Source media:<br>
<video controls>
<source src="tools.mp4" type='video/mp4;  codecs="avc1.4D401E, mp4a.40.2"'>
<!--source src="a.webm" type='video/webm; codecs="vp8, vorbis"'>
<source src="a.ogv"  type='video/ogg;  codecs="theora, vorbis"'-->
</video>
<hr>
Result media:<br>
<video controls>
<source src="output2.mp4" type='video/mp4;  codecs="avc1.4D401E, mp4a.40.2"'>
</video>
<hr>
<pre>