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how to play videos one after another without gap

I have a folder with several hundred mp4 files of 2sec duration each.
I would like to play them one after the other without any glitch between them.
I have tried what is advised in Playing videos one after another in html5 but this does not solve the glitch problem between video transitions.
<video width="256" height="192" id="myVideo" controls autoplay>
<source src="../uploads/VID_190923141334_20190923_141336.mp4" id="mp4Source" type="video/mp4">
Your browser does not support the video tag.
</video>
<script type='text/javascript'>
var player=document.getElementById('myVideo');
var mp4Vid = document.getElementById('mp4Source');
player.addEventListener('ended',myHandler_ended,false);
function myHandler_ended(e)
{
mp4Vid.src = "../uploads/VID_190923141334_20190923_141338.mp4";
player.load();
player.play();
}
</script>
Can anyone point me to the right direction in order to eliminate the glitch in each video transition?

The "2 players 1 hidden" method is not stable: it does not work on mobile devices, and it will lag on older/slower computers when switching one player to another. I wanted to create a live stream with this method, but it's an ugly DIY, don't do that.
There is an HTTP Live Streaming (HLS) standard and with it you can continuously play small m3u8 (.ts) chunks (it is supported by videoJS and OBS also has m3u8 recording support).
I made live streams on Sia Skynet, which is a static (non-modifiable) decentralized storage for files (like IPFS, but different). Here you can find some demos & the source code: https://github.com/DaWe35/Skylive

One approach is to have two video elements and players on your page - this approach is often used for pre, mid and post roll adverts, which are often from a different source than the main video itself.
The two video elements are in the same place on the page, one over the other.
You play the first video and when you are near the end of it preload and then pause the second video but keep the player hidden.
At the point where the first video ends, you hide the first player and show and start the second player.
You then again preload and pause the next video in the player you have just hidden and it becomes the one ready to start when the one now playing is finished.
The snippet below hides the second video until the first has ended and then plays the second one hiding the first. This is just a rough outline you can play with where you cue the movies to etc. If you leave your pointer over the video you can watch the timeline - films fade in and out so it may not be obvious it is playing.
Hover over the video ion the snippet while it is playing to see the time as it switches from one to the other.
var vid1 = document.getElementById("MyVid1");
var vid2 = document.getElementById("MyVid2");
vid2.style.display = "none"
vid1.onloadeddata = function() {
vid1.currentTime = 872;
vid1.play()
};
vid2.onloadeddata = function() {
vid2.currentTime = 10; //Just to illusrate as begining is black screen
vid2.pause()
};
vid1.onended = function() {
vid2.play()
vid1.style.display = "none"
vid2.style.display = "block"
};
<video id="MyVid1" width="320" height="176" controls preload="auto">
<source src="http://peach.themazzone.com/durian/movies/sintel-1024-surround.mp4" type="video/mp4">
Your browser does not support this video format
</video>
<video id="MyVid2" width="320" height="176" controls preload="auto">
<source src="http://ftp.nluug.nl/pub/graphics/blender/demo/movies/ToS/tears_of_steel_720p.mov" type="video/mp4">
Your browser does not support this video format
</video>

Html5 video Scroll video

I've a problem with the scroll control of video. I took this code : http://codepen.io/ollieRogers/pen/lfeLc/.
var frameNumber = 0, // start video at frame 0
// lower numbers = faster playback
playbackConst = 500,
// get page height from video duration
setHeight = document.getElementById("set-height"),
// select video element
vid = document.getElementById('v0');
// var vid = $('#v0')[0]; // jquery option
// dynamically set the page height according to video length
vid.addEventListener('loadedmetadata', function() {
setHeight.style.height = Math.floor(vid.duration) * playbackConst + "px";
});
// Use requestAnimationFrame for smooth playback
function scrollPlay(){
var frameNumber = window.pageYOffset/playbackConst;
vid.currentTime = frameNumber;
window.requestAnimationFrame(scrollPlay);
}
window.requestAnimationFrame(scrollPlay);
And it work in all browsers with the video of codepen but when I put my test video, it's not smooth, I try a lot of differents codecs or formats (example with my test video : http://www.dugautiertheo.fr/videoscroll/).
I don't know why but it work fine and very smooth on Safari only.
Can you help me ?
Thank you

Per the first comment listed, it does appear to be something with the video. However, one additional thing to try would be to supply multiple video source files per the code provided in codepen.io this way you let the browser decide what is the best video type/codec to use. As shown below:
<video id="v0" tabindex="0" autobuffer="autobuffer" preload="preload">
<source type="video/webm; codecs="vp8, vorbis"" src="http://www.html5rocks.com/tutorials/video/basics/Chrome_ImF.webm"></source>
<source type="video/ogg; codecs="theora, vorbis"" src="http://www.html5rocks.com/tutorials/video/basics/Chrome_ImF.ogv"></source>
<source type="video/mp4; codecs="avc1.42E01E, mp4a.40.2"" src="http://www.html5rocks.com/tutorials/video/basics/Chrome_ImF.mp4"></source>
<p>Sorry, your browser does not support the <video> element.</p>
</video>

Problems arise, when grabing single frames in an highly compressed video container format like .mp4 etc with js. Our solution was to provide the video as a .json in a lottie animation:
scroll video example
You can check the source code.

Control Netflix player using JavaScript

I would like to make a Chrome extension that is able to control the Netflix player.
The current Netflix player is written in HTML5 as far as I can tell, so I was wondering if there is a way to control the player, e.g. play, pause, volume control and changing the position of the video.
I've tried using this to control the playing and pausing functions and it works.
document.getElementsByClassName("player-control-button player-play-pause")[0].click();
I've also tried using but then I just get an error saying that videoPlayer() isn't a function
netflix.cadmium.objects.videoPlayer();
Is there something similar I can do to change the volume and the position of the video?
Thanks!

