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On sites where you convert a YouTube link to an embedded player (which apparently doesn't include MSO, so I can't put an example directly in this post), can you use 16:9 aspect ratio instead of 4:3? It's much more common these days. Here's an example

How it is today

Example of 16:9 YouTube video embedded in 4:3 player.

How it could be

Example of 16:9 YouTube video embedded in 16:9 player.

share|improve this question
so... why all the downvotes? – Kip May 30 '11 at 16:02
Downvotes here usually mean disagreement, so people probably don't like your proposal. – mc10 May 30 '11 at 16:58
Yeah.... not sure about the downvotes on this one? Could someone explain? (+1 so it gets back on the homepage) – Jon Seigel May 30 '11 at 17:27
Maybe they don't care for widescreen. Maybe you didn't provide a good enough reason. Maybe there's no point. Maybe widescreen isn't as common as you think for those things that are illustrated via YouTube videos. – random May 31 '11 at 19:39
The YouTube API will actually give the video ratio, so SE shouldn't have to decide which ratio to use: it should ask YouTube. – TRiG is Timothy Richard Green Feb 18 '15 at 14:43
up vote 14 down vote accepted

Starting with the next build, youtube embeds will be 640x385px (25px for the player), a 16:9 ratio.

This won't affect existing posts, since the conversion is done at the time of a save/edit. If you want a post to switch to the new format, simply edit it.

share|improve this answer
Woohoo! Thanks. – Adam Davis Feb 24 '12 at 18:20
Sweet, thank you good sir. – Matthew Read Feb 24 '12 at 18:43
up vote 19 down vote

For anyone who would like this, I wrote a Grease Monkey script to fix it. You can find it over on StackApps.

Edit: That StackApps link is dead, unless you have enough rep to view deleted posts. I deleted it because there's no need for it anymore; as noted in accepted answer, they made this change in the StackExchange code.

For anyone interested in the code from a purely academic perspective, here it is:

// ==UserScript==
// @name           StackExchange embedded YouTube in 16:9
// @namespace      stackexchange
// @description    Changes YouTube videos embedded in StackExchange pages to use widescreen format.
// @include*
// @include*
// @include*
// @include*
// @include*
// @include*
// @include       http://**
// @author         Kip Robinson -
// ==/UserScript==

(function() {

  function with_jquery(f) {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.textContent = "(" + f.toString() + ")(jQuery)";

  with_jquery(function($) {
      var attrs = {width: 640, height: 360};
        attrs.height = 390; //for some reason, embedded YouTube player uses different settings in Chrome
share|improve this answer
Thank you for this, +1 for the script – Maverik Aug 1 '11 at 10:54
That URL has been removed. The link is broken. – Denilson Sá Feb 18 '15 at 0:17
@DenilsonSá updated with the source code. Although you don't need a browser extension anymore to do this. – Kip Feb 18 '15 at 14:40

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