Ant Media details codec tradeoffs for streaming pipelines
This article defines what a codec is, explains how video and audio codecs function in streaming workflows, and details commonly used codecs such as H.264, H.265, VP8, VP9, AV1, AAC, and Opus. It provides guidance on selecting appropriate codecs based on factors like compression efficiency, latency, and device compatibility. Ant Media Server's support for these various codecs across different streaming protocols is highlighted.
Key Takeaways
- H.264 remains the broadest-compatibility option, with hardware decoder support across devices made since 2008 and delivery over RTMP, HLS, DASH, and WebRTC.
- H.265 delivers roughly half the bitrate of H.264 for equivalent quality, but comes with licensing complexity across MPEG-LA, HEVC Advance, and Velos Media.
- AV1 is royalty-free and offers 2.0–2.5x H.264 compression efficiency, but software encoding can require 8–20x the CPU of H.264.
- Opus is the mandatory WebRTC audio codec in RFC 7874 and can run at algorithmic latency as low as 2.5ms.
- AAC is the standard audio codec for HLS and DASH, while MP3 is included in Ant Media Server mainly for RTMP ingest compatibility.
Why It Matters
For streaming teams, this is a practical codec map: H.264 and Opus anchor low-latency WebRTC, while H.265 and AV1 trade encoding cost for lower bitrate in HLS and OTT delivery. The article also ties codec choice to protocol support in Ant Media Server across RTMP, WebRTC, HLS, and DASH, making compatibility as important as compression. The main signal to watch is whether your hardware can handle AV1 real-time encoding, since the article says software AV1 can take 8–20x the CPU of H.264 and production use depends on GPU or specialized encoders.
Read full article at antmedia.io