Supported Codecs

Supported Codecs

Nyan Streaming runs on an in-house developed streaming server and does not transcode (re-encode) video on the server side. The supported audio formats are AAC and PCM (s16be). PCM (s16be) received over RTSP is converted to AAC when viewers use a non-RTSP playback method. You must stream using supported codecs; unsupported codecs can result in missing video or audio.

Basic Codecs

Type	Supported Codecs
Video	H.264 (AVC)
Audio	AAC (MPEG-4 Audio), PCM (s16be)

The standard is H.264 for video and AAC for audio. This combination is guaranteed to work over any route, whether streaming (RTMP / RTSP / WebRTC) or viewing (HLS / RTSP / RTMP / WebRTC).

Caution

Video codecs such as AV1 / VP9 / VP8 / H.265 (HEVC) are not supported. In encoder settings such as OBS, always select H.264.

Additional Supported Audio Codecs

The following audio formats are supported in addition to the basic codecs.

• PCM (s16be / uncompressed, highest audio quality) — PCM (s16be) ingest is available only through RTSP push. RTSP playback can deliver PCM (s16be), while non-RTSP playback methods such as HLS, RTMP, and WebRTC deliver the audio as AAC.
• Opus — Available for WebRTC (WHIP streaming / WHEP viewing).
• RTSP playback with PCM (s16be) — Environments such as AV Pro / Windows Media Foundation that cannot properly play AAC over RTSP can receive RTSP audio as PCM (s16be).

About Viewing in VRChat

Caution

VRChat only supports playback of the following codecs.

• Video: H.264
• Audio: AAC (MPEG-4 Audio), PCM (s16be, RTSP playback only)

For VRChat, we recommend viewing over RTSP, which has the lowest latency. For per-player settings, see Configuring/Checking the Video Player.