Video url to Ffmpeg command line converter

[something else]

I was using ffmpeg to convert a few video's from .m3u8 to .mp4 and needed a quicker way than copy and pasting.
So i put together a quick javascript script and thought I would share it, as it may help others:

<input id="in" type="text" onkeyup="convert();"/><br/>
<input id="out" type="text"/>
<script>
var counter = 0;
function convert()
{
    var input = document.getElementById('in');
    var output = document.getElementById('out');
    output.value = 'ffmpeg -i "' + input.value + '" Vid-'+ counter + '.mp4';
    output.focus();
    output.select();
    document.execCommand('Copy');
    input.value = '';
    counter++;
}
</script> 

It does copy to clipboard as soon as you have pasted the url in.
However I'm not sure the copy function will work on other browser than chrome