Rendition report is not used when switching resolution on avplayer (safari 16.3)

Media Technologies Streaming
cvpr0502 OP
Created
Replies 0
Boosts 0
Views 967
Participants 1

I'm developing a LL-HLS feature.

When playing the LL-HLS that I developed in Safari, the EXT-X-RENDITION-REPORT tag does not seem to work when the resoution is changed by ABR.

When changing the resolution, the following request is made.

  1. Request without _HLS_msn and _HLS_part query strings when calling chunklist.m3u8 of different resolutions.
  2. Request including _HLS_msn and _HLS_part query strings after requesting chunklist.m3u8 of 1).

In a hls.js, when changing to a different resolution, it was confiremed that _HLS_msn and _HLS_part query strings were included immediately.

Environment

  • OS: macOS (Ventura 13.2.1)
  • Browser: Safari 16.3

Chunklist.m3u8

  • EXT-X-SKIP tag is not used
  • URL: http://10.60.83.51/cvpr0502/onair_llhls_test0001/chunklist_vfrag2500.stream.m3u8
    • This URL does not play as s sample.
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,PART-HOLD-BACK=3.000000
#EXT-X-PART-INF:PART-TARGET=1.000000
#EXT-X-TARGETDURATION:3
#EXT-X-MEDIA-SEQUENCE:4
#EXT-X-DISCONTINUITY-SEQUENCE:0
#EXT-X-DATERANGE:ID="nmss-daterange",START-DATE="2023-02-20T08:20:00.474Z"

#EXT-X-MAP:URI="vfrag2500.stream_0_0_0.m4s?type=hls&filetype=.m4s"
#EXT-X-PROGRAM-DATE-TIME:2023-02-20T08:20:13.474Z
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_1994603194_1676881213474_13_0_4_0.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_1994603194_1676881213474_13_0_4_1.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_1994603194_1676881213474_13_0_4_2.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXTINF:3.000000,
vfrag2500.stream_1994603194_1676881213474_13_0_4.m4v?type=hls&bitrate=287035&filetype=.m4v
#EXT-X-PROGRAM-DATE-TIME:2023-02-20T08:20:16.474Z
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_3207465476_1676881216474_16_0_5_0.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_3207465476_1676881216474_16_0_5_1.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_3207465476_1676881216474_16_0_5_2.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXTINF:3.000000,
vfrag2500.stream_3207465476_1676881216474_16_0_5.m4v?type=hls&bitrate=345122&filetype=.m4v
#EXT-X-PROGRAM-DATE-TIME:2023-02-20T08:20:19.474Z
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_3408866808_1676881219474_19_0_6_0.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_3408866808_1676881219474_19_0_6_1.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_3408866808_1676881219474_19_0_6_2.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXTINF:3.000000,
vfrag2500.stream_3408866808_1676881219474_19_0_6.m4v?type=hls&bitrate=277635&filetype=.m4v
#EXT-X-PROGRAM-DATE-TIME:2023-02-20T08:20:22.474Z
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_562750089_1676881222474_22_0_7_0.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PART:DURATION=1.000000,URI="vfrag2500.stream_562750089_1676881222474_22_0_7_1.m4v?type=hls&mode=cmaf&filetype=.m4v",INDEPENDENT=YES
#EXT-X-PRELOAD-HINT:TYPE=PART,URI="vfrag2500.stream_562750089_1676881222474_22_0_7_2.m4v?type=hls&mode=cmaf&filetype=.m4v"
#EXT-X-RENDITION-REPORT:URI="chunklist_vfrag1500.stream.m3u8",LAST-MSN=7,LAST-PART=1
#EXT-X-RENDITION-REPORT:URI="chunklist_vfrag400.stream.m3u8",LAST-MSN=7,LAST-PART=1
#EXT-X-RENDITION-REPORT:URI="chunklist_vfrag100.stream.m3u8",LAST-MSN=7,LAST-PART=1

Network in safari

  • First chunklist.m3u8 request with different resoltuion

    • _HLS_msn and _HLS_part query strings not found in URL

  • Second chunklist.m3u8 request

    • _HLS_msn=7&_HLS_part=1 query strings included in URL

I tried putting paths in various patterns such as absolute paths and relative paths in the URL property of the EXT-X-RENDITION-REPORT tag, but is didn't work.

Is this the behavior of the EXT-X-RENDITION-REPORT tag? If not, I would be grateful if you could let me know what part needs to be corrected.

Replies  0
Boosts 0
Views  967
Participants  1