H.264 (also called AVC, Advanced Video Coding) is the most widely supported video codec in the world - hardware decoders for it are in practically every phone, browser, TV, and set-top box made in the last fifteen years. That universality makes it the safe baseline rung of any OTT codec strategy: if a device can play anything, it can play H.264.
Its weakness is efficiency. Newer codecs (HEVC, AV1) reach the same quality at roughly 30-50% lower bitrate, so serving everything in H.264 means paying more for delivery. The common pattern is to offer H.264 for guaranteed compatibility and layer more efficient codecs on top for devices that support them.
The handbook · 7 volumes
Fora Soft Video Engineering Handbook
H.264 is the codec that plays on almost every device, which makes it the safe baseline rung even when newer codecs save bandwidth. The seven volumes cover the video stack; for H.264 start with Volume 1 on H.264 encoding, rate control, and quality metrics, then Volume 2 on packaging, with device playback in Volume 3. Written by Nikolay Sapunov, CEO at Fora Soft.
Deciding how long to keep H.264 as your baseline codec?
We will review your device mix and bitrate costs and send a codec plan showing where H.264 stays and where HEVC or AV1 pays off. 250+ video products shipped since 2005.
