Faulty playback of Alternate-Audio Playlists with Primary/Backup, if Primary returns 404 (since hls.js 0.8.3) #1438

netTrekfd · 2017-11-21T07:38:25Z

Environment

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
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 latest reference client on http://video-dev.github.io/hls.js/demo and not just on my page

Link to playable M3U8 file:
https://apiproxy.akamaized.net/hlsjs/av/master_prim_faila.m3u8 or
https://apiproxy.akamaized.net/hlsjs/multichannelaudio/master_prim_fail_v1a.m3u8
Hls.js version: broken since 0.8.3
Browser name/version: Google Chrome 62.any
OS name/version: OS X 10.11

Steps to reproduce

Open (broken since 0.8.3, same in any newer version) http://streambox.fr/mse/hls.js-0.8.3/demo/?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined
The stream does not startup - "error while loading level playlist"
In version 0.8.2: http://streambox.fr/mse/hls.js-0.8.2/demo/?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined
The stream automatically switches to the backup stream (as Primary returns 404!)

Expected behavior

hls.js supports fallback to backup-renditions in older versions, but it generally seems to fail on playlists with GROUP-IDs, supporting alternate audio.

More info on Primary/Backup-Playlists:
https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/UsingHTTPLiveStreaming/UsingHTTPLiveStreaming.html#//apple_ref/doc/uid/TP40008332-CH102-SW22

More info on Error-Handling for HTTP-Live-Streaming:
https://developer.apple.com/videos/play/wwdc2017/514/

Actual behavior

there is a final "error while loading level playlist" instead of falling back to the backup source.

Console output

[log] > loadSource:https://apiproxy.akamaized.net/hlsjs/av/master_prim_faila.m3u8
logger.js:37 [log] > trigger BUFFER_RESET
logger.js:37 [log] > set autoLevelCapping:-1
logger.js:37 [log] > attachMedia
logger.js:37 [log] > media source opened
logger.js:37 [log] > manifest loaded,1 level(s) found, first bitrate:1288815
logger.js:37 [log] > startLoad(-1)
logger.js:37 [log] > switching to level 0
logger.js:37 [log] > loading playlist for level 0
logger.js:37 [log] > main stream:STOPPED->IDLE
logger.js:37 [log] > audio tracks updated
logger.js:37 [log] > subtitle tracks updated
xhr-loader.js:80 GET https://apiproxy.akamaized.net/hlsjs/av/av-1400-p/prog_index.m3u8 404 (Not Found)
loadInternal @ xhr-loader.js:80
load @ xhr-loader.js:39
load @ playlist-loader.js:217
onLevelLoading @ playlist-loader.js:170
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:84
trigger @ hls.js:88
setLevelInternal @ level-controller.js:177
set @ level-controller.js:151
set @ level-controller.js:372
set @ hls.js:245
startLoad @ stream-controller.js:88
(anonymous) @ hls.js:178
startLoad @ hls.js:178
onManifestParsed @ stream-controller.js:898
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
onManifestLoaded @ level-controller.js:120
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loadsuccess @ playlist-loader.js:530
readystatechange @ xhr-loader.js:117
XMLHttpRequest.send (async)
loadInternal @ xhr-loader.js:80
load @ xhr-loader.js:39
load @ playlist-loader.js:217
onManifestLoading @ playlist-loader.js:166
