Why do I play an AIVU 180 degree video, which has always been able to play smoothly, and then suddenly played too laggy recently? The video is embedded locally, without network factors, and the video parameters and program code have not changed at all. I also tested playing videos around 400m in size, and the CPU displayed 400-500%, but it was very smooth. When playing a video of 1G or so, the clip is 20-30%, but it is too laggy. Except for the different video duration, other parameters are the same. May I ask what caused the lag.
AIVU 180 video suddenly got too laggy
Hi @MaoChao
Thanks for the report. Two parts to this.
If the same code and the same file played smoothly on one OS build and are laggy on another, please file a Feedback Assistant report with the .aivu file, a minimal project that reproduces it, a sysdiagnose captured right after reproducing, and both build numbers: the last one where playback was smooth and the one where it is laggy. Post the Feedback number here so I can help route it to the appropriate team.
If you can't reproduce the laggy playback using the same video and code then I need more information to help you.
Is the file actually Apple Immersive Video, or is it 180 degree content? What produced the file? That will tell us which format you actually have. WWDC25 session 304 compares every profile and covers which playback modes each supports.
And how are you playing it: the system player interface in AVKit, or are you rendering the frames yourself onto a mesh? If you are using your own mesh, try the system player instead. AVKit plays both Apple Immersive Video and Apple Projected Media Profile content on visionOS 26 and handles the projection for you. Playing immersive media with AVKit is the sample, from WWDC25 session 296. If that does not work for your file, reply here and I will help.
If you are sure the file is Apple Immersive Video try the file outside your app. Apple Immersive Video Utility is our own app for importing and reviewing this content, and it runs on both Mac and Apple Vision Pro. If playback stutters there too, the problem is not in your playback code.