Everything you need to know about OGV
OGV (Ogg Video, .ogv) is the video variant of Xiph.org's open-source Ogg container, paired with Theora video and Vorbis audio codecs. Created in 2007 as a patent-free alternative to MP4/H.264, it briefly powered HTML5 video on Firefox before being eclipsed by WebM and modern royalty-free options.
How it works under the hood
- Pure open source. Ogg, Theora, and Vorbis are all royalty-free and patent-free. Created specifically to give the web an unencumbered video format.
- Theora codec. A 2008 derivative of On2's VP3 codec. Decent compression but significantly behind H.264, VP9, and AV1.
- Multiplexed streams. Ogg natively supports multiple parallel streams (video, audio, captions) interleaved at packet level, designed for live streaming.
- Bitstream packets. Ogg uses fixed-size 'pages' containing variable-size packets, enabling network-friendly chunking unlike MP4's atom layout.
Where you'll actually use it
- Wikipedia and Wikimedia Commons (their preferred video format)
- Open-source projects requiring zero patent encumbrance
- Educational and government sites with open licensing requirements
- Older Firefox-only HTML5 video before WebM/VP9 took over
How it compares to alternatives
OGV vs WebM: WebM (VP9) compresses 30-40% better than Theora at same quality. OGV vs MP4: H.264 is more efficient, more widely supported. OGV exists today only because it predates WebM and is grandfathered into specs.
Things that will trip you up
- Safari has never supported Ogg/Theora natively
- Theora is markedly less efficient than VP9 - your files will be ~40% larger at equivalent quality
- Most modern browsers prefer WebM if both are offered - serve OGV only as fallback for archival reasons
Test it yourself: VLC plays Ogg natively. Firefox is the most reliable browser for HTML5 OGV playback. Convert with `ffmpeg -i input.ogv -c:v libx264 -c:a aac output.mp4`.