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loadSource @ hls.js:173
loadStream @ ?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:285
(anonymous) @ ?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:258
logger.js:37 [error] > 404 while loading https://apiproxy.akamaized.net/hlsjs/av/av-1400-p/prog_index.m3u8
(anonymous) @ logger.js:37
readystatechange @ xhr-loader.js:121
XMLHttpRequest.send (async)
loadInternal @ xhr-loader.js:80
load @ xhr-loader.js:39
load @ playlist-loader.js:217
onLevelLoading @ playlist-loader.js:170
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:84
trigger @ hls.js:88
setLevelInternal @ level-controller.js:177
set @ level-controller.js:151
set @ level-controller.js:372
set @ hls.js:245
startLoad @ stream-controller.js:88
(anonymous) @ hls.js:178
startLoad @ hls.js:178
onManifestParsed @ stream-controller.js:898
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
onManifestLoaded @ level-controller.js:120
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loadsuccess @ playlist-loader.js:530
readystatechange @ xhr-loader.js:117
XMLHttpRequest.send (async)
loadInternal @ xhr-loader.js:80
load @ xhr-loader.js:39
load @ playlist-loader.js:217
onManifestLoading @ playlist-loader.js:166
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loadSource @ hls.js:173
loadStream @ ?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:285
(anonymous) @ ?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:258
logger.js:37 [warn] > level controller,levelLoadError for level 0: switching to redundant stream id 1
(anonymous) @ logger.js:37
onError @ level-controller.js:273
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loaderror @ playlist-loader.js:560
readystatechange @ xhr-loader.js:122
XMLHttpRequest.send (async)
loadInternal @ xhr-loader.js:80
load @ xhr-loader.js:39
load @ playlist-loader.js:217
onLevelLoading @ playlist-loader.js:170
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:84
trigger @ hls.js:88
setLevelInternal @ level-controller.js:177
set @ level-controller.js:151
set @ level-controller.js:372
set @ hls.js:245
startLoad @ stream-controller.js:88
(anonymous) @ hls.js:178
startLoad @ hls.js:178
onManifestParsed @ stream-controller.js:898
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
onManifestLoaded @ level-controller.js:120
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loadsuccess @ playlist-loader.js:530
readystatechange @ xhr-loader.js:117
XMLHttpRequest.send (async)
loadInternal @ xhr-loader.js:80
load @ xhr-loader.js:39
load @ playlist-loader.js:217
onManifestLoading @ playlist-loader.js:166
onEventGeneric @ event-handler.js:65
onEvent @ event-handler.js:53
EventEmitter.emit @ events.js:96
trigger @ hls.js:88
loadSource @ hls.js:173
loadStream @ ?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:285
(anonymous) @ ?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:258
?src=https%3A%2F%2Fapiproxy.akamaized.net%2Fhlsjs%2Fav%2Fmaster_prim_faila.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&dumpfMP4=false&levelCapping=-1&defaultAudioCodec=undefined:528 {type: "networkError", details: "levelLoadError", fatal: false, url: undefined, loader: XhrLoader, …}

