How YouTube Uses AV1 and How to Check Video Playback
Understand AV1 on YouTube, check the codec used during playback, and learn what playback statistics can and cannot tell you.
YouTube uses AV1 as one of its video codecs: formats that compress video for delivery and decode it for viewing. A video being available on YouTube does not mean your device is playing an AV1 version. To check a particular playback session, look at the video codec reported in the player’s statistics.
What AV1 means for YouTube playback
AV1 is designed to compress video efficiently, helping deliver visual quality with less data than older compression methods under comparable conditions. That does not establish a fixed bandwidth saving or guarantee that every AV1 stream will look better than every stream using another codec. Resolution, encoding choices and the original video also matter.
The codec used for playback can depend on the versions available for that video and what the playback environment supports. Browser support, device capabilities and playback preferences can affect the result. Selecting a higher resolution alone does not prove that AV1 is in use.
Check the codec used during playback
In YouTube’s desktop web player, open a video and start playback. Right-click inside the video and look for Stats for nerds. Open that panel and find the Codecs entry. Menu availability and access can differ between browsers, apps and devices.
- 1. Read the video codec identifier in the Codecs entry.
- 2. An identifier beginning with av01 indicates AV1 video.
- 3. An identifier beginning with vp09 indicates VP9 video; avc1 indicates AVC, also called H.264.
- 4. Check the entry again after changing videos or playback settings, because the result describes the current playback session.
The entry can include both video and audio codec information. An audio identifier does not tell you whether the video uses AV1. Look specifically for the video identifier.
What the result establishes
Seeing av01 establishes that the player reports AV1 for the current video stream. It does not establish that your device is decoding it with dedicated hardware, that AV1 is available for every video, or that playback will remain smooth.
Hardware decoding uses dedicated circuitry to process video; software decoding uses the device’s general processing resources. The codec name alone does not distinguish them. If your concern is battery use, heat or processor load, identifying AV1 is only one part of the investigation.
If AV1 is absent or playback stutters
A different codec is not, by itself, a playback fault. If the video plays correctly, there may be nothing to change. If you are specifically investigating AV1, record the browser or app, device, selected resolution and reported codec before comparing another playback environment.
For stuttering, check whether the picture actually pauses or skips and whether the player reports dropped frames increasing during playback. Dropped frames are frames that were not displayed; they do not identify the cause on their own. Buffering, decoding limits and other device activity require separate investigation.
No device details, playback statistics or supporting product documentation were supplied for this guide. Consequently, it cannot confirm AV1 availability, current settings options, hardware decoding support or a performance improvement for your particular setup.