I was trying to implement the Screen Recording With Video and a logo using the RecordRTC library but found out that while using the example shown in
https://www.webrtc-experiment.com/RecordRTC/simple-demos/show-logo-on-recorded-video.html
results in segmented audio in the recording.
Here is a reproducible fiddle: https://jsfiddle.net/kiran589/L34bdhu7/5/
The code is like:
var videoPreview = document.getElementById('video-preview');
var logoImage = document.getElementById('logo-image');
var waitImage = document.getElementById('wait-image');
navigator.mediaDevices.getUserMedia({video: true, audio: true}).then(function(camera) {
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
canvas.style = 'position: absolute; top: 0; left: 0; opacity: 0; margin-top: -9999999999; margin-left: -9999999999; top: -9999999999; left: -9999999999; z-index: -1;';
document.body.appendChild(canvas);
var video = document.createElement('video');
video.autoplay = true;
video.playsinline = true;
video.srcObject = camera;
var canvasStream = canvas.captureStream(15);
var audioPlusCanvasStream = new MediaStream();
// "getTracks" is RecordRTC's built-in function
getTracks(canvasStream, 'video').forEach(function(videoTrack) {
audioPlusCanvasStream.addTrack(videoTrack);
});
// "getTracks" is RecordRTC's built-in function
getTracks(camera, 'audio').forEach(function(audioTrack) {
audioPlusCanvasStream.addTrack(audioTrack);
});
var recorder = RecordRTC(audioPlusCanvasStream, {
type: 'video'
});
recorder.setRecordingDuration(10 * 1000).onRecordingStopped(function() {
var blob = recorder.getBlob();
recorder = null;
camera.stop();
videoPreview.srcObject = null;
videoPreview.src = URL.createObjectURL(blob);
});
recorder.startRecording();
videoPreview.srcObject = canvasStream;
var tries = 0;
(function looper() {
if(!recorder) return; // ignore/skip on stop-recording
tries += 100;
canvas.width = 320;
canvas.height = 240;
// show hello.png for one second
if(tries < 5000 || tries > 6000) {
context.drawImage(video, 0, 0, canvas.width, canvas.height);
// context.drawImage(logoImage, parseInt(canvas.width / 2) - parseInt(logoImage.width / 2), canvas.height - logoImage.height - 10);
// context.drawImage(logoImage, parseInt(canvas.width / 2) - parseInt(32 / 2), canvas.height - 32 - 10, 32, 32);
context.drawImage(logoImage, 10, 10, 32, 32);
}
else {
context.drawImage(waitImage, 0, 0, canvas.width, canvas.height);
}
// repeat (looper)
setTimeout(looper, 100);
})();
}).catch(function(error) {
alert('Unable to capture camera. Please check console logs.');
console.error(error);
});
If you go to the link and start recording, and say aaaaaaaaaaaaaaaaaaaa
, then the recording outputs the audio like aaaa
aaa
aaa
.
Is this a bug in RecordRTC?
Is there any way to get smooth audio and video in the recording while using canvas recording?
Thanks for your help in advance.