ScheduleController 'start denied'

[jakubfrydrych]

Hi,
I'm trying to play an extra short video, 0.1 seconds duration.
Player does not work and ScheduleController returns logging 'start denied'.
Player end event will not be triggered.

I tried this on the demo page https://videojs.github.io/videojs-contrib-dash/

Output from console:
[219] [ScheduleController][ video ] stop
[221] [ScheduleController] Stream is complete
[404] Got enough buffer to start for video
[1898] Native video element event: play
[1899] [StreamController][onPlaybackStarted]
[1899] [ScheduleController][ video ] start denied

Source video on url:
https://prima-vod-prep.ssl.cdn.cra.cz/test/_definst_/prima/0000/1516/cze-sd1-T41NgApU.smil/manifest.mpd

Thanks for reply,
Jakub

[epiclabsDASH]

Hi @jakubfrydrych, that issue is not reproducible in latest version of dash.js although I got another one. Independently of implementing a fix, is this a real use case? Videos of 0.1 seconds doesn't seem "usable".

[jakubfrydrych]

Hi @epiclabsDASH,
how do you think it is not reproducible? I tried it on version 2.6.7 and the result seems the same.

The usecase is such that a number of preroll ads are played, and when the player event ends, player reinitializes with another set of preroll ads. A video with a length of 0.1sec serves to complete full playback, including sending all events.

[epiclabsDASH]

@jakubfrydrych, just trying in dash reference player. I don't get any issue when testing your stream.

[dvdobrovolskiy]

Got this in 2.7.0

[834306] [StreamController][onPlaybackStarted]
dash.all.min.js?ver=1.0:18 [834306] [ScheduleController][ video ] start denied
dash.all.min.js?ver=1.0:18 [834306] Native video element event: waiting
dash.all.min.js?ver=1.0:18 [838716] Native video element event: pause
dash.all.min.js?ver=1.0:18 [838717] [StreamController][onPlaybackPaused]
dash.all.min.js?ver=1.0:18 [879981] Native video element event: play
dash.all.min.js?ver=1.0:18 [879981] [StreamController][onPlaybackStarted]
dash.all.min.js?ver=1.0:18 [879981] [ScheduleController][ video ] start denied
dash.all.min.js?ver=1.0:18 [879981] Native video element event: waiting
dash.all.min.js?ver=1.0:18 [892716] Native video element event: pause
dash.all.min.js?ver=1.0:18 [892716] [StreamController][onPlaybackPaused]
dash.all.min.js?ver=1.0:18 [945027] Native video element event: play
dash.all.min.js?ver=1.0:18 [945027] [StreamController][onPlaybackStarted]
dash.all.min.js?ver=1.0:18 [945027] [ScheduleController][ video ] start denied
dash.all.min.js?ver=1.0:18 [945027] Native video element event: waiting

Also I trying to find out why PLAYBACK_ENDED not fired. Non of solution mentioned in previous issued helped

player.on(dashjs.MediaPlayer.events.PLAYBACK_ENDED, function (e) {
console.log("End");
});

[mvirbicianskas]

it could be reproducible if you load some static file and have <video loop /> attribute in there

[epiclabsDASH]

Hi @dvdobrovolskiy, @mvirbicianskas. Issue is fixed in dash.js v3 (#3003). It is not a easy to test stream but in the new version end event is raised after "playing" 0.1 seconds (of black screen?) and then playback restart.

Could you please test it using this url http://dashjsv3.surge.sh/samples/dash-if-reference-player/index.html and let me know if you are ok with the result?

[PolynomialDivision]

Hmmm, I facing the same problem:

twitchtv/acm-mmsys-2020-grand-challenge#8