u/nazmulhawk

Hi everyone,
I’m hoping someone has seen this before or can help me narrow down the cause.
Hardware
Mac: MacBook Pro (M1 Pro)
Memory: 16 GB
Display: External 5K monitor running at 60 Hz
Connection: Mac connected over 5 GHz Wi-Fi
Server
Jellyfin Server: Running on Linux Mint
Connection to router: Gigabit Ethernet
Playback: Using Infuse for macOS connected to Jellyfin
I also tested by accessing the exact same files directly over SMB, bypassing Jellyfin completely.
The issue occurs with both Jellyfin and SMB, so it doesn’t appear to be specific to Jellyfin.
The problem
I normally watch videos at 2× playback speed.
I’m experiencing what initially looked like micro-stuttering, but after paying closer attention, I realized something more unusual is happening.
Instead of simply dropping frames, the playback behaves like this:
Video is playing normally.
The video suddenly jumps slightly ahead.
The audio does NOT jump and continues playing normally.
About a second later, the video replays the section that it skipped.
Video and audio are synchronized again.
So it almost feels like Infuse lets the video get ahead of the audio, then corrects itself by replaying the skipped frames.
This repeats randomly throughout playback.
Buffering observations
One thing that makes me think this is not a network buffering issue is that Infuse appears to have a large amount of the movie already cached.
The cache indicator is usually far ahead of my current playback position when the problem happens.
I almost never see buffering or loading.
Network
Linux Mint server → Gigabit Ethernet
Router → 5 GHz Wi-Fi
MacBook Pro (M1 Pro)
Network performance appears good.
Additional testing
I have tested:
Jellyfin → Infuse
SMB share → Infuse
Both exhibit the same behavior.
Since SMB bypasses Jellyfin, I’m leaning toward this not being a Jellyfin issue.
Things I’m wondering
Is this a known limitation or bug with 2× playback in Infuse?
Could this be related to A/V synchronization when using accelerated playback?
Does anyone else see this on Apple Silicon Macs?
Could this be related to specific codecs (HEVC/H.265, HDR, Dolby Vision, TrueHD, DTS-HD, etc.)?
Has anyone experienced the video briefly running ahead and then replaying itself to resynchronize with the audio?
Any suggestions for additional diagnostics or settings to try would be greatly appreciated.
Thanks!

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