Rendre le carrousel bootstrap réactif en hauteur

J'ai besoin de personnaliser BS carrousel, pour rendre la taille des images sensibles corectly.
J'ai besoin de le manège à s'adapter à la hauteur de l'actif des images initiel hauteur.
Lorsque la fenêtre est plus large que l'image, de l'image/diapositive devrait échelle, mais conserver les proportions.
Lorsque la fenêtre est plus petite que l'image de l'échelle vers le bas, mais conserver les proportions.

J'ai essayé beaucoup de variations, mais ne peut pas trouver la bonne solution.

Je l'espère, un peu de css/js expert peut m'aider ici.

Voici mon balisage:

<!-- Carousel
================================================== -->
<div id="myCarousel" class="carousel slide" data-ride="carousel" data-pause="true">
<!-- Indicators -->
<ol class="carousel-indicators">
<li data-target="#myCarousel" data-slide-to="0" class="active"></li>
<li data-target="#myCarousel" data-slide-to="1"></li>
<li data-target="#myCarousel" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="item active"><!--data-src="holder.js/900x500/auto/#777:#7a7a7a/text:First slide"-->
<img src="MediaContent/Images/Unika%20kobbertryk%201.jpg" alt="First slide">
<div class="container">
<div class="carousel-caption">
<h1>Example headline.</h1>
<p>Note: If you're viewing this page via a <code>file://</code> URL, the "next" and "previous" Glyphicon buttons on the left and right might not load/display properly due to web browser security rules.</p>
<p><a class="btn btn-lg btn-primary" href="#" role="button">Sign up today</a></p>
</div>
</div>
</div>
<div class="item"> <!--data-src="holder.js/900x500/auto/#666:#6a6a6a/text:Second slide" -->
<img src="MediaContent/Images/Unika%20kobbertryk%202.jpg" alt="Second slide">
<div class="container">
<div class="carousel-caption">
<h1>Another example headline.</h1>
<p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
<p><a class="btn btn-lg btn-primary" href="#" role="button">Learn more</a></p>
</div>
</div>
</div>
<div class="item"><!--data-src="holder.js/900x500/auto/#555:#5a5a5a/text:Third slide"-->
<img src="MediaContent/Images/Unika%20kobbertryk%203.jpg"  alt="Third slide">
<div class="container">
<div class="carousel-caption">
<h1>One more for good measure.</h1>
<p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Donec id elit non mi porta gravida at eget metus. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
<p><a class="btn btn-lg btn-primary" href="#" role="button">Browse gallery</a></p>
</div>
</div>
</div>
</div>
<a class="left carousel-control" href="#myCarousel" data-slide="prev"><span class="glyphicon glyphicon-chevron-left"></span></a>
<a class="right carousel-control" href="#myCarousel" data-slide="next"><span class="glyphicon glyphicon-chevron-right"></span></a>
</div><!-- /.carousel -->

Et voilà mon actuellement css, qui ne fonctionne pas comme desciped. Cette version me donne un fixe de 500 px de hauteur, et une image qui perd ratio d'aspect lorsque la fenêtre est plus petite que la largeur de l'image.

/* GLOBAL STYLES
body {
padding-bottom: 40px;
color: #5a5a5a;
}
/* CUSTOMIZE THE NAVBAR
-------------------------------------------------- */
/* Special class on .container surrounding .navbar, used for positioning it into place. */
.navbar-wrapper {
position: absolute;
top: 0;
left: 0;
right: 0;
z-index: 20;
}
/* Flip around the padding for proper display in narrow viewports */
.navbar-wrapper .container {
padding-left: 0;
padding-right: 0;
}
.navbar-wrapper .navbar {
padding-left: 15px;
padding-right: 15px;
}
/* CUSTOMIZE THE CAROUSEL
-------------------------------------------------- */
/* Carousel base class */
.carousel {
min-height: 500px;
margin-bottom: 60px;
}
/* Since positioning the image, we need to help out the caption */
.carousel-caption {
z-index: 10;
}
/* Declare heights because of positioning of img element */
.carousel .item {
min-height: 500px;
background-color: #777;
}
.carousel-inner > .item > img {
position: absolute;
top: 0;
left: 0;
min-width: 100%;
min-height: 500px;
}
/* MARKETING CONTENT
-------------------------------------------------- */
/* Pad the edges of the mobile views a bit */
.marketing {
padding-left: 15px;
padding-right: 15px;
}
/* Center align the text within the three columns below the carousel */
.marketing .col-lg-4 {
text-align: center;
margin-bottom: 20px;
}
.marketing h2 {
font-weight: normal;
}
.marketing .col-lg-4 p {
margin-left: 10px;
margin-right: 10px;
}
/* Featurettes
------------------------- */
.featurette-divider {
margin: 80px 0; /* Space out the Bootstrap <hr> more */
}
/* Thin out the marketing headings */
.featurette-heading {
font-weight: 300;
line-height: 1;
letter-spacing: -1px;
}
/* RESPONSIVE CSS
-------------------------------------------------- */
@media (min-width: 768px) {
/* Remove the edge padding needed for mobile */
.marketing {
padding-left: 0;
padding-right: 0;
}
/* Navbar positioning foo */
.navbar-wrapper {
margin-top: 20px;
}
.navbar-wrapper .container {
padding-left:  15px;
padding-right: 15px;
}
.navbar-wrapper .navbar {
padding-left:  0;
padding-right: 0;
}
/* The navbar becomes detached from the top, so we round the corners */
.navbar-wrapper .navbar {
border-radius: 4px;
}
/* Bump up size of carousel content */
.carousel-caption p {
margin-bottom: 20px;
font-size: 21px;
line-height: 1.4;
}
.featurette-heading {
font-size: 50px;
}
}
@media (min-width: 992px) {
.featurette-heading {
margin-top: 120px;
}
}

Toute aide appréciée.

source d'informationauteur Depete