Safari decode error on overlapping append (regression in startup) #6441

tvinko · 2024-05-24T08:16:55Z

What version of Hls.js are you using?

1.5.0

What browser (including version) are you using?

Safari 17.4.1

What OS (including version) are you using?

IOS

Test stream

https://js-tests.b-cdn.net/freezing.html

Configuration

{
debug: true,
abrEwmaDefaultEstimate: 5000000,
maxBufferLength: 120,
minBufferLength: 20,
autoStartLoad: true,}

Additional player setup steps

No response

Checklist

The issue observed is not already reported by searching on Github under https://github.com/video-dev/hls.js/issues
The issue occurs in the stable client (latest release) on https://hlsjs.video-dev.org/demo and not just on my page
The issue occurs in the latest client (main branch) on https://hlsjs-dev.video-dev.org/demo and not just on my page
The stream has correct Access-Control-Allow-Origin headers (CORS)
There are no network errors such as 404s in the browser console when trying to play the stream

Steps to reproduce

Open video from provided url on iPhone device

Expected behaviour

Playing video

What actually happened?

Video freezes in the first second. It works fine till v1.5 or on native hls support.

I'm aware that there were some changes from v1.5+ with adding support for MMS that can affect this.

Console output

[Log] [log] > – "Debug logs enabled for \"Hls instance\" in hls.js version 1.5.0" (hls.min.js, line 1)
[Log] [log] > – "stopLoad" (hls.min.js, line 1)
[Log] [log] > – "loadSource:https://vz-1cd8a68b-1aa.b-cdn.net/cb6f1dd3-85b5-4cf5-9570-6f35d9b1b244/playlist.m3u8" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Trigger BUFFER_RESET" (hls.min.js, line 1)
[Log] [log] > – "attachMedia" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "created media source: ManagedMediaSource" (hls.min.js, line 1)
[Error] [error] > – "Media element src was set while attaching MediaSource (blob:https://js-tests.b-cdn.net/754706aa-7f88-4274-9c16-d701ed34411d > undefined)"
	(anonymous function) (hls.min.js:1:251929)
[Log] [log] > – "[level-controller]:" – "manifest loaded, 4 level(s) found, first bitrate: 1420335" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "1 bufferCodec event(s) expected" (hls.min.js, line 1)
[Log] [log] > – "set currentLevel:2" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Switching to level 2 (480p SDR avc1,mp4a @2450614) from level -1" (hls.min.js, line 1)
[Log] [log] > – "set currentLevel:-1" (hls.min.js, line 1)
[Log] [log] > – "startLoad(-1)" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Loading level index 2 with https://vz-1cd8a68b-1aa.b-cdn.net/cb6f1dd3-85b5-4cf5-9570-6f35d9b1b244/480p/video.m3u8" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Switching to level 2 (480p SDR avc1,mp4a @2450614) from level 2" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Loading level index 2 with https://vz-1cd8a68b-1aa.b-cdn.net/cb6f1dd3-85b5-4cf5-9570-6f35d9b1b244/480p/video.m3u8" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "STOPPED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[subtitle-stream-controller]:" – "STOPPED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "Media source opened" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->STOPPED" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Switching to level 2 (480p SDR avc1,mp4a @2450614) from level 2" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Loading level index 2 with https://vz-1cd8a68b-1aa.b-cdn.net/cb6f1dd3-85b5-4cf5-9570-6f35d9b1b244/480p/video.m3u8" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "STOPPED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[subtitle-stream-controller]:" – "IDLE->STOPPED" (hls.min.js, line 1)
[Log] [log] > – "[subtitle-stream-controller]:" – "STOPPED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Level 2 loaded [0,115][part-115--1], cc [0, 0] duration:462.833333" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "Updating Media Source duration to 462.833" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 0 cc: 0 of [0-115] level: 2, target: 0" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "injecting Web Worker for \"main\"" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer-interface, main]: Starting new transmux session for sn: 0 p: -1 level: 2 id: 1↵        discontinuity: true↵        trackSwitch…" (hls.min.js, line 1)
"[transmuxer-interface, main]: Starting new transmux session for sn: 0 p: -1 level: 2 id: 1
        discontinuity: true
        trackSwitch: true
        contiguous: false
        accurateTimeOffset: true
        timeOffset: 0
        initSegmentChange: true"
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 0 of level 2" (hls.min.js, line 1)
