RecordRTC example (and other examples) doesn't work on iOS 12

Expected Behavior

Record audio multiple times.

Current Behavior

Recording audio is possible only 4 times. On 5th try there is an alert with error.

Failure Information

null is not an object (evaluating 'context.createMediaStreamSource')

Steps to Reproduce

1. Open https://www.webrtc-experiment.com/RecordRTC/ using iOS 12 (or any other example like https://www.webrtc-experiment.com/RecordRTC/simple-demos/audio-recording.html ).
2. Use default recording parameters.
3. Click on “Start recording” and “Stop recording” 4 times.
4. On 5th try you will see an error.

Context

• Operating System: iOS 12.1.4
• Browser: latest Safari

Screenshot

[alexbazilev]

@Tayyaba03 I went to PROJECT_FOLDER/node_modules/recordrtc/RecordRTC.js and applied this instead of lines 2879-2890 (RecordRTC version is 5.5.4):

if (typeof RecordRTC.Storage === 'undefined') {
        RecordRTC.Storage = {
            AudioContextConstructor: null,
            AudioContext: window.AudioContext || window.webkitAudioContext
        };
    }

    if (!RecordRTC.Storage.AudioContextConstructor || RecordRTC.Storage.AudioContextConstructor.state === 'closed') {
        RecordRTC.Storage.AudioContextConstructor = new RecordRTC.Storage.AudioContext();
    }

    var context = RecordRTC.Storage.AudioContextConstructor;

This is not a good approach, because there is also RecordRTC.min.js that may probably be used for production bundle creation. What is more, “npm install” command may remove these temporary changes. So it is better to use pull request directly (https://stackoverflow.com/questions/33181297/npm-install-from-github-pull-request) or wait @muaz-khan to update the library. But for my current development purpose it works like a charm.

[xcloarec]

Hi everyone, I had exactly the same issue with my project.

@thaihau the example audio-recording.html mentioned by @alexbazilev use StereoAudioRecorder on Safari browser which is working well, except the context problem which is limiting the number of uses.

I managed to solve this by using RecordRTC.Storage within StereoAudioRecorder, so the audio context can be closed when calling RecordRTC.destroy().

I created a pull request for this : https://github.com/muaz-khan/RecordRTC/pull/504