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Sync one video to another

The situation is like this - I have two videos, positioned on top of each other. These videos are almost the same (content wise), when you enter the page, video 1 starts playing. There is also a button, which when pressed should sync the second video to the first one and slowly fadeIn (it's hidden at first).
The problem I am having is with the syncing, when I try to set the currentTime of the second video, the player obviously first buffers some frames and after that starts playing, causing desync. I also tried some syncing timeouts with setting currentTime each 10ms until the second video's readyState turns to 4, but that causes pretty big delay.
The code I am using so far:
function switchVideo(first, second) {
var currentTime = first.currentTime;
second.pause();
second.currentTime = currentTime;
second.play();
syncAllowed = true;
var videoInterval = setInterval(function() {
if(next.readyState >= 4) {
second.addClass('show');
syncAllowed = false;
setTimeout(function() {
first.pause();
}, 500);
clearInterval(videoInterval);
}
}, 100);
}
var syncVideos = setInterval(function() {
if(syncAllowed) {
second.currentTime = first.currentTime;
}
}, 10);
So the question is, is there any way to sync one video to another one that is already playing, without having too much delay for the first video to get enought data for playing after setting it's current time? Also I noticed that there is a little bit of lag going backwards in time, which is weird, because that portion of video should already be buffered.
Thanks for any tips!

'Pop noise' sounds when audio paused with Javascript

I have an audio tag in my html, and which I have .wav inside it. With Javascript, I select audio tag and play the wav., which I trigger using a keyboard key. What I am trying to achieve is, for example, on press of each 'A' key, replay the .wav/play the sound from the beginning)
The playing of the audio works okay, and so does the pause too. However, I get a pop noise, while directly pausing the playing .wav.
var audio = document.getElementById(sound);
if (!isPlaying(audio)) {
audio.play(); // works
} else {
audio.pause(); // pops on this line; I checked with commenting below lines.
audio.currentTime = 0;
audio.play();
}
I found this answer, and as far as I understand, it's happening because I instantly set the volume to 0; but I couldn't figure it out for my case. I believe using a fader with setInterval is not a good approach
I also found audio.muted = true, and tried using it before pausing the volume (and used audio.muted = false just before playing the audio), but this also gives pop noise
Update:
I think I need to use fade out to work around this issue. Is there a way to fade out audio instantly?

Update:
I think I need to use fade out to work around this issue. Is there a
way to fade out audio instantly?
You can use .animate() to animate volume property from current value to 0
var audio = $("audio");
$("button").click(function() {
if (audio[0].volume > 0) {
audio.animate({volume:0});
// call `.pause()` here
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<audio controls src="https://upload.wikimedia.org/wikipedia/commons/6/6e/Micronesia_National_Anthem.ogg"></audio>
<button>fade out audio</button>

Control start position and duration of play in HTML5 video

We have a video (13 minutes long) which we would like to control using HTML5. We want to be able to let our users control and select the parts of the video they want to play. Preferably this control would be through 2 input fields. They would input start time (in seconds) in first box and input duration to play (in seconds) in second box. For example, they might want to start the video 10 seconds in and play for 15 seconds. Any suggestions or guidance on the Javascript needed to do this?
Note: I have found the following:
Start HTML5 video at a particular position when loading?
But it addresses only starting at a particular time, and nothing with playing the video for a specified length of time.

You could use the timeupdate event listener.
Save the start time and duration time to variable after loadedmetadata event.
// Set video element to variable
var video = document.getElementById('player1');
var videoStartTime = 0;
var durationTime = 0;
video.addEventListener('loadedmetadata', function() {
videoStartTime = 2;
durationTime = 4;
this.currentTime = videoStartTime;
}, false);
If current time is greater than start time plus duration, pauses the video.
video.addEventListener('timeupdate', function() {
if(this.currentTime > videoStartTime + durationTime){
this.pause();
}
});

If you are able to set start time and end time of video while setting the video url.
you can specify the start and end time in the url itself like
src="future technology_n.mp4#t=20,50"
it will play from 20th second to 50th second.

There are a lot of nuances to using the javascript solution proposed by Paul Sham. A much easier course of action is to use the Media Fragment URI Spec. It will allow you to specify a small segment of a larger audio or video file to play. To use it simply alter the source for the file you are streaming and add #t=start,end where start is the start time in seconds and end is the end time in seconds.
For example:
var start = document.getElementById('startInput').value;
var end = document.getElementById('endInput').value;
document.getElementById('videoPlayer').src = 'http://www.example.com/example.ogv#t='+start+','+end;
This will update the player to start the source video at the specified time and end at the specified time. Browser support for media fragments is also pretty good so it should work in any browser that supports HTML5.

Extend to michael hanon comments:
IE returns buffered.length = 0 and seekable.length = 0. Video doesn't play. So solution:
src="video.mp4#t=10,30"
will not works in IE. If you would like to support IE only way is to use javascript to seek video just after start from 0 second.

If video = duration stop and rewind

I'm making a HTML5 video player. I want it so that when the movie stops the play these executes
video.pause();
video.currentTime=0;
document.getElementById('message').innerHTML="Finished";
I tried this but it didn't work
function rewsi() {
var video = document.getElementsByTagName('video')[0];
if (video.currentTime==video.duration) {
video.pause();
video.currentTime=0;
document.getElementById('message').innerHTML="Finished";
}
}
Anyone got a solution for this problem?
Problem = My lack of knowledge in JavaScript

Looking at the following question and asnwer:
HTML5 <video> callbacks?
I would assign a callback to be executed when the video has actually ended like so:
var Media = document.getElementsByTagName('video')[0];
var Message = document.getElementById('message');
Media.bind('ended',function(){
Message.innerHTML = "The media file has completed";
});
You also stated that when the media 'stops' you want to pause the video, can you describe your motives for doing that ?
The next on the agenda is the video resetting as such, looks like you want to set the position of the media to the start if the media stops, you must first make sure that your determining that the video has not been paused, as you do not want to reset the position if the user has gone to make a cup of coffee.
If you only want to set the media position when the movie has actually ended then this would be pointless (unless you have a valid reason to do so), the reason it would be pointless is that when the user clicks play after it has ended, the default action html5 media player takes is to set the position to 0.
The above solution should work out exactly right for you.
i will recommend using Kaltura HTML5 Video Library to help you manage the media player.

First, you can check if the video has ended by simply putting a condition on video.ended. Then you can set the time with this.currentTime(0);

HTML5 Playlist plays 2 videos, How about 4 or 5?

I'm able to get two videos to play sequentially, (and without pause!) with this code from Apple, (see section 2-4)...
https://developer.apple.com/library/content/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/ControllingMediaWithJavaScript/ControllingMediaWithJavaScript.html
...Yet completely lost as to how to play a 3rd or 5th video. Trouble is I'm a Javascript noob :-(, so if you figure this out please share as much of your code as possible.

The first video's ended => Start second video
The second video's ended => Start third video
The third video's ended => Start fourth video
The fourth video's ended => Start first video
It's just redefining the ended event handler nonstop...
You could also use a variable starting at 0. increment it each time and set SRC to i%video_count
var i = 0;
var sources = ["http://www.a.com/blargh.m4v", "http://www.b.com/blargh.m4v"];
videoElement.addEventListener('ended', function(){
videoElement.src = sources[(++i)%sources.length];
videoElement.load();
videoElement.play();
}, false);
...The above code assumes the video is already playing onload, like your example