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For VLC application the http input caching value is set in Setting > Preferences > Input/Codecs > Access modules > HTTP(S), Advanced options. How to set this value for clients viewing webpage containing a vlc plugin?
VideoLAN wiki ActiveX page provides properties and methods that may be used. Could it be the setVariable method used in what way?

You can add it to the input url string e.g. "http://x.x.x.x:31339/0,100,200,210 :http-caching=1200".

I have MRL value in the form "http://x.x.x.x/stream1", where stream1 is the stream name. Should I add "/0,100,200,210 :http-caching=1200"? What are "0,100,200,210"?

no, it didn't work...
I tried also when there are no stream names, and tried without "0,100,200,210".

What are "0,100,200,210"?

That was the command from my dbox! No you doesn't need that! But "http://x.x.x.x/stream1 :http-caching=1200" should work

thank you, but...
1) the server is launched to stream without stream names.
In the web page
<param name="MRL" value="http://x.x.x.x:2017 :http-caching=10000" />
I get the picture and no difference whether this value "10000" is provided or not. That is, it seems to be ignored.
2) the server is launched to stream with stream names.
In the web page
<param name="MRL" value="http://x.x.x.x/stream01 :http-caching=10000" />
No picture can be get.

Have you tried it to pass the caching params in the options field ?
There it must be an array of strings. I don't know how you can do this in HTML

Now I have found an example I got the idea, and it seems it works.
In a JScript function called on pressing the button, put the code:

var options = new Array();
options.push(":http-caching=10000");
document.vlc.addTarget("<?php echo "$srvr$atdal$fi"; ?>", options, 4+8, 0);
document.vlc.play();

I'm now trying IExplorer, "vlc" is the object id, $srvr contains "http://" with the server address, and $atdal$fi specifies whether or not it comes with the stream name.
In wiki there is an info on addTarget syntax.

Thanks!