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WebM vs MP4 | Full Comparison between the Two HTML5 Formats

MP4 or WebM, which one to choose to download a video online, for example from YouTube?

I want to download the music video of a hot Korean drama in HD from YouTube using WinX YouTube Downloader, the available options for 1080p HD videos are:
1920x1080 -> webm - 33.32 MB
1920x1080 -> mp4 - 49.03 MB

1080p MP4 file size is bigger than 1080p WebM. Does that mean the former one owns better video quality than the latter one? Which one should I choose? I just need a good quality.

Best Answer:

WebM is a container format especially created for Internet streaming. This open source video container is developed by Google based on Matroska and encoded by VP8 and Vorbis (updated to VP9 and Opus since 2013).

MP4, abbreviated term for MPEG-4 Part 14, is also a container format following ISO/IEC standard, but more widespread and compatible (than WebM or other formats). Audio, video, subtitles and still images can be contained in a single MP4 file. Moreover, some advanced content like 3D graphics, menus and user interactivity can also be held.

Winner of File Size (Which is Smaller): WebM
Winner of Video Quailty (Which is Better): MP4
Winner of Video Compatibility (Which is More Friendly): MP4

Comparison Between WebM and MP4 in Details

H.264/AAC MP4 and VP8/Vorbis WebM are two main compression settings for HTML5 video[wiki]. Actually, if you want to compare WebM with MP4 in depth, compare H.264 to VP8 is a must-do. Get more detailed information about comparison between H.264 and VP8 in advance.

MP4 and WebM both come in high quality and commonly used for online streaming. One thing that cannot be ignored is that (VP8) WebM video is royalty free while H.264 MP4 is not. But since WebM is specially designed for Internet, the compression ratio of WebM is generally higher than MP4 in theory, which leads to more original quality loss than MP4. And the file size of WebM is a little bit smaller than MP4. When it comes to the compatibility of usage, MP4 (H.264/AAC) is obviously much more universal and friendly to devices, either desktop or mobile. Besides, MP4 is also used in online streaming just like WebM.

MP4 (H.264/AAC) video can be played on any frequently-used devices, e.g iPhone, iPad, Apple TV, Android, Xbox and PSP, as well as browsers like Chrome, Firefox, Edge, Opera, Safari, some of which don't support WebM (VP8) at all.

Many video sites gradually start to support upload MP4 HEVC video, just like YouTube. HEVC compression is more efficient than H.264, but less compatible with playback devices.

webm to mp4

Download & Convert WebM to MP4 and Vice Versa

WinX HD Video Converter Deluxe features free downloading 8K/4K, 1080p/720p HD, and SD movie/music videos to MP4, WebM from over 300 sites including YouTube.

It is also the No.1 fast video covnerter in the market by uniquely enabling multiple CPU cores (up to 8) to simultaneously use QSV and CUDA/NVENC to encode and decode videos. It can convert 4K/8K, AVCHD, MTS, M2TS, MKV, WebM to MP4 format and vice versa at 83x faster real time converting speed. [100% Clean]

download webm mp4 video convert webm to mp4 format

Which Is Better When Downloading Videos Online: From the above analysis, it is easy to draw that if you focus more on video quality and wish to download a video that can be played on whatever devices, MP4 is a better choice. If not, WebM with relatively smaller size is OK.

Fight between VP8 and H.264: Google has axed support for H.264 video codec from Chrome browser since 2011, but bringing about his own open source VP8 to fight against H.264. Years later, although H.264 codec is still the ruling method on both web and mobile, the war between these two codecs is just getting started.

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