In the latest update apple has removed usage of _HLS_push which was used to reduce the RTT.
I have few questions
1. why _HLS_push was removed ?
2. as every small part will keep on updated in the playlist , their are as many playlist updates as that of small parts in the playlist.
that means as a client we need to check for manifest update every part duration , and make a request for the new part included in the playlist .
so inorder to download a small part we need to request server two times one for updated manifest and other for part segment , will this not cause additional latency ?
3.if PART-HOLD-BACK is required to be atleast part - target duration that means we will not play or request the last part url mentioned with
EXT-X-PRELOAD-HINT,ex:
PART-HOLD-BACK = 1s
/*only last portion of file */
fileSequence272.mp4
#EXT-X-PART:DURATION=0.5,URI="filePart273.0.mp4",INDEPENDENT=YES
#EXT-X-PART:DURATION=0.5,URI="filePart273.1.mp4"
#EXT-X-PART:DURATION=0.5,URI="filePart273.2.mp4"
#EXT-X-PRELOAD-HINT:TYPE=PART,URI="filePart273.3.mp4"here since PART-HOLD-BACK is 1s so we start playback with filePart273.0.mp4(even normal playback should be started from I frame) so any way with in the time of downloading those parts with the manifest updates we will have the complete part of filePart273.3.mp4 in the manifest , so what is the need of indicating EXT-X-PRELOAD-HINT?