Nimble Streamer adds Opus, FLAC, AC3, EAC3, VP8 and VP9 to RTMP via the Enhanced RTMP spec

Veovera's Enhanced RTMP spec has been around for a bit - it's what brought HEVC and AV1 into RTMP - and now Softvelum has implemented the latest additions to the spec in Nimble Streamer.

The newly supported codecs:

• Audio: Opus, FLAC, AC3 (Dolby Digital), EAC3 (Dolby Digital Plus)
• Video: VP8, VP9

Crucially, this works across all four RTMP modes - receive, pull, republish, and playback - so you're not limited to just ingest. Full passthrough in all directions.

A few things this unlocks in practice:

**WebRTC → RTMP without transcoding.** VP8/VP9/Opus are native WebRTC codecs. Previously getting browser-captured content into an RTMP pipeline meant a forced transcode. No longer.

**Lossless audio ingest.** FLAC over RTMP means you can preserve source audio quality end-to-end before your final distribution encode.

**Broadcast surround passthrough.** AC3 and EAC3 are everywhere in broadcast/OTT. Being able to receive and republish these natively without unwrapping and re-encoding saves real resources.

Full technical breakdown: https://softvelum.com/2026/05/enhanced-rtmp-vp8-vp9-opus-flac-ac3-nimble-streamer/