Just drop an video from your assets, the video will be automatically converted to the different HTML5 formats and to the correct size.

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#0 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag/Video.php(368): Pimcore\Model\Document\Tag\Video->getErrorCode('Asset is not a ...') #1 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag/Video.php(175): Pimcore\Model\Document\Tag\Video->getAssetCode(false) #2 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag.php(521): Pimcore\Model\Document\Tag\Video->frontend() #3 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag.php(534): Pimcore\Model\Document\Tag->render() #4 /home/www/pim-air-com/pim-air-com/var/cache/dev/twig/5c/5c0b72e27fb9e01199fdc8fcae6b7792a9741cfabc6270945acbcf1108813b66.php(46): Pimcore\Model\Document\Tag->__toString() #5 /home/www/pim-air-com/pim-air-com/vendor/twig/twig/src/Template.php(407): __TwigTemplate_96a7e0c607018ef2b0a7059ddb67c2d7efcb5f85e745d0e46fee0786fac2f010->doDisplay(Array, Array) #6 /home/www/pim-air-com/pim-air-com/vendor/twig/twig/src/Template.php(380): Twig\Template->displayWithErrorHandling(Array, Array) #7 /home/www/pim-air-com/pim-air-com/vendor/twig/twig/src/Template.php(392): Twig\Template->display(Array) #8 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Bridge/Twig/TwigEngine.php(54): Twig\Template->render(Array) #9 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/Templating/DelegatingEngine.php(41): Symfony\Bridge\Twig\TwigEngine->render('Areas/video/vie...', Array) #10 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/lib/Document/Tag/TagHandler.php(261): Symfony\Component\Templating\DelegatingEngine->render('Areas/video/vie...', Array) #11 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/lib/Document/Tag/DelegatingTagHandler.php(129): Pimcore\Document\Tag\TagHandler->renderAreaFrontend(Object(Pimcore\Model\Document\Tag\Area\Info)) #12 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag/Areablock.php(202): Pimcore\Document\Tag\DelegatingTagHandler->renderAreaFrontend(Object(Pimcore\Model\Document\Tag\Area\Info)) #13 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag/Areablock.php(159): Pimcore\Model\Document\Tag\Areablock->content() #14 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag/Areablock.php(94): Pimcore\Model\Document\Tag\Areablock->loop() #15 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag.php(521): Pimcore\Model\Document\Tag\Areablock->frontend() #16 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/models/Document/Tag.php(534): Pimcore\Model\Document\Tag->render() #17 /home/www/pim-air-com/pim-air-com/var/cache/dev/twig/14/14a54a38641bc226e3ff738daf914212a0dda6163ee77645da52b152b15a3b7e.php(89): Pimcore\Model\Document\Tag->__toString() #18 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__TwigTemplate_46568de524e699e3c2ec233cd4c0f79567a0e8d530af3d7ac3f33482e0010042->doDisplay(Array, Array) #24 /home/www/pim-air-com/pim-air-com/vendor/twig/twig/src/Template.php(380): Twig\Template->displayWithErrorHandling(Array, Array) #25 /home/www/pim-air-com/pim-air-com/vendor/twig/twig/src/Template.php(392): Twig\Template->display(Array) #26 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Bridge/Twig/TwigEngine.php(54): Twig\Template->render(Array) #27 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Bundle/TwigBundle/TwigEngine.php(53): Symfony\Bridge\Twig\TwigEngine->render('content/default...', Array) #28 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Templating/DelegatingEngine.php(55): Symfony\Bundle\TwigBundle\TwigEngine->renderResponse('content/default...', Array, Object(Symfony\Component\HttpFoundation\Response)) #29 /home/www/pim-air-com/pim-air-com/vendor/pimcore/pimcore/bundles/CoreBundle/EventListener/LegacyTemplateListener.php(83): Symfony\Bundle\FrameworkBundle\Templating\DelegatingEngine->renderResponse('content/default...', Array) #30 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php(126): Pimcore\Bundle\CoreBundle\EventListener\LegacyTemplateListener->onKernelView(Object(Symfony\Component\HttpKernel\Event\ViewEvent), 'kernel.view', Object(Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher)) #31 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(264): Symfony\Component\EventDispatcher\Debug\WrappedListener->__invoke(Object(Symfony\Component\HttpKernel\Event\ViewEvent), 'kernel.view', Object(Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher)) #32 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(239): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'kernel.view', Object(Symfony\Component\HttpKernel\Event\ViewEvent)) #33 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php(73): Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'kernel.view', Object(Symfony\Component\HttpKernel\Event\ViewEvent)) #34 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php(168): Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object(Symfony\Component\HttpKernel\Event\ViewEvent), 'kernel.view') #35 /home/www/pim-air-com/pim-air-com/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(163): 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