For a typical YouTube live stream sent over RTMP or RTMPS, H.264 video with AAC audio is a practical starting point. But “format” can mean the codec, the container, or the ingest protocol—and the best combination depends on what the destination accepts, what your encoder supports, and how much latency you can tolerate.
What “video format” means for a live stream
Three separate choices are often bundled together under the word “format.” They work as a set, but one does not automatically determine the others.
- Codec: Compresses the video or audio. Common options include H.264, H.265/HEVC, AV1, and AAC.
- Container or segment format: Packages the encoded audio and video for delivery. YouTube HLS ingest, for example, requires muxed M2TS media segments.
- Ingest protocol: Carries the stream from your encoder to the platform, such as RTMP/RTMPS, HLS, or DASH.
A codec accepted over one protocol may not be accepted in another workflow. Check the destination’s current ingest requirements and your encoder’s capabilities before choosing settings.
Which video format is best for live streaming?
For a standard YouTube encoder workflow over RTMP or RTMPS, H.264 video and AAC audio are a widely practical baseline. YouTube’s encoder guidance also lists H.265/HEVC and AV1 for RTMP/RTMPS. YouTube recommends RTMPS, describing it as a secure extension to RTMP. See YouTube’s live encoder settings.
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That is not a universal answer for every platform or delivery path. YouTube’s HLS ingest has distinct packaging requirements, and its protocol comparison describes different codec support for HLS and DASH. Choose the combination that the platform and the specific ingest workflow explicitly support.
Compare the main live-streaming workflows
| Workflow | What it supports or requires | Best fit and trade-off |
|---|---|---|
| YouTube RTMP/RTMPS | YouTube lists H.264, H.265/HEVC, and AV1 video; AAC or MP3 audio; up to 60 fps; and constant bitrate (CBR). RTMPS encrypts the connection and is YouTube’s recommendation. | A practical direct-to-platform route. Use a codec supported by both your encoder and YouTube’s current guidance. |
| YouTube HLS ingest | Requires muxed M2TS, H.264 or HEVC video, single-track AAC audio, closed GOPs, and up to 60 fps. Media segments should be one to four seconds and must not exceed five seconds. | Can suit high-quality or high-resolution workflows, but segment-based delivery generally has more latency than RTMP or WebRTC. |
| YouTube DASH ingest | YouTube’s protocol comparison lists H.264 and VP9 for DASH and describes DASH as encrypted. | Consider when its codec and resolution support suit the stream and ultra-low latency is not essential. |
| Managed delivery or output | AWS MediaLive documents H.264/AAC for RTMP/RTMPS output and H.264/HEVC for HLS, among other output-group options. | Useful as a service-specific reference, not a universal rule for platforms. Confirm support for the exact service and output group. |
YouTube’s protocol comparison, last updated June 1, 2026, describes HLS and DASH as higher-latency options that can suit high-resolution or premium streams. HLS and DASH are segment-based, so they are generally not the first choice when minimizing latency is the priority. Consult YouTube’s protocol comparison and encoder settings and the relevant HLS ingest requirements for the workflow you plan to use.
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YouTube bitrate and encoder settings
The figures below are recommendations published by YouTube Help and accessed in 2026. They are platform-specific encoder settings, not general internet bandwidth requirements or a codec-quality benchmark.
| Resolution and frame rate | H.264 recommended bitrate | AV1 or H.265 recommended bitrate |
|---|---|---|
| 1080p60 | 17 Mbps | 12 Mbps |
| 1080p30 | 14 Mbps | 10 Mbps |
| 720p60 | 8 Mbps | 6 Mbps |
| 2160p60 (4K) | 50 Mbps | 35 Mbps |
YouTube’s encoder guidance also specifies these settings for its RTMP/RTMPS workflow:
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- Rate control: CBR.
- Frame rate: Up to 60 fps.
- Keyframes: Two-second intervals; do not exceed four seconds.
- Video: Square pixels, progressive scan, and Rec. 709 for SDR.
- Audio: AAC or MP3; 44.1 kHz stereo or 48 kHz 5.1. Recommended audio bitrates are 128 Kbps for stereo or 384 Kbps for 5.1.
- HDR: YouTube identifies H.265 as its HDR codec recommendation and says AV1 is not supported for HDR.
For the current figures and any changes to supported settings, use YouTube Help’s encoder settings. A listed setting only helps if your encoder, source, and connection can sustain it.
HLS ingest: packaging and segment settings
HLS differs from a basic RTMP/RTMPS encoder setup: it has a specific segment-container requirement in addition to codec requirements. YouTube’s documentation calls for muxed M2TS media segments, H.264 or HEVC video, single-track AAC audio, closed GOPs, and frame rates up to 60 fps.
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YouTube recommends segments from one to four seconds and sets a five-second maximum. Shorter segments can reduce latency, but they can also increase rebuffering and reduce encoding efficiency. Since HLS delivers media in segments, it generally has higher latency than RTMP and WebRTC. Review YouTube’s HLS ingest requirements before configuring an encoder for this path.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose a format by what matters most
- Straightforward YouTube setup: Start with H.264 video and AAC audio over RTMPS, then match the bitrate and other encoder settings to YouTube’s current guidance.
- Higher compression efficiency: Consider HEVC or AV1 only if the chosen ingest path and encoder support them. For YouTube HDR, follow the stated HEVC recommendation; AV1 is not supported for HDR.
- HLS ingest: Use the required M2TS packaging, compatible video and audio codecs, and segment lengths that meet YouTube’s limits.
- Higher resolution or premium delivery where latency is less important: Compare HLS and DASH against the platform’s protocol guidance and your required codec support.
- Very low latency: Avoid assuming a segment-based workflow will behave like a low-latency protocol; check the platform’s latency options before settling on HLS or DASH.
Compare the destination’s accepted codecs, your encoder’s support, latency, encryption, resolution and HDR requirements, bitrate, packaging, and whether the workflow sends directly to the platform or through a managed delivery service. Support listed by a cloud provider applies to its documented service and output group; it does not establish a platform-wide rule.
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Common format and ingest problems
- The platform rejects the stream: Confirm the ingest protocol, codec, audio format, and container against the destination’s requirements. A codec supported for RTMP/RTMPS may not be accepted in an HLS workflow.
- The stream buffers or drops frames: Check whether the outgoing connection can sustain the selected video and audio bitrates. YouTube’s recommendations are encoder targets, not a guarantee that a given connection can deliver them reliably.
- HLS ingest fails despite using a supported codec: Check the packaging and segment rules as well as the codec. YouTube requires muxed M2TS, single-track AAC, closed GOPs, and segments no longer than five seconds.
- Latency is higher than expected: HLS and DASH use segments and are generally higher-latency than RTMP or WebRTC. Shortening HLS segments may reduce latency, but YouTube notes the trade-off with rebuffering and encoding efficiency.
- HDR does not work as expected: Check the platform’s HDR codec guidance. YouTube identifies H.265 for HDR and does not support AV1 for HDR.
Preparing a prerecorded video for a 24/7 YouTube stream
If your goal is to keep uploaded videos playing as a live YouTube stream, the key format decision still belongs to the YouTube ingest path: configure compatible video and audio, then use the protocol and settings your streaming service supports. A prerecorded loop also needs a service or encoder to keep sending the stream; choosing a codec alone does not keep a channel live.
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