EXT-X-KEY tag only applies to the first segment after it

[AlecJY]

Some HLS media playlists provide only one EXT-X-KEY tag to indicate how to decrypt the segments rather than provide it before every segments. Like below.

https://bitmovin-a.akamaihd.net/content/art-of-motion_drm/m3u8s/11331_video_1080_4800000.m3u8

#EXTM3U

#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-TARGETDURATION:4
#EXT-X-KEY:METHOD=AES-128,URI="../video/1080_4800000/enc_hls/encryption.key",IV=0x613E8B8CE9CE208C4EAD4A0E03636371

#EXTINF:4.0
../video/1080_4800000/enc_hls/segment_0.ts
#EXTINF:4.0
../video/1080_4800000/enc_hls/segment_1.ts
#EXTINF:4.0
../video/1080_4800000/enc_hls/segment_2.ts
#EXTINF:4.0
../video/1080_4800000/enc_hls/segment_3.ts

It seems that all segments are encrypted and can be decrypt by the key. However, If I use MediaPlaylistParser to parse the playlist, only the first segment has SegmentKey object. Other segments have no SegmentKey. Would you set the same SegmentKey object to other segments?

[carlanton]

Hi,

Yes, currently you'll have to find the previous non-empty key. It's the same for all media segment attributes. I guess it would be handy if the parser could do that for you. Pull requests are welcome :)