The text was updated successfully, but these errors were encountered:

netTrekfd · 2017-11-21T07:43:44Z

This is pretty curious - if i click on the demo link (#1 in steps to reproduce) the playback starts. But if you reload the demo-page it's getting broken.
In version 0.8.2 or below this seems to work fine.

nitrat7 · 2017-11-21T11:03:55Z

Thanks @netTrekfd for opening this ticket!

one note:
hls.js Support for Primary/Backup Failover for HLS-Streams with Alternate Audio
e.g. https://apiproxy.akamaized.net/hlsjs/multichannelaudio/master_prim_fail_v1a.m3u8
has never worked (at least tested with hls.js 0.62-0.87).

mangui · 2017-11-27T08:02:22Z

I gave it a try and this commit broke something between 0.8.2 and 0.8.3 (stream controller is stuck in IDLE if first level request fails ...)
but then while rechecking against 0.8.7 I found out that a second thing has been broken : the logic dealing with switching to redundant level in case level request fails has been removed (most probably by #1346)
ping @NicolasSiver

NicolasSiver · 2017-11-27T21:46:42Z

I'm going to look into this. What exactly we had in 0.8.2 which would drive a switch to backup stream for a level manifest.

NicolasSiver · 2017-11-28T04:29:22Z

With latest changes it works:

I will push PR soon.

netTrekfd · 2017-12-12T19:16:04Z

Thanks @NicolasSiver for providing the fix. I can confirm that the first of my sample streams now is playable.
But the error persists for my second sample (multiaudio playlist) where both the primary video & primary audio manifests are broken:
https://apiproxy.akamaized.net/hlsjs/multichannelaudio/master_prim_fail_v1a.m3u8

Can you please check and reopen?
Thanks!

netTrekfd · 2018-01-05T09:08:53Z

@NicolasSiver @mangui Could you please recheck this issue with my teststream (see comment above). I think the switching logic is still broken. Or shall i create a new ticket for it?
Thanks!

tchakabam · 2018-01-05T12:18:23Z

@netTrekfd Hey! I tested and indeed the 404 error doesn't recover well. Would need to look further into this. Feel free to contact me directly.

tchakabam · 2018-03-26T21:45:28Z

@netTrekfd this might fix this issue in a simple way ^ :) check it out.

tchakabam · 2018-04-04T14:00:40Z

Re-opening this as it is not fixed on master yet, see PR #1630 which fixes this partly (but not merged yet).

tchakabam · 2018-04-04T14:05:17Z

Here is an updated description of the issue which is partly solved by above PR

Status:

Video/Audio Variant-Playlists of Primary will return HTTP 404 and can not be played back, but Video/Audio Variant-Playlists and Subtitle-Playlists of Backup are playable.

Expected behavior:

The Player should be able to playback a HLS-LiveStream with faulty Primary-Variant-Playlists, but working Backup-Variant Playlists.
On start of Playback, Status of primary is faulty (HTTP 404), backup is OK.

Sample-Playlist:
https://apiproxy.akamaized.net/hlsjs/multichannelaudio/master_prim_fail_v1a.m3u8
https://apiproxy.akamaized.net/hlsjs/zdf/check_primfail4.m3u8

stale · 2018-06-15T21:01:06Z

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

NicolasSiver self-assigned this Nov 28, 2017

NicolasSiver added the Bug label Nov 28, 2017

NicolasSiver mentioned this issue Nov 29, 2017

Add Level Manifest recovery #1452

Merged

5 tasks

NicolasSiver closed this as completed in #1452 Dec 4, 2017

tchakabam self-assigned this Mar 22, 2018

tchakabam mentioned this issue Mar 26, 2018

Redundant streams fallback behavior for alternate renditions with multiple media groups #1630

Merged

5 tasks

tchakabam reopened this Apr 4, 2018

tchakabam mentioned this issue May 16, 2018

Hitch in playback on live A/B failover as buffer drains without refilling #1707

Closed

4 tasks

stale bot added the Wontfix label Jun 15, 2018

stale bot closed this as completed Jun 22, 2018

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Faulty playback of Alternate-Audio Playlists with Primary/Backup, if Primary returns 404 (since hls.js 0.8.3) #1438

Faulty playback of Alternate-Audio Playlists with Primary/Backup, if Primary returns 404 (since hls.js 0.8.3) #1438

netTrekfd commented Nov 21, 2017 •

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netTrekfd commented Nov 21, 2017

nitrat7 commented Nov 21, 2017

mangui commented Nov 27, 2017

NicolasSiver commented Nov 27, 2017 •

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NicolasSiver commented Nov 28, 2017

netTrekfd commented Dec 12, 2017

netTrekfd commented Jan 5, 2018

tchakabam commented Jan 5, 2018 •

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tchakabam commented Mar 26, 2018

tchakabam commented Apr 4, 2018

tchakabam commented Apr 4, 2018 •

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stale bot commented Jun 15, 2018

Faulty playback of Alternate-Audio Playlists with Primary/Backup, if Primary returns 404 (since hls.js 0.8.3) #1438

Faulty playback of Alternate-Audio Playlists with Primary/Backup, if Primary returns 404 (since hls.js 0.8.3) #1438

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netTrekfd commented Nov 21, 2017 • edited Loading

Environment

Steps to reproduce

Expected behavior

Actual behavior

Console output

netTrekfd commented Nov 21, 2017

nitrat7 commented Nov 21, 2017

mangui commented Nov 27, 2017

NicolasSiver commented Nov 27, 2017 • edited Loading

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netTrekfd commented Dec 12, 2017

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