iOS/iPadOS Stuttering on 4k AV1 movie

[alsahhim 0]

Recently started converting some of my movies to AV1 codec and I'm running into an issue on my iOS/iPadOS devices where there is stuttering in the video when direct playing on both my M4 iPad Pro and my iPhone 17 Pro, both of which are capable of direct playing av1 content.  I can play these files with Infuse with no issues and they also play fine on android TV.  The video is showing no playback errors, but it is constantly stuttering.

[Luke 42077]

 

Hi there, let's look at an example. Please attach the information requested in how to report a media playback issue. Thanks!

 

[alsahhim 0]

Hello, please see the attached logs.  I attempted playback again via my ipad right before pulling the log.  The app shows direct play for everything but I am still getting constant stuttering.

embyserver.txt

[Luke 42077]

Hi, does your device support av1?

[alsahhim 0]

Yes it is the M4 iPad Pro and the new iPhone 17 pro, both of which have hardware av1 decoders.  The videos play fine in infuse on both devices but I greatly prefer using the Emby app.

[Luke 42077]

OK so this is an mkv? As a test, if you convert to np4, then I bet it plays better right?

[alsahhim 0]

Converting it to MP4 does allow the video to play but it no longer triggers DV and instead falls back to HDR10.  The MKV will trigger dolby vision but of course is continuously choppy

[Luke 42077]

On 12/6/2025 at 11:32 AM, alsahhim said:

Converting it to MP4 does allow the video to play but it no longer triggers DV and instead falls back to HDR10.  The MKV will trigger dolby vision but of course is continuously choppy

When you converted, did you copy the original video stream or did it get reencoded?

[alsahhim 0]

It did not, I just used ffmpeg to move it over to mp4. Only took about a minute so it definitely didn’t reencode