Mp4

MP4 is a multimedia container format standard with the file extension .mp4

Webm

WebM is an open video encoding standard by Google



Bigger 720p 33mb

Example

"Converted webm file is bigger in size than original mp4 original mp4 of 720p was 33mb but 640p webm is 76mb"

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Optimizing Adaptive Streaming with FFMPEG

"I tried mp4 and webm and sometimes the file size after i convert to mp4 is smaller than webm but it is also sometimes larger than the original file size"

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Best video format using ffmpeg converter

Others

Example

The mp4 implementation is more widely used and wouldn t require a webm fallback in most browsers

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Google Chrome does not want to play mp4 using mediaelement.js

Webm is usually more robust than mp4 which can be all over the place

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HTML5 video loop doesn't work on Chrome (Sitefinity CMS)

Probably webm will load faster than standard mp4 but i am not so familiar with webm format

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WebM with VP9 vs MP4 with H.264 AVC which one is best overall

Be sure mp4 comes first;webm - webm is higher quality than ogg so browsers that support both will choose webm first if listed in this order

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How to serve OGG video to Firefox 3.6 and WEBM video to Firefox 4?

The mp4 video doesn t work under firefox 29.;but the webm version is ok

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AVI to MP4 - ffmpeg conversion

Also it looks like when i transcode webm to mp4 2.7 is 30 faster than webm

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Ffmpeg performance issue when transcoding to webm

The ogv version of the video seems to run a little better than the webm which itself seems to run better than the mp4

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Controlling a HTML5 Video via offset-position ends in a performance fiasko

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