Chrome On The Dev Branch (version 66) May Block Audio For Unity WebGL

To give even more contexts, its after the download of the unityweb file is complete and its trying to parse it. I do have to note that this is in a web environment where i don't support gzip, so i guess its falling back on the Unity Gzip decompression. Probably the bottleneck lies here.

 

Ok i have verified the issue, in my testing environment i didn't set Content-Encoding: gzip on unityweb files. And for some reason the fallback to the internal decompressor breaks it, but i solved it on my end by setting the encoding!

 

This story is so funny.

First, because google have annouced the change in September 2017 ==> https://developers.google.com/web/updates/2017/09/autoplay-policy-changes and no one of the unity staff have worked on it.

The warning has been present since a long time in google canary version, so that mean that the unity staff do not test anything on the beta version of the web browser vendors. If i'm wrong then this situation would never have happened

Kognito1 have made this post 3 months ago ^^

Now, one and a half years later (after the google announcement), we are at the same point. It's normal for you?

I respect you guy but Schubkraft tell us "There is currently no workaround, but we're still looking into it." and i found a workaround myself 24 hours after. Marco-Trivellato (thank you for finding this workaround) give us a solution that should work but hard to setup for for no exerimented user and no tested in production.

This kind of situations should never happen because the web browser vendors give us the tools (beta version) and information at the right time.

A new black screen and texture bug is present in the developer version of firefox (not sure yet if the bug come from firefox or unity). I can bet 50 dollars that if i do not report it myself, Unity or firefox (according from where come the bug) will wake up when everybody will be affected

I have hear that the unity team work closely with the web browser vendors. I must say that it's a complete fail when we see that something like this happen.

Anyway, writting a complet book will not change anything.

I love all of you guy but something like that should never happen. But in same time, you can't work on the Unity 2048 and on the current Unity version in same time It's not your fault (i hope) but the fault of your boss.

Have a good day !

Your lovely grumpy french monkey

 

Works with any event, not necessarily a click (button), i use onmouseover to launch the audio and works fine... try https://gzone.pro

 

Sorry, but your solution is not 100 % reliable.

https://imgur.com/a/kagSizT

First image, only the background music is stoped and button sound work.
Second image : backround and button sound are not working.

My system work in 100% of the case, you must review your testing process.

 

Does anybody know of a mac solution for the compressing/uncompressing? I'm getting "Invalid or unexpected token" on Chrome and "SyntaxError: illegal character" on Firefox. I assume that it's an issue with the encoding like Erik had, but I can't find 7za on mac to solve it.

 

Thanks! I will look into the 7za tool, its doing a better job than regular gzip

If anyone is interested in the shell script, when your as lazy as i am and you have to fix many games:
(confirmed working on MAC)

Code (CSharp):

1. #!/bin/sh
2. FILE=$(find . -name '*.asm.framework.unityweb' -exec basename {} +)
3. echo 'fixed '$FILE
4. mv $FILE $FILE.gz
5. gunzip $FILE.gz
6. gsed -i.bak 's#function _JS_Sound_Init(){try{window.AudioContext=window.AudioContext||window.webkitAudioContext;WEBAudio.audioContext=new AudioContext;WEBAudio.audioWebEnabled=1}catch(e){alert("Web Audio API is not supported in this browser")}}#function _JS_Sound_Init(){try{window.AudioContext=window.AudioContext||window.webkitAudioContext;WEBAudio.audioContext=new AudioContext();var tryToResumeAudioContext=function(){if(WEBAudio.audioContext.state==="suspended")WEBAudio.audioContext.resume();else{clearInterval(resumeInterval)}};var resumeInterval=setInterval(tryToResumeAudioContext,400);WEBAudio.audioWebEnabled=1}catch(e){alert("Web Audio API is not supported in this browser")}}#g' $FILE
7. rm $FILE.bak
8. gzip --best $FILE
9. mv $FILE.gz $FILE
10.  

Some steps to make this work:
save the above file as fixUnityAudio.sh
Run chmod +x fixUnityAudio.sh to mark it a shell script
Navigate to your Build folder and run fixUnityAudio.sh and your script should be fixed!

 

I still can't seem to get this to work. Modifying the file manually or using Erik's shell script still give me the illegal character error. I'm running the build locally so this isn't a web config problem. Do I need to change the 7za settings or anything?

 

Unfortunately I can't share it due to NDA, I'll give the unmute button a go though. Thanks

 

Do you mind sharing how you created the preloader, I really need it

 

Just check the source code of my page and understand what i do.
I don't want that someone broke his load build just by copying and pasting the code.

Some adjustment can be done according how you load your game but just by checking the source code of the page, you have the idea and the complet project.

 

Thank you for this exemple, i'm sure that it will help a lot of guy.

The only problems "for me" is that one part of the game is downloaded before the button and when we press the button , we have a "freeze/blank" time before the complet load. It's just my 2 cents just for my point of view.

But this exemple will be perfect for a lot of peoples.

 

Hello,

I am just adding my supporting vote that this is very important to an organization i am working with as well. We have a QA team who will all be working around it and a client who will be trying the product off and on in the coming weeks. I know there is always a lot to do but this is a very important issue for us. Thank you!

-Logan

 

We discovered that if you click on the page while the webgl app is loading, it WILL load audio for you. Just in case you need to try it. Not a viable workaround but a neat one.

 

I've implemented the above function _JS_Sound_Init() replacement solution in a PostProcessBuild function, but have hit problems generating a new *.asm.framework.unityweb file. The fix works if I do not gzip the file - all good. However, when I gzip it (using the Unity tools 7za a -tgzip approach suggested above), the game will error on loading with the invalid character error also reported above.

