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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11AV1 is a video codec: a way to compress video for delivery, not a streaming platform, resolution, or automatic quality upgrade. Its efficient compression can help a live stream look better at a given bitrate or use fewer bits for similar quality—but AV1 can require more computing power, and it only works when the encoder, streaming software, platform, and playback path support it.
What is the AV1 codec?
AV1 stands for AOMedia Video 1. It is an open video codec with a published bitstream and decoding specification, designed to provide efficient compression for video delivery, including high-resolution and adaptive streaming. The Alliance for Open Media describes AV1 as aiming for high-quality compression with greater efficiency than previous codecs. That is the format’s design goal; results in a particular stream depend on the content and encoding choices. Alliance for Open Media: AV1 Video Codec
A codec compresses video into data that can be stored or sent across a network. AV1 is distinct from the container or delivery protocol around the video: for example, YouTube documents AV1 as an ingest video codec for streams sent over RTMP or RTMPS.
How does AV1 affect live-stream quality and bitrate?
Compression efficiency gives a broadcaster two possible benefits: keep roughly similar visual quality while sending fewer bits, or use the same bitrate to target better visual quality. The actual outcome varies with the footage, resolution, frame rate, encoder implementation, and settings. Fast motion, fine detail, and other demanding content can affect the result, so a codec label alone does not predict quality.
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AV1’s potential efficiency has a compute cost. Meta’s 2025 technical overview describes AV1 as capable of superior quality at the same bitrate or equivalent quality at a reduced bitrate, while noting its increased computational complexity. For live video, encoding must keep pace with the source in real time; a system that cannot do so may not be practical even if its compression is attractive. Meta Engineering’s 2025 AV1 overview
The Alliance for Open Media page cites “30% better compression” from Bitmovin’s “Multi-Codec DASH Dataset: An Evaluation of AV1, AVC, HEVC, and VP9.” Meta’s 2025 overview phrases a comparison as “up to 30% better compression than VP9.” These are attributed comparative claims, not a promise that an individual live stream will use 30% less bandwidth; the AOMedia page does not state a year for the Bitmovin result. Alliance for Open Media: AV1 Features
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Does YouTube accept AV1 for live streaming?
Yes. YouTube’s published live-encoder guidance lists AV1, H.264, and H.265 (HEVC) as video codec options for RTMP/RTMPS ingest. Its recommendations are specific to YouTube and can change, so check the live settings page before configuring a broadcast. YouTube Help: Choose live encoder settings, bitrates, and resolutions
YouTube bitrate recommendations
The figures below are YouTube’s recommended ingest bitrates, not universal codec requirements or a guarantee of a particular picture quality.
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| YouTube stream format | AV1 or H.265 recommended bitrate | H.264 recommended bitrate |
|---|---|---|
| 1080p at 60 fps | 12 Mbps | 17 Mbps |
| 2160p (4K) at 60 fps | 35 Mbps | 50 Mbps |
Use the target that matches the resolution and frame rate you actually send, and make sure your sustained upload capacity can carry the stream with room for network variation. A nominal connection speed is not the same as stable upload throughput.
Other YouTube encoder settings
- Rate control: YouTube recommends constant bitrate (CBR).
- Frame rate: YouTube’s guidance allows up to 60 fps.
- Keyframes: Set a two-second keyframe interval; YouTube says not to exceed four seconds.
- Protocol and codec: The documented AV1 ingest option is for RTMP/RTMPS. Confirm that your encoder and streaming software can output AV1 over the protocol you select.
HDR limitation on YouTube
YouTube’s documented RTMP(S) settings say AV1 is not supported for HDR and recommend H.265 for HDR. This is a YouTube ingest limitation in that guidance, not a statement that the AV1 specification cannot represent HDR. If HDR is required, use the platform’s current recommendation rather than choosing AV1 for its compression efficiency.
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Will viewers receive AV1 if I send AV1?
Not necessarily. YouTube says it automatically transcodes live streams into output formats for viewers across devices and networks. The codec used for your ingest can therefore differ from the format delivered to an individual viewer; sending AV1 does not mean every viewer decodes AV1. YouTube’s live encoder guidance
The end-to-end path matters: your encoder must create AV1 in a supported configuration, the software and protocol must carry it correctly, the service must accept it, and the delivery system must produce compatible playback options. Viewer decoding capacity and platform transcoding also affect deployment and delivery trade-offs. Meta’s overview discusses these compute and decoding considerations at scale. Meta Engineering’s 2025 AV1 overview
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AV1, H.264, or H.265: how to choose
| Decision factor | What to check |
|---|---|
| Quality at your bitrate | Compare the same footage, resolution, frame rate, and target quality. Compression results depend on both content and encoder settings. |
| Upload capacity | Compare the target platform’s recommended ingest bitrate with your stable, sustained upload capacity. YouTube’s figures above are platform-specific recommendations. |
| Encoding capacity | Check whether your software and hardware can encode AV1 in real time at the intended resolution and frame rate. Efficiency can come with increased computational complexity. |
| Platform and software support | Verify the destination’s current ingest documentation and that your encoder can send the chosen codec through the required protocol. YouTube documents AV1 for RTMP/RTMPS. |
| HDR | For YouTube’s documented RTMP(S) setup, choose H.265 rather than AV1 when HDR is required. |
| Playback and delivery | Consider decoding support and whether the platform transcodes the incoming stream into viewer formats. An AV1 ingest does not establish that every viewer receives AV1. |
AV1 is worth considering when the entire workflow supports it and its compression or bitrate trade-off matters to your broadcast. H.264 may be the more appropriate option when it better fits the encoder and platform workflow; H.265 is YouTube’s stated choice for HDR in the documented RTMP(S) setup. No codec is automatically best without those constraints.
What hardware and software do you need to encode AV1 live?
AV1 hardware encoding exists, but support depends on the specific hardware, software implementation, required protocol, and intended resolution and frame rate. A graphics card with AV1 encoding may be relevant for a local setup; do not assume that any card marketed with AV1 decoding can also encode AV1. Check the exact card’s encoder capabilities and verify that your streaming software exposes them for the format and settings you plan to use.
For managed encoding or transcoding, the Alliance for Open Media lists AWS Elemental, Ateme, and Bitmovin among AV1-supporting services. That category-level listing does not establish that every service, product tier, or configuration supports your particular live workflow. Alliance for Open Media: Products and services
Troubleshooting an AV1 live stream
- The platform rejects the stream: Confirm that the destination accepts AV1 for the selected ingest protocol and that your software is actually sending AV1. For YouTube, the documented option is AV1 over RTMP/RTMPS.
- The encoder cannot keep up: Real-time AV1 encoding can demand substantial compute. Check encoder load and real-time performance, then reduce processing demands or use an encoder and hardware combination that supports the target settings.
- The stream buffers or drops frames: Compare the configured bitrate with the platform’s guidance and your stable upload capacity. Check network stability as well as the encoder; bitrate efficiency does not compensate for an unstable connection.
- Keyframe or bitrate settings are flagged: For YouTube, use CBR and a two-second keyframe interval, staying within its stated maximum of four seconds.
- HDR does not work with AV1 on YouTube: YouTube’s cited RTMP(S) guidance does not support AV1 for HDR; use H.265 as it recommends.
- Some viewers have playback problems: Ingest and viewer playback are separate. YouTube transcodes for different devices and networks, so check the platform’s output and viewer playback rather than assuming the incoming codec is delivered unchanged.
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