Why this comparison matters
H.264 and AV1 are both video codecs that developers meet in real projects. H.264 is the long-established default, while AV1 is the newer option. This article looks at the practical differences: efficiency, encoding cost, device support, licensing, tooling and how to choose. It does not give benchmark numbers, because results depend too much on your own content and setup.
Compression efficiency and quality
AV1 is generally designed to reach similar visual quality at lower bitrates than H.264. The size of that gain depends on the content, the encoder and its settings. Headline claims rarely match your material, so test with your own clips. Compare encodes at the same bitrate or the same quality target, and judge them with both objective metrics and your own eyes.
Encoding cost and speed
AV1 encoding is typically more compute-heavy than H.264 encoding. Software encoders give you the most control over quality, but they can be slow at the more demanding settings. Hardware encoders are faster and cheaper to run at scale, though they usually trade away some compression efficiency. For on-demand workflows you can spend extra compute once and benefit on every playback. For live streaming the encoder must keep up in real time, so H.264 is often the easier fit unless you have suitable hardware.
Decoding and device support
H.264 decodes almost everywhere, including old phones, set-top boxes and browsers. AV1 hardware decoding is spreading but is not universal. Where hardware decoding is missing, players may fall back to software decoding. That fallback can raise CPU use and drain batteries faster, and it may cause dropped frames on weaker devices.
Licensing and ecosystem
H.264 involves patent licensing pools. AV1 was developed by an industry alliance as a royalty-free format. Terms change and depend on how you distribute video, so check the current conditions for your use case.
Containers, tooling and integration
Both codecs can be packaged in common containers such as MP4, and AV1 is also commonly used in WebM. FFmpeg, browsers and many players support both, but the level of support varies by version and build. For adaptive streaming, each rendition in a ladder is encoded separately, so a codec choice multiplies your encoding and storage work. Verify your packaging and player stack with real test streams before committing.
How to choose
Start from your audience: which devices and browsers do viewers actually use? Then weigh latency needs and your encoding budget. Many teams offer both codecs, with AV1 for capable devices and H.264 as the fallback in the ladder.
- Check which devices your audience uses and whether they decode AV1 in hardware.
- Decide whether the workflow is live or on demand.
- Test both codecs on your own content at matched quality.
- Estimate encoding time, compute and storage for each ladder.
- Review current licensing terms for your distribution model.
- Keep H.264 as the fallback rendition.