First get the <video> element as variable e.g. by:
media = document.getElementById("netflixVideoPlayer");
After that you can control the volume.
To mute the sound:
media.volume = 0
Turn the volume to 100%:
media.volume = 1
Turn the volume to 60%:
media.volume = 0.6
Start the video:
media.start();
Pause the video:
media.pause();

HTML5 audio louder while playing

I've got a code like this:
var upsound = new Audio('sound/upsound.mp3')
upsound.loop = true;
upsound.play();
I would like to get the volume louder while the audio is playing.

Use the volume property for this, which goes from 0.0 (mute) to 1.0 (full volume):
upsound.volume = 1.0;
Edit:
If you want to set the volume up after a certain delay, you can simply use a timeout:
usound.volume = 0.0; // Start with no sound
setTimeout(function() {
usound.volume = 1.0; // Increase the volume after 2 seconds
}, 2000);

Volume attribute for audio should be the solution but until now, it seems like it is not been incorporated in any browsers. Check Browser Compatibility for Audio files. You can use something like this which will give you controls to use during playing but through coding, it is not yet possible.
<audio controls="controls">
<source src="foo.wav" type="audio/wav">
</audio>

HTML5: Manually "playing" a video inside a canvas, in IOS Safari

So, here's what I'm trying to do:
I want to load a video into a video element, but not have it played in the "normal" way.
Using a timed interval, calculated according to the movie's framerate, I want on each iteration to
A. Manually advance the video one 'frame' (or as close as possible to that).
B. Draw that frame into a canvas.
Thereby having the video "play" inside the canvas.
Here's some code:
<video width="400" height="224" id="mainVideo" src="urltovideo.mp4" type="video/mp4"></video>
<canvas width="400" height="224" id="videoCanvas"></canvas>
<script type="text/javascript">
var videoDom = document.querySelector("#mainVideo");
var videoCanvas = document.querySelector("#videoCanvas");
var videoCtx = null;
var interval = null;
videoDom.addEventListener('canplay',function() {
// The video's framerate is 24fps, so we should move one frame each 1000/24=41.66 ms
interval = setInterval(function() { doVideoCanvas(); }, 41.66);
});
videoDom.addEventListener('loadeddata',function() {
videoCtx = videoCanvas.getContext('2d');
});
function doVideoCanvas() {
videoCtx.drawImage(videoDom,0,0);
//AFAIK and seen, currentTime is in seconds
videoDom.currentTime += 0.0416;
}
</script>
This works perfectly in Google Chrome, but it doesn't work in an Iphone's Safari;
The video frames does not get drawn at all to the canvas.
I made sure that:
The video events I hooked into does get triggered (did 'alerts' and they were shown).
I have control over the canvas (did a 'fillRect' and it filled).
[I also tried specifying dimensions in the drawImage - it didn't help]
Is drawImage with a video object not applicable at all in Iphone Safari...?
Even if I'll manage to find a way to capture the video frames, there are also some other issues in the Iphone's browser:
Access to the currentTime property of the video is only granted once the video has started playing (in a standard way). I thought about maybe somehow "playing it hidden" and then capturing, but didn't manage to do that. Also thought of maybe somehow start playing the video and then immediately stop it;
There doesn't seem to be any way to forcefully start the playing of a video in the IOS Safari. video.play(), or autoplay doesn't seem to do anything. Only if the user taps the "play circle" on the video then the video starts playing (taking all over the screen, as usually with videos on the IPhone's browser).
Once the video plays - the currentTime property does get forwarded. On the video itself. When you pause the video and go back to the normal html page - you can see the frames on the video element changing. Though, in a slow phase (unlike in Google Chrome, where the rate seems to be smooth enough to make it look like it's playing) - in the iphone it looks to be a rate of something like 2-3 frames per second maybe. It stays the same even if I try changing the interval timing, I guess there's a minimum time limit that the browser on the IPhone can handle.
"Bonus question" :)
- When the frames on the video element progresses from the event - the circle "play button" is visible on the video element (since it is not actually 'playing'). Is there anyway to hide it and make it invisible?
This has been tested on Iphone 3GS (with both 3G and Wifi) and Iphone 4, both running IOS 5, both having the same results as described.

Unfortunately I don't have an iOS device to test this, but I don't think you need to actually capture the video frames in the way that you're attempting using the currentTime property. The usual process looks something like this:
create a video element without controls (omit the controls attribute)
hide the element
when the video is playing draw it to the canvas on an interval
As you've discovered, iOS devices do not support autoplay on HTML5 video (or indeed audio) but you can create a separate control to initiate playback of the video using the play() method.
This approach should solve the issue you're having with the play button being visible since in this case you are actually playing the video.

I don't believe the loadeddata event is called on iOS, try the loadedmetadata event instead. I also found it necessary on iOS to call the videoDom.load() method after setting videoDom.src.
For my use case, I need to do a "dRAF" (double requestAnimationFrame) after the seeked event to ensure something was actually drawn to the canvas rather than a transparent rectangle.
Try something like:
videoDom.onloadedmetadata = () => {
videoCanvas.height = videoDom.videoHeight
videoCanvas.width = videoDom.videoWidth
videoDom.currentTime = 0
}
videoDom.onseeked = () => {
// delay the drawImage call, otherwise we get an empty videoCanvas on iOS
// see https://stackoverflow.com/questions/44145740/how-does-double-requestanimationframe-work
window.requestAnimationFrame(() => {
window.requestAnimationFrame(() => {
videoCanvas.getContext('2d').drawImage(videoDom, 0, 0, videoCanvas.width, videoCanvas.height)
videoDom.currentTime += 0.0416
})
})
}
videoDom.load()
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