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Best AAC Bitrate for Pre-Recorded Videos on YouTube Live

For stereo AAC on YouTube Live, use 128 Kbps at 44.1 kHz. For 5.1 over RTMP/RTMPS, use 384 Kbps at 48 kHz.
Length2 min Posted Quest giverVGSources Team

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For a stereo AAC feed going to YouTube Live, use 128 Kbps at 44.1 kHz. The recommendation is the same whether your video is prerecorded or captured live: YouTube’s published live-encoder guidance does not specify a separate AAC bitrate for prerecorded playback. For 5.1 surround over RTMP or RTMPS, use AAC at 384 Kbps and 48 kHz.

Recommended AAC settings by channel layout

Audio sent to YouTube Live Protocol Codec Bitrate Sample rate
Stereo RTMP or RTMPS AAC 128 Kbps 44.1 kHz
5.1 surround RTMP or RTMPS AAC 384 Kbps 48 kHz
Stereo HLS AAC, AC3, or EAC3 128 Kbps 44.1 kHz
5.1 surround HLS AAC, AC3, or EAC3 384 Kbps 48 kHz

These are YouTube’s published live-ingest targets; the guidance does not state a different bitrate for prerecorded material. YouTube lists AAC or MP3 for RTMP/RTMPS audio, but 5.1 surround is supported only with AAC on those protocols. For HLS, YouTube lists AAC, AC3, and EAC3.

Set the bitrate for your actual audio layout

  1. Check the channel layout the encoder will send. A stereo source should be sent as stereo; choose the 5.1 settings only if the feed is genuinely 5.1 surround.
  2. For stereo, configure AAC at 128 Kbps and 44.1 kHz. For 5.1 over RTMP or RTMPS, configure AAC at 384 Kbps and 48 kHz.
  3. If your ingest uses HLS, check the encoder’s codec and packaging against YouTube’s HLS requirements. HLS uses transport-stream segments of 1–4 seconds and a rolling playlist with no more than five outstanding segments.
  4. Test before the event using audio and video movement similar to the actual stream. Check the Live Control Room preview and monitor stream health. YouTube recommends keeping 20% upload-bandwidth headroom above the outgoing stream’s needs.

Why upload bitrate guidance is different

Do not substitute a video-upload recommendation for a live-ingest setting. YouTube’s upload troubleshooting guidance gives AAC-LC at 128–256 Kbps, but that concerns uploaded files, not the live feed. For stereo AAC sent to YouTube Live, its live encoder recommendation is 128 Kbps.

What the setting does—and does not—control

The bitrate you set is for the audio feed sent to YouTube. YouTube transcodes live streams into multiple output formats, so this setting does not guarantee that each viewer receives the same encoded audio stream or bitrate. It is an ingest configuration target, not a promise about every playback device or viewer connection.

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