4k videos have to buffer every few seconds for hardwired TCL Roku TV; Using Emby Premiere

[jonmagee 1]

We're having major buffering issues when it comes to any 4k content through emby on our TV.  Things I've tried are changing the Quality on the roku TV app from Auto, to 4k - 60 Mbps and 4k - 30Mbps but this has made no difference.  Videos take around 10-15 seconds to start playing, and then require buffering every 10-15 seconds.  Below is the details of our setup, and I've attached the logs that I know to. 


Emby Server version: 4.9.0.48-724090048
Synology model:DS220+
Synology version: DSM 7.2.2-72806 Update 3
TV model: 65S421
Network: Hardwired Cat6, gigabit switch

ffmpeg-transcode-6226216d-03af-4efe-aa89-642f6716c615_1.txt embyserver.txt

[Neminem 1518]

I think your GeminiLake UHD Graphics 600 - AV1 can't handle AV1 and falls back to CPU transcoding.

[av1_qsv @ 0x198d640] Error initializing the MFX video decoder: unsupported (-3)

elapsed=00:07:56.50 frame= 3546 fps=7.4 q=28.0 size=N/A time=00:02:21.52 bitrate=N/A throttle=off speed=0.297x    
07:42:31.636 elapsed=00:07:57.12 frame= 3551 fps=7.4 q=28.0 size=N/A time=00:02:21.71 bitrate=N/A throttle=off speed=0.297x    
07:42:32.249 elapsed=00:07:57.73 frame= 3555 fps=7.4 q=28.0 size=N/A time=00:02:21.88 bitrate=N/A throttle=off speed=0.297x    
07:42:32.774 elapsed=00:07:58.26 frame= 3559 fps=7.4 q=28.0 size=N/A time=00:02:22.03 bitrate=N/A throttle=off speed=0.297x    
07:42:33.429 elapsed=00:07:58.91 frame= 3564 fps=7.4 q=28.0 size=N/A time=00:02:22.25 bitrate=N/A throttle=off speed=0.297x    
07:42:34.042 elapsed=00:07:59.53 frame= 3568 fps=7.4 q=28.0 size=N/A time=00:02:22.40 bitrate=N/A throttle=off speed=0.297x    
07:42:34.696 elapsed=00:08:00.18 frame= 3572 fps=7.4 q=28.0 size=N/A time=00:02:22.57 bitrate=N/A throttle=off speed=0.297x    
07:42:35.325 elapsed=00:08:00.81 frame= 3576 fps=7.4 q=28.0 size=N/A time=00:02:22.72 bitrate=N/A throttle=off speed=0.297x    
07:42:35.855 elapsed=00:08:01.34 frame= 3580 fps=7.4 q=28.0 size=N/A time=00:02:22.89 bitrate=N/A throttle=off speed=0.297x    
07:42:36.357 elapsed=00:08:01.84 frame= 3583 fps=7.4 q=29.0 size=N/A time=00:02:23.01 bitrate=N/A throttle=off speed=0.297x    
07:42:36.893 elapsed=00:08:02.38 frame= 3585 fps=7.4 q=28.0 size=N/A time=00:02:23.08 bitrate=N/A throttle=off speed=0.297x    

And your CPU is not fast enough, speed should be over 1x

Does you Roku support AV1 video format ?

Edited August 1, 2025 by Neminem

[Luke 42077]

@jonmagee?

[jonmagee 1]

Sorry for just now responding; that was the issue!  I can get the videos in vp9 or avc and they work great.

[Luke 42077]

Thanks for following up.