[Log] [log] > – "Debug logs enabled for \"main\" in hls.js version 1.5.0" (bd430b2b-5f77-4c1b-ada3-f058c4887d91, line 1)
[Log] [log] > – "[mp4-remuxer]: ISGenerated flag reset" (hls.min.js, line 1)
[Log] [log] > – "[mp4-remuxer]: initPTS & initDTS reset" (hls.min.js, line 1)
[Log] [log] > – "[mp4-remuxer]: reset next timestamp" (hls.min.js, line 1)
[Log] [log] > – "manifest codec:mp4a.40.2, ADTS type:2, samplingIndex:3" (hls.min.js, line 1)
[Log] [log] > – "parsed codec:mp4a.40.5, rate:48000, channels:2" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Init audio buffer, container:audio/mp4, codecs[selected/level/parsed]=[mp4a.40.2/mp4a.40.2/mp4a.40.5]" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Init video buffer, container:video/mp4, codecs[level/parsed]=[avc1.4d401f/avc1.4d401f]" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "0 bufferCodec event(s) expected audio,video" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "creating sourceBuffer(audio/mp4;codecs=mp4a.40.2)" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "creating sourceBuffer(video/mp4;codecs=avc1.4d401f)" (hls.min.js, line 1)
[Log] [log] > – "[audio-stream-controller]:" – "InitPTS for cc: 0 found from main: 132000" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 0 of level 2" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 0 of level 2 (frag:[0.000-4.000] > buffer:[0.000-3.947])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Info] [info] > – "[abr] switch candidate:2->3 adjustedbw(36848000)-bitrate=32121481 ttfb:0.0 avgDuration:4.0 maxFetchDuration:3.9 fetchDuration:0.…" (hls.min.js, line 1)
"[abr] switch candidate:2->3 adjustedbw(36848000)-bitrate=32121481 ttfb:0.0 avgDuration:4.0 maxFetchDuration:3.9 fetchDuration:0.6 firstSelection:false codecSet:avc1,mp4a videoRange:SDR hls.loadLevel:2"
[Log] [log] > – "[stream-controller]:" – "Adapting to level 3 from level 2" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Switching to level 3 (720p SDR avc1,mp4a @4726519) from level 2" (hls.min.js, line 1)
[Log] [log] > – "[level-controller]:" – "Loading level index 3 with https://vz-1cd8a68b-1aa.b-cdn.net/cb6f1dd3-85b5-4cf5-9570-6f35d9b1b244/720p/video.m3u8" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->WAITING_LEVEL" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Level 3 loaded [0,115][part-115--1], cc [0, 0] duration:462.83042400000033" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "WAITING_LEVEL->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 0 cc: 0 of [0-115] level: 3, target: 3.947" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer-interface, main]: Starting new transmux session for sn: 0 p: -1 level: 3 id: 1↵        discontinuity: false↵      …" (hls.min.js, line 1)
"[transmuxer-interface, main]: Starting new transmux session for sn: 0 p: -1 level: 3 id: 1
        discontinuity: false
        trackSwitch: true
        contiguous: false
        accurateTimeOffset: true
        timeOffset: 0
        initSegmentChange: false"
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 0 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[mp4-remuxer]: ISGenerated flag reset" (hls.min.js, line 1)
[Log] [log] > – "[mp4-remuxer]: initPTS & initDTS reset" (hls.min.js, line 1)
[Log] [log] > – "[mp4-remuxer]: reset next timestamp" (hls.min.js, line 1)
[Log] [log] > – "manifest codec:mp4a.40.2, ADTS type:2, samplingIndex:3" (hls.min.js, line 1)
[Log] [log] > – "parsed codec:mp4a.40.5, rate:48000, channels:2" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Init audio buffer, container:audio/mp4, codecs[selected/level/parsed]=[mp4a.40.2/mp4a.40.2/mp4a.40.5]" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Init video buffer, container:video/mp4, codecs[level/parsed]=[avc1.4d4020/avc1.4d4020]" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "changing audio sourceBuffer type to audio/mp4;codecs=mp4a.40.5" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "switching codec mp4a.40.2 to mp4a.40.5" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 0 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 0 of level 3 (frag:[0.000-4.004] > buffer:[0.000-3.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 1 cc: 0 of [0-115] level: 3, target: 3.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 1 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 1 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 1 of level 3 (frag:[3.989-8.008] > buffer:[0.000-7.979])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 2 cc: 0 of [0-115] level: 3, target: 7.979" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 2 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 2 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 2 of level 3 (frag:[7.979-12.012] > buffer:[0.000-11.