SwiftFin on AppleTV 4- Can't fast forward, doesn't save progress

[johanarens]

Hello, 

I'm migrating my movies streaming from DS Video (Synology) to JellyFin. 

I'm using the version 1.0.1 of SwiftFin on my AppleTV (with TVoS 18.2). 

Server is 10.10.3, running in a container on my Synology NAS. 

On the AppleTX specifically, I can't resume any video, I can't fast forward and the client doesn't reminds the progress. 

When viewing the same video, everything works as it is supposed to. 

In case you are wondering, here is the video info : 
Video
Title: 480p H264 SDR
Codec: H264
Codec tag: avc1
AVC: Yes
Profile: High
Level: 40
Resolution: 720x480
Aspect ratio: 16:9
Anamorphic: No
Interlaced: No
Framerate: 23.976025
Bitrate: 576 kbps
Bit depth: 8 bit
Video range: SDR
Video range type: SDR
Color space: smpte170m
Color transfer: bt709
Color primaries: smpte170m
Pixel format: yuv420p
Ref frames: 1
NAL: 4

Is that a known problem ? 
Is there any setting I could adjust to fix this ? 

Thanks ! 

Johan