 111dac9264 Fix association of preceding HLS EXT-X-KEYs with m3u8 fork ...

This will improve efficiency and accuracy of getting appropriate DRM systems when downloading segments.

This can dramatically improve download speed from less than 50 kb/s to full speed if the HLS playlist used a lot of AES-128 EXT-X-KEYs. E.g., a unique key for each segment.

This was caused because the HLS.get_drm function took EVERY EXT-X-KEY, checked for supported systems, loaded them, and returned the supported objects. This meant it could load possibly 100s of AES-128 ClearKey objects (likely requiring URL downloads for the key URI) causing a huge delay before downloading each segment.

2023-03-09 21:46:48 +00:00

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