WebRTC: Fail to publish RTC automatically for HTML5. Unable to obtain permission for automatic streaming, but it does not fail.

[winlinvip]

Reproduction path:

1. Run SRS: ./objs/srs -c conf/rtc.conf
2. Open the webpage for streaming: http://localhost:8080/players/rtc_publisher.html?autostart=true
3. Phenomenon: The camera permission dialog box does not pop up, it keeps spinning and there are no errors or success.

Solution:

    if (query.autostart === 'true') {
        var autoStartPublish = async function() {
            // For autostart, solution #1.
            const detectStream = await navigator.mediaDevices.getUserMedia({audio:true, video:true});
            detectStream.getTracks().map(track => track.stop());

            // For autostart, solution #2.
            //await new Promise(resolve => setTimeout(resolve, 1000));

            await startPublish();
        };
        autoStartPublish();
    }
});
</script>
</body>
</html>

In JavaScript, it is not possible to retrieve it. It must be done in an HTML page by adding the code in the HTML page.

1. When calling getUserMedia in an HTML page, a permission dialog box will definitely pop up.
2. When calling setTimeout in an HTML page, it will also pop up after waiting for a certain amount of time, but if the duration is too short, it won't work.

The main issue is with permissions. If the dialog box below pops up, then there won't be any problem.

This issue is only encountered for the first time, so it affects newcomers.

TRANS_BY_GPT3

[winlinvip]

We discussed in the WebRTC group with everyone:

1. Is it an HTTPS issue? No, it's not. It's on localhost, and even when switched to HTTPS, the same problem occurs.
2. Can the WebRTC example be used? No, it can't. It requires manual clicking to start streaming, not automatic.
3. Does manual streaming work? Yes, it works fine.

TRANS_BY_GPT3

[winlinvip]

With the help of the ringing, wait for the page to load and finish parsing before calling getUserMedia.

If it is not convenient to update the code, you can consider setting autostart=false.

TRANS_BY_GPT3

[winlinvip]

Fixed by 7771fbe

Thank you again @notedit

TRANS_BY_GPT3