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For a prerecorded program played into YouTube Live over RTMP or RTMPS, use AAC stereo at 128 Kbps and 44.1 kHz for a normal two-channel mix. Use AAC 5.1 at 384 Kbps and 48 kHz only for a genuine surround mix whose channel mapping and encoder support 5.1. These are YouTube’s published Live encoder recommendations, applied to prerecorded playback; YouTube does not publish a separate bitrate recommendation for prerecorded Live sources.
Recommended AAC settings for prerecorded YouTube Live
“Prerecorded” here means a finished video being played through an encoder into a YouTube Live stream. It does not mean uploading the file as an ordinary YouTube video. For Live ingestion, use the settings in the first two rows:
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| Live workflow and program | Audio codec | Channel layout | Sample rate | YouTube-recommended audio bitrate |
|---|---|---|---|---|
| RTMP/RTMPS, ordinary prerecorded program | AAC | Stereo (2.0) | 44.1 kHz | 128 Kbps |
| RTMP/RTMPS, actual surround program | AAC | 5.1 (six channels) | 48 kHz | 384 Kbps |
| HLS, actual surround program | AAC, AC3, or EAC3 | 5.1 | 48 kHz | 384 Kbps |
The settings are platform recommendations, not evidence that choosing a higher bitrate improves the delivered stream. YouTube’s Live encoder guidance gives 128 Kbps for stereo and 384 Kbps for 5.1; its 5.1 guidance specifies 48 kHz for the surround layout. YouTube’s Live encoder settings and 5.1 surround guidance are the relevant references.
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Choose stereo or 5.1 based on the actual mix
Use stereo for a standard two-channel program
For music, talk, or other content mixed for two channels, send a conventional left-and-right stereo pair. Stereo is the documented default for an ordinary program; adding channels simply because a file or project has them does not make the program a suitable 5.1 stream.
#1 Best Overall
- Pro performance with great pre-amps - Achieve a brighter recording thanks to the high performing mic pre-amps of the Scarlett 3rd Gen. A switchable Air mode will add extra clarity to your acoustic instruments when recording with your Solo 3rd Gen
- Get the perfect guitar and vocal take with - With two high-headroom instrument inputs to plug in your guitar or bass so that they shine through. Capture your voice and instruments without any unwanted clipping or distortion thanks to our Gain Halos
- Studio quality recording for your music & podcasts - Achieve pro sounding recordings with Scarlett 3rd Gen’s high-performance converters enabling you to record and mix at up to 24-bit/192kHz. Your recordings will retain all of their sonic qualities
- Low-noise for crystal clear listening - 2 low-noise balanced outputs provide clean audio playback with 3rd Gen. Hear all the nuances of your tracks or music from Spotify, Apple & Amazon Music. Plug-in headphones for private listening in high-fidelity
- Everything in the box: Includes Pro Tools Intro+, Ableton Live Lite, Cubase LE, and Hitmaker Expansion: a suite of essential effects, powerful software instruments, and easy-to-use mastering tools
Use 5.1 only when the full chain supports it
YouTube describes 5.1 as five full-bandwidth channels—front left, center, front right, surround left, and surround right—plus a low-frequency-effects channel. Preserve that assignment from the source through playback and encoding. YouTube warns that other channel configurations may convert unreliably to stereo, and its guidance does not specify a universal downmix matrix.
For 5.1 over RTMP or RTMPS, YouTube supports AAC only. HLS supports AAC, AC3, or EAC3 for 5.1. YouTube also says automatic 5.1 detection and production rely on a stream key created with manual resolution settings turned off; consult the current Live Control Room instructions for 5.1 when setting up a key. Its list of compatible encoders includes OBS and Videon EdgeCaster, among others; that is a compatibility list, not a guarantee that every configuration will work.
Rank #2
- The new generation of the songwriter's interface: Plug in your mic and guitar and let Scarlett Solo 4th Gen bring big studio sound to wherever you make music
- Studio-quality sound: With a huge 120dB dynamic range, the newest generation of Scarlett uses the same converters as Focusrite’s flagship interfaces, found in the world's biggest studios
- Find your signature sound: Scarlett 4th Gen's improved Air mode lifts vocals and guitars to the front of the mix, adding musical presence and rich harmonic drive to your recordings
- All you need to record, mix and master your music: Includes industry-leading recording software and a full collection of record-making plugins
- Everything in the box: Includes Pro Tools Intro+, Ableton Live Lite, Cubase LE, and Hitmaker Expansion: a suite of essential effects, powerful software instruments, and easy-to-use mastering tools
Do not use upload settings for a Live stream
If you are uploading a finished file as a standard YouTube video—not feeding it into Live—the audio guidance differs. YouTube recommends 48 kHz and lists 384 Kbps for stereo and 512 Kbps for 5.1 uploads. Its upload guidance lists AAC-LC, Opus, or Eclipsa Audio. Those upload figures are not the Live encoder recommendations above. See YouTube’s recommended upload encoding settings.