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 3 cc: 0 of [0-115] level: 3, target: 11.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 3 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 3 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 3 of level 3 (frag:[11.989-16.016] > buffer:[0.000-16.000])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 4 cc: 0 of [0-115] level: 3, target: 16" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 4 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 4 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 4 of level 3 (frag:[16.000-20.003] > buffer:[0.000-19.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 5 cc: 0 of [0-115] level: 3, target: 19.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 5 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 5 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 5 of level 3 (frag:[19.989-24.007] > buffer:[0.000-23.979])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 6 cc: 0 of [0-115] level: 3, target: 23.979" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 6 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 6 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 6 of level 3 (frag:[23.979-28.011] > buffer:[0.000-27.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 7 cc: 0 of [0-115] level: 3, target: 27.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 7 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 7 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 7 of level 3 (frag:[27.989-32.015] > buffer:[0.000-32.000])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 8 cc: 0 of [0-115] level: 3, target: 32" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 8 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 8 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 8 of level 3 (frag:[32.000-36.003] > buffer:[0.000-35.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 9 cc: 0 of [0-115] level: 3, target: 35.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 9 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 9 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 9 of level 3 (frag:[35.989-40.007] > buffer:[0.000-39.979])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 10 cc: 0 of [0-115] level: 3, target: 39.979" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 10 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 10 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 10 of level 3 (frag:[39.979-44.011] > buffer:[0.000-43.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 11 cc: 0 of [0-115] level: 3, target: 43.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 11 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 11 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 11 of level 3 (frag:[43.989-48.015] > buffer:[0.000-48.000])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 12 cc: 0 of [0-115] level: 3, target: 48" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 12 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 12 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 12 of level 3 (frag:[48.000-52.002] > buffer:[0.000-51.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 13 cc: 0 of [0-115] level: 3, target: 51.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 13 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 13 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 13 of level 3 (frag:[51.989-56.006] > buffer:[0.000-55.979])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 14 cc: 0 of [0-115] level: 3, target: 55.979" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loaded fragment 14 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->PARSING" (hls.min.js, line 1)
[Log] [log] > – "[transmuxer.ts]: Flushed fragment 14 of level 3" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSING->PARSED" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Buffered main sn: 14 of level 3 (frag:[55.979-60.010] > buffer:[0.000-59.989])" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "PARSED->IDLE" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "Loading fragment 15 cc: 0 of [0-115] level: 3, target: 59.989" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "IDLE->FRAG_LOADING" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "Media source ended" (hls.min.js, line 1)
[Log] [log] > – "[buffer-controller]" – "Media source closed" (hls.min.js, line 1)
[Log] [log] > – "[stream-controller]:" – "FRAG_LOADING->STOPPED" (hls.min.js, line 1)
[Log] [log] > – "[subtitle-stream-controller]:" – "IDLE->STOPPED" (hls.min.js, line 1)

