Problem with stuttering playback on a MKV file

[bigcookie 12]

Dear Community,

I do have issues with a movie (Doctor Strange) being played back stuttering. The issue: The system starts playback (takes a while) