Как отобразить первый кадр видео элемента в HTML
Try appending #t={seconds} to the end of your src value. Here's an example:
<video width="300" height="150">
<source src="testvideo.mp4#t=0.1" type="video/mp4" />
</video>
It works fine on Chrome/Firefox and many other browsers.
Mlifonza