Tutorials Developer

A History of Video Codecs and Compression

History · ~20 min

Overview

Digital video's biggest practical obstacle was never capturing an image. It was the sheer data size of storing or transmitting many images per second, and video codec history is the story of compression techniques making that data size manageable enough for consumer storage and, eventually, internet delivery.

What You Need

No equipment required. This is a reference and context guide, not a hands-on tutorial

Steps

The uncompressed data problem (pre-1990s)

Raw, uncompressed digital video is enormous, even modest resolutions and frame rates produce data rates that quickly exceeded what consumer storage and networks of the 1980s-90s could handle at all, making digital video a research curiosity rather than a practical consumer format for years after digital audio (CDs) had already gone mainstream.

MPEG and the first practical compression standards (1990s)

The Moving Picture Experts Group's MPEG-1 (1993) and MPEG-2 (mid-1990s) standards introduced the compression techniques still conceptually underlying modern codecs: encoding most frames as differences from previous frames (since consecutive video frames are usually very similar) rather than storing every frame independently, plus discarding visual detail human perception is least sensitive to. The same principle MP3 audio compression used around the same era. MPEG-2 specifically made DVD and digital broadcast television practical.

H.264 and the internet video era (2000s-2010s)

H.264/AVC (finalized 2003) dramatically improved compression efficiency over MPEG-2, and its timing, arriving just as broadband internet was becoming widespread, made it the codec that enabled YouTube, Blu-ray, and smartphone video recording all at once. It remains among the most widely supported and used codecs decades after its release specifically because of this near-universal hardware and software support, even though newer codecs compress more efficiently.

Modern high-efficiency codecs (2010s-present)

H.265/HEVC and the royalty-free AV1 codec both significantly improve compression efficiency over H.264, enabling 4K and higher-resolution streaming over the same or lower bandwidth, but adoption has been slower and more fragmented than H.264's was, partly due to licensing costs and disputes (a real factor in AV1's creation as a royalty-free alternative) and partly because H.264's near-universal support makes switching costly for platforms and device manufacturers.

Pro Tips

Every codec since MPEG-1 uses some version of 'store most frames as differences from nearby frames, not independently', understanding this explains why fast motion and scene cuts compress worse than static shots.
H.264's continued dominance decades after newer, more efficient codecs exist is a case study in how installed hardware/software support can outweigh pure technical superiority.
AV1's royalty-free licensing (in contrast to H.264/H.265's patent licensing costs) is a direct response to real industry friction over codec licensing fees, not just a technical choice.

Knowledge Base

What You'll Learn

Video codec history is fundamentally about making an enormous data problem small enough for real storage and networks, and the same difference-frame-encoding principle established in the 1990s still underlies every modern codec.

Quick Timeline

Pre-1990s: Uncompressed digital video impractical at consumer scale.
1993-mid 1990s: MPEG-1 and MPEG-2 make DVD/digital broadcast practical.
2003: H.264/AVC enables the internet video era.
2010s-present: H.265/HEVC and AV1 push higher-resolution streaming.

Why This Still Matters

This site's own H.264 vs H.265 comparison and export-settings tutorials assume the compression history above, knowing why H.264 remains so widely used despite newer, more efficient options helps explain real-world export setting tradeoffs rather than treating 'newest codec' as automatically 'best choice'.

Where This Fits

This guide covers one specific part of the history of media technology. The wider picture — how each link in the chain from capture through transmission to display was actually built, who built it, and why the credit so often landed somewhere else — is in A History of Broadcast Technology: The Chain From Capture to Screen, which frames the discipline as a whole and links out to the detailed guides underneath it, including this one. If you are starting from scratch rather than solving a specific problem, read that first and come back here.

FAQ

Q: If AV1 and H.265 compress better than H.264, why is H.264 still so common?
A: H.264 has near-universal hardware decoding support across two decades of devices, while newer codecs face slower, more fragmented adoption due to licensing costs/disputes (for H.265) and newer, less universally supported hardware decoding (for AV1), installed base and compatibility often outweigh pure compression efficiency in format choice.

Q: What does 'compression efficiency' actually mean for a codec?
A: It means how much visual quality a codec can preserve at a given file size (or how small a file it can produce at a given quality level). A more efficient codec lets you stream or store the same perceived quality at a lower bitrate, which matters directly for bandwidth costs and mobile data usage.