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Yes. YouTube Live accepts H.265 (HEVC) over HLS, including playlist-based streams. It also lists HEVC for RTMP/RTMPS, so you do not need HLS just to use this codec. Choose a stream key configured for the protocol your encoder supports; for HLS, the encoder must also meet YouTube’s playlist and segment requirements.
Does YouTube Live accept HEVC over HLS, or do I need RTMP?
YouTube’s HLS setup guidance says HLS supports HEVC as well as H.264. YouTube’s general live encoder settings also list H.265 (HEVC) for RTMP/RTMPS. Either protocol can carry HEVC if your encoder supports it and is configured correctly.
The practical distinction is workflow: HLS sends a playlist of short media segments and has specific playlist requirements; RTMP/RTMPS is a continuous-stream alternative. HLS has higher latency, and YouTube says its ultra-low-latency option is unavailable for HLS. Choose the protocol your encoder supports and that fits your latency needs.
How to configure an HEVC HLS playlist stream
- Choose the protocol in Live Control Room. Create or select a stream key configured for HLS. For HDR, YouTube specifically says to leave “Turn on manual resolution” unchecked.
- Use the server URL shown in Live Control Room. YouTube’s HLS instructions specify an HTTPS URL. If you configure backup ingestion, use the backup URL provided there. Treat the stream key as a password: do not publish it or share it unnecessarily.
- Set the encoder to HEVC video and a supported audio codec. YouTube’s HLS guidance lists AAC, AC3, or EAC3 for audio.
- Meet the playlist contract. Use Transport Stream (TS) segments lasting 1–4 seconds, a rolling playlist, and no more than five outstanding segments. Do not use byte-range addressing. Send data with HTTPS POST/PUT; YouTube does not support encryption beyond HTTPS for this workflow.
- Test before the event. Send a representative test with sound and motion, check the Live Control Room preview, and monitor stream health. Confirm the encoder is producing the expected playlist and segments.
Segment length is within YouTube’s permitted range, but it also affects latency: shorter segments can reduce segment-related delay, while HLS still does not provide YouTube’s ultra-low-latency mode.
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HLS and RTMP/RTMPS compared
| Decision | HLS | RTMP/RTMPS |
|---|---|---|
| HEVC support | YouTube explicitly lists HEVC in its HLS setup guidance. | YouTube lists H.265 (HEVC) in its general RTMP/RTMPS encoder settings. |
| Configuration burden | Requires TS segments, a rolling playlist, five or fewer outstanding segments, no byte ranges, and HTTPS POST/PUT. | No HLS playlist contract; follow YouTube’s encoder settings for the selected profile. |
| Latency | Segmented delivery has higher latency; ultra-low latency is unavailable for HLS. | Use the latency options available for the selected stream. |
| HDR | Supported with HEVC and the required HDR signaling; YouTube also documents HLS output requirements. | YouTube recommends H.265 over RTMP(S) for HDR when the encoder supports the required capabilities. |
| Best next check | Verify that the encoder can produce YouTube-compliant HEVC HLS. | Verify HEVC output over RTMPS and use YouTube’s current settings for the stream profile. |
This comparison reflects YouTube’s protocol guidance, not independent testing of encoders.
HEVC bitrate and stream settings
YouTube recommends RTMPS, constant bitrate encoding, frame rates up to 60 fps, and a two-second keyframe interval (not over four seconds) in its live encoder settings. Its recommended HEVC bitrate examples are:
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| Resolution and frame rate | Recommended HEVC bitrate | Minimum HEVC bitrate |
|---|---|---|
| 1080p at 30 fps | 10 Mbps | 4 Mbps |
| 1080p at 60 fps | 12 Mbps | 4 Mbps |
| 2160p (4K) at 60 fps | 35 Mbps | 10 Mbps |
These are YouTube’s published settings, not performance guarantees. The page does not state a publication year. Use its current bitrate table for your exact codec, resolution, and frame rate rather than applying one example to another profile. YouTube also recommends upload-bandwidth headroom; its streaming tips specify 20% as recommended. Ensure the connection can sustain the encoder’s output with that margin.
What changes for HDR?
YouTube states that HDR streaming is currently supported only with H.265 (HEVC), as described in its HDR streaming guidance. The source and encoder must agree on the HDR signal: HEVC at 10 bits, BT.2020 color primaries and matrix, and either ST 2084 PQ or HLG transfer characteristics.
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YouTube documents HDR over RTMP(S) or HLS. For its hardware-encoder HLS workflow, it specifies HLS output requirements and says HDR stream keys must use HLS with manual resolution left unchecked. Encoder paths can differ, so follow the instructions for the exact device and software configuration.
YouTube names Cobalt encoders that support HEVC HDR and Telestream Lightspeed Live Stream as compatible examples. That is not a guarantee that every model in either product range supports the workflow. Check the specific model’s manual and test the configured stream before relying on it.
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Preflight checks and troubleshooting
Before going live
- Verify that the stream key is configured for the protocol you intend to use: HLS or RTMP/RTMPS.
- Confirm the exact encoder model and software version support HEVC output over that protocol.
- For HLS, inspect a test playlist for TS segments of 1–4 seconds, rolling behavior, five or fewer outstanding segments, and no byte ranges.
- For HDR, confirm the source and encoder match on 10-bit, BT.2020, and PQ or HLG signaling.
- Test with representative sound and motion, check the Live Control Room preview, and watch stream health.
- Leave upload-bandwidth headroom; YouTube’s streaming tips recommend 20%.
If the stream does not start or the preview fails
- Protocol or key mismatch: Confirm the stream key is configured for the same protocol the encoder is sending. For HLS, use the HTTPS server URL displayed in Live Control Room.
- HLS playlist is rejected or unstable: Check that segments are TS, last 1–4 seconds, roll rather than accumulating indefinitely, and that no more than five are outstanding. Remove byte-range addressing and use HTTPS POST/PUT.
- Video works but audio does not: Verify that the HLS audio codec is AAC, AC3, or EAC3 and that the encoder is actually sending an audio track.
- HDR looks wrong or is not accepted: Check that the source and encoder agree on 10-bit HEVC, BT.2020, and PQ or HLG. For the documented HDR HLS setup, confirm the stream key uses HLS and “Turn on manual resolution” is unchecked.
- Playback stalls or stream health degrades: Check available upload capacity and encoder output settings. Compare the chosen profile with YouTube’s current bitrate table and preserve the recommended bandwidth headroom.
- Delay is higher than expected: HLS is segmented and does not offer YouTube ultra-low latency. If your encoder supports it and lower latency matters, consider the RTMP/RTMPS workflow.
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