Chrome media internals output

No response

robwalch · 2024-05-24T20:20:30Z

I can reproduce the issue on desktop Safari 17.5 on macos Sonoma. I only see it when switching up on start (from any of levels 0-2 to 3) and then playing past the one second mark. The playback error is logged by the browser:

The video playback was aborted due to a corruption problem or because the video used features your browser did not support - Media failed to decode

There is no issue playing each media playlist individually so this looks like a problem with what I noticed are overlapping appends on start. You can workaround it by setting "startLevel": 3. I can't reproduce decode errors after starting on this variant. I suggest filing a bug against Safari with Feedback Assistant.

It works fine till v1.5 or on native hls support.
I'm aware that there were some changes from v1.5+ with adding support for MMS that can affect this.

The decode error is not there in v1.4.13 with desktop Safari, but I notice there is no overlapping append of the first segment(s) of each loaded variant. Disabling MMS with preferManagedMediaSource: false, does not resolve the issue either, so I think we can say it's not related to MMS. It's more likely related to a change in fragment selection resulting in the overlapping append, which I would not expect to cause a decode error - that looks like a Safari MSE bug IMO.

tvinko · 2024-05-27T10:32:53Z

Hey @robwalch , thanks for those insights.

I'm having similar issues with Airplay that is not casted from iphone to macos -> works prior the v1.5.0 and on native hls ios implementation (testing from hls demo and with no warnings or errors in console)

I'm waiting for customer permissions to publish the video, and I'll create a new issue for inspection.

robwalch · 2024-05-27T15:32:37Z

I'm having similar issues with Airplay

Does this help?

https://webkit.org/blog/15036/how-to-use-media-source-extensions-with-airplay/

If so please file another issue. I'd like to keep this issue scoped to the decoding error in Safari with overlapping appends.

robwalch · 2024-05-27T17:48:16Z

The reason for the overlapping appends on switch is the difference in durations. The first segment in the lowest variant lists a duration of "4.000000" while the first segment of the highest lists "4.004011". maxFragLookUpTolerance used to look over this kind of discrepancy but that is no longer the case.

tvinko · 2024-05-28T11:42:46Z

The reason for the overlapping appends on switch is the difference in durations. The first segment in the lowest variant lists a duration of "4.000000" while the first segment of the highest lists "4.004011". maxFragLookUpTolerance used to look over this kind of discrepancy but that is no longer the case.

Thanks for noticing that, indeed. Although FFProbe shows 4, the playlist reports different. Is there any equivalent to maxFragLookUpTolerance?

robwalch · 2024-05-28T18:25:37Z

Thanks for noticing that, indeed. Although FFProbe shows 4, the playlist reports different. Is there any equivalent to maxFragLookUpTolerance?

Not for this scenario. We would either need to add a new tolerance for picking the next fragment on switch - it should very small by default (1/200s or %1 of fragment duration) and could be configurable. Or, we could look into inserting a flush operation or seek to flush the decoder for overlapping appends. I don't think the latter is appropriate for a patch. New config options usually wouldn't be included in a patch either, but would be OK as a configurable enhancement where the default matches current behavior (default of 0). Any preference on your end?

…ist within 1/200s tolerance Fixes edge-case starting in v1.5 that causes #6441

robwalch · 2024-05-31T21:59:33Z

I'm going to push a patch with #6471 that should address your start up issue and prevent overlapping appends for the first VOD segments which do not overlap (with a small allowance of 1/200s or less masked by maxFragLookupTolerance).

…ist within 1/200s tolerance (#6471) Fixes edge-case starting in v1.5 that causes #6441

tvinko · 2024-06-02T21:19:59Z

Hey @robwalch sorry for the late response.

Many thanks for your fast response and the patch!

robwalch · 2024-06-03T21:29:38Z

Hi @tvinko,

Let me know if v1.5.10 resolves the issue for you. If you are still experiencing the decode error at or even after startup let me know.

tvinko · 2024-06-05T06:20:56Z

Hey @robwalch fixed!

Thanks

tvinko added Bug Needs Triage If there is a suspected stream issue, apply this label to triage if it is something we should fix. labels May 24, 2024

robwalch added browser: Safari Confirmed and removed Needs Triage If there is a suspected stream issue, apply this label to triage if it is something we should fix. labels May 24, 2024

robwalch added the Browser issue If there is an underlying issue with the browser that hls.js is running on, this tag should be used. label May 24, 2024

robwalch changed the title ~~Attaching MediaSource issue~~ Safari decode error on overlapping append May 31, 2024

robwalch added this to the 1.5.10 milestone May 31, 2024

robwalch added a commit that referenced this issue May 31, 2024

Don't append over first fragment when next fragment aligns with playl…

4b45336

…ist within 1/200s tolerance Fixes edge-case starting in v1.5 that causes #6441

robwalch added a commit that referenced this issue May 31, 2024

Don't append over first fragment when next fragment aligns with playl…

618e529

…ist within 1/200s tolerance Fixes edge-case starting in v1.5 that causes #6441

robwalch changed the title ~~Safari decode error on overlapping append~~ Safari decode error on overlapping append (regression in startup) May 31, 2024

robwalch mentioned this issue May 31, 2024

Prevent overlapping appends on start not present in v1.4.x #6471

Merged

3 tasks

robwalch added a commit that referenced this issue Jun 1, 2024

Don't append over first fragment when next fragment aligns with playl…

e1c2904

…ist within 1/200s tolerance (#6471) Fixes edge-case starting in v1.5 that causes #6441

robwalch removed this from the 1.5.10 milestone Jun 3, 2024

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Safari decode error on overlapping append (regression in startup) #6441

Safari decode error on overlapping append (regression in startup) #6441

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Safari decode error on overlapping append (regression in startup) #6441

Safari decode error on overlapping append (regression in startup) #6441

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tvinko commented May 24, 2024

What version of Hls.js are you using?

What browser (including version) are you using?

What OS (including version) are you using?

Test stream

Configuration

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Checklist

Steps to reproduce

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Chrome media internals output

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