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|---|---|---|
| Prerecorded playback into Live | Stereo: AAC, 128 Kbps, 44.1 kHz. Actual 5.1: AAC, 384 Kbps, 48 kHz for RTMP/RTMPS. | Live encoder settings; 5.1 guidance |
| Ordinary video upload | 48 kHz; 384 Kbps stereo or 512 Kbps 5.1. | Upload encoding settings |
Preflight checklist before going live
- Confirm the workflow. Decide whether the file is being uploaded as a normal video or played through an encoder into Live. Use the corresponding recommendations above.
- Verify the source layout. Use stereo for a two-channel mix. Choose 5.1 only if the content is genuinely mixed in 5.1 and the channel assignments are correct.
- Set the encoder audio output. For ordinary stereo Live playback, set AAC, 128 Kbps, and 44.1 kHz. For supported 5.1 Live playback, set AAC, 384 Kbps, and 48 kHz.
- Check the ingestion path and key for 5.1. RTMP/RTMPS 5.1 requires AAC. Follow YouTube’s key configuration guidance for automatic 5.1 detection; the stream key’s manual resolution settings must be off for that detection and production process.
- Test a representative stream. Include the real audio and moving video, then review Live stream health before relying on the setup for an event. YouTube advises testing before going live, and its API health messages can warn about unsupported codecs, excessive audio bitrate, or unsupported channel counts. See YouTube Live stream health documentation.
Troubleshooting audio configuration problems
| Symptom or warning | What to check | Correction |
|---|---|---|
| YouTube reports an unsupported codec | Confirm the audio codec and ingestion protocol, especially for 5.1. | For RTMP/RTMPS 5.1, use AAC. Check YouTube’s current guidance for the selected protocol. |
| YouTube reports excessive audio bitrate | Compare the encoder output with the applicable Live recommendation. | Use 128 Kbps for stereo or 384 Kbps for 5.1, rather than substituting upload recommendations. |
| YouTube reports an unsupported channel count or surround converts incorrectly | Check the actual output layout and channel mapping; non-mono, non-stereo, non-5.1 configurations may convert unreliably. | Send a correctly mapped stereo pair for ordinary content, or a correctly mapped 5.1 mix when the whole path supports it. |
| 5.1 is not detected or produced as expected | Check the key’s manual resolution setting and the encoder’s protocol and channel support. | For YouTube’s automatic 5.1 detection and production, create a key with manual resolution settings turned off and test the real setup. |
| You intended a standard upload, not Live ingestion | Check whether the file is going through Live at all. | Use YouTube’s upload guidance instead: 48 kHz, with its listed stereo or 5.1 upload bitrate. |
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Quick Recap
Best Value
- The new generation of the artist's interface: Connect your mic to Scarlett's 4th Gen mic pres. Plug in your guitar. Fire up the included software. Start making your first big hit
- Studio-quality sound: With a huge 120dB dynamic range, the newest generation of Scarlett uses the same converters as Focusrite’s flagship interfaces, found in the world's biggest studios
- Never lose a great take: Scarlett 4th Gen's Auto Gain sets the perfect level for your mic or guitar, and Clip Safe prevents clipping, so you can focus on the music
- Find your signature sound: Air mode lifts vocals and guitars to the front of the mix, adding musical presence and rich harmonic drive to your recordings
- With Scarlett 4th Gen, you have all you need to record, mix and master your music: Includes industry-leading recording software and a full collection of record-making plugins
Rank #4
- Podcast, Record, Live Stream, This Portable Audio Interface Covers it All - USB sound card for Mac or PC delivers 48kHz audio resolution for pristine recording every time
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Rank #3
- PLUG IN AND HEAR SOUND IN SECONDS - USB Type-A connector with a 3.5mm stereo headphone output and a separate 3.5mm mono microphone input. No drivers, no software, no external power - the adapter is USB bus-powered and is recognized as a standard USB audio device.
- WORKS ON WINDOWS, MAC AND LINUX - Driverless on Windows 98SE/ME/2000/XP/Server 2003/Vista/7/8, Linux and Mac OSX, and compliant with the USB Audio Device Class 1.0 specification, so any system that supports class-compliant USB audio will see it. Select it as the sound output and input device after plugging it in.
- TWO JACKS, TWO JOBS - The green jack is stereo OUT for headphones or powered speakers; the pink jack is mono microphone IN for a 3.5mm mic. It does NOT support 4-pole headsets on a single combo plug, it does NOT power passive speakers, and it does NOT add surround sound - it is a stereo 2-channel adapter.
- FOR LAPTOPS AND DESKTOPS THAT NEED AN AUDIO PORT BACK - Adds a headphone and mic port to a laptop, desktop, or mini PC whose onboard jack has failed or was never there. Managed and work-issued computers can block new USB audio devices by policy - check with your IT department before ordering for a company machine.
- SABRENT SUPPORT AND WARRANTY - What is in the box: one USB audio sound adapter. Backed by a 1-year limited warranty, extended to 2 years when you register within 90 days on the manufacturer's website.
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