HLS VOD m3u8 manifest support

[Chris Ballinger]

Currently hlsenc.c supports generating a "live" manifest that is updated with a moving window of segments. There are two other types of manifests, VOD and event.

VOD manifests contain every segment and are useful to generate simultaneously with the live manifest, so when an event is over, a full version of the event is immediately available.

This could be achieved by simply adding "#EXT-X-PLAYLIST-TYPE:VOD" as the second line at the top of another manifest that contains all segments.

#EXTM3U
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-TARGETDURATION:10
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:10.0,
fileSequenceA.ts
#EXTINF:10.0,
fileSequenceB.ts
#EXTINF:10.0,
fileSequenceC.ts
#EXTINF:9.0,
fileSequenceD.ts
#EXT-X-ENDLIST

The "event" type (#EXT-X-PLAYLIST-TYPE:EVENT) is similar to the live type, however instead of a sliding window, the manifest grows only by appending new segments. This allows a user to join a live event but seek to the beginning of a stream. When an event is finished, an event manifest is more or less equivalent to a VOD manifest.

Full documentation is here:

​https://developer.apple.com/library/ios/technotes/tn2288/_index.html#//apple_ref/doc/uid/DTS40012238-CH1-TNTAG2

[Steven Liu]

-f hls hls_playlist_type can fix this

  -hls_playlist_type <int>        E....... set the HLS playlist type (from 0 to 2) (default 0)
     event                        E....... EVENT playlist
     vod                          E....... VOD playlist

[Carl Eugen Hoyos]

Fixed in 77e355ffb1d669e90ad3784dea8f0950b66f7564