I have tracked the problem down to the newly generated .gz file NOT having the following comment in the gzip header block - 'UnityWeb Compressed Content (gzip)'. I can manually edit the binary file to add this comment, and it all works as expected. I'd rather not have to do this, and wondered what tool Unity is using to insert this comment when the file is originally packaged?

 

Yes just edit the Audio.js file as described here.

To be clear: you only need to edit the .unityweb file itself if you do not want to make a new build. If you're making a new build just edit the Audio.js file in your Unity installation folder.

 

We'd rather not do that, as we are a large team, and would need to make that change on all development machines and build machines.

 

I can appreciate the challenge. I just sent the Audio.js file as an attachment with instructions on how to find the original and replace it with the new one. It didn't seem like a big deal. But we also only really *need* the fix on our build machine. All other builds are more or less prototypes which we can workaround (ignore) the chrome issue. Hopefully the fix is coming to a patch release soon.

 

I changed the "JS_Sound_Init()" in the Audio.js file, and then I tried to build an older project, but nothing changed. I even went ahead and erased the contents of the Audio.js file, and I still got audio playing in the newest build. Every change to the Audio.js is ignored when I rebuild the project, what am I doing wrong?

 

Check that your Chrome hasn't been updated already. Google patched it last night, and this problem has gone away for the time being.

 

I'm getting this as well, I have edited the Audio.js file in the unity installation folder as instructed. Then I rebuilt the game.
However, if I unzip the framework file and read it, I see the OLD function present and not the new one I put in Audio.js.

Any idea whats up with that?

 

Updating chrome to a newer version does remove the problem, but I shouldn't expect users to have that version.

I was using version 66.0.3359.170, in which the audio is still blocked if no input is given, however, my problem is that Unity is not using Audio.js to build my project, because any changes made to that file are ignored, as I said above.

 

https://unity3d.com/unity/whatsnew/unity-2018.1.4

Seems fixed in 2018.1.4 and 2018.2 (beta)!

 

Hey Marco,
is there an ETA when the next 2017.4 LTS is coming out?

Best,
Patrick

 

@Marco-Trivellato
We still have the warning message :
"The Web Audio autoplay policy will be re-enabled in Chrome 70 (October 2018). Please check that your website is compatible with it. https://goo.gl/7K7WLu" even by using the version 2018.2.5f1. It's normal?

 

Tested on :

Unity 2018.1.2f1 and 2018.2.5f1
Chrome Canary : 70.0.3538.0

Test link (Default setup): https://www.asr-games.net/Testing/Terrain/

The warning is still present.

Thank you

 

Hum sorry, i have misunderstood. I have tested 2/3 game (because the mine use a button/gesture) and it seems that everything is working correctly.

 

I have the exact same issue: audio only starts after 15 seconds or so. This only occurs in Chrome, it wasn't occuring before, and it only occurs in wasm builds, asm builds are fine. I've updated to the latest Unity, but that didn't fix the issue.

 

sound does not ring but different error on console ...

I already tried to create a play button and everything placed here ...

Do you have any solutions for this?

link:
https://www.arcadecodex.com/games/temp/jogomemoriapinguinhoweb3/

version unity:
2018.2.18f1 Personal


Error console:

 

@Marco-Trivellato, help

 

Tried everything in this thread and elsewhere, nothing seems to works flawlessly with Safari 12 on macOS.

 

You can try adding this code. I forget whether it needs to be called before or after UnityLoader.instantiate, but probably before is best.

This starts the sound on the first click or keypress in the game.

You can see it in action by going to any game on SIMMER.io and checking out any game w/ audio https://simmer.io/@QuangHaiVu/marble-adventure

It's important to note that you need to go directly to a game and not click around in the UI first to get a real use case.

Let me know if this works!

It basically hijacks the audioContext and starts audio on Gesture.

Code (JavaScript):

1.   function startAudioOnClick(){
2.  
3.     window.AudioContext = window.AudioContext || window.webkitAudioContext;
4.     var bind = Function.bind;
5.     var unbind = bind.bind(bind);
6.  
7.     function instantiate(constructor, args) {
8.       return new (unbind(constructor, null).apply(null, args));
9.     }
10.  
11.     window.AudioContext = function (AudioContext) {
12.       return function () {
13.         var audioContext = instantiate(AudioContext, arguments);
14.         window.myAudioContext = audioContext;
15.         console.log('AudioContext has been instantiated!');
16.         return audioContext;
17.       }
18.     }(AudioContext);
19.  
20.     var webAudioEnabled = false;
21.  
22.     function resumeAudio(){
23.       if (!webAudioEnabled && window.myAudioContext){
24.         console.log('SIMMER starting Audio!');
25.         window.myAudioContext.resume();
26.         webAudioEnabled = true;
27.       }
28.     }
29.  
30.     document.body.addEventListener('click', resumeAudio, true);
31.     document.addEventListener('keydown', resumeAudio, true);
32.   }

 

This works! Thank you!

 

Excellent @mikewilliams76901 great to have confirmation that it's working for somebody else.

 

It works for us too! I’ve been off on vacation for a bit but my coworkers report this broke Chrome for us (perhaps our unique setup?) so we only use it if the browser is Safari 12 or later. Many thanks though!

 

I got the same problem on iOS platform with Safari Web browser. I have tried the solution from TheRoccoB, but it can't work. Anyone has a solution for it?

 

Hi,
I tried the solution too using unity 2018.2. But it doesn't work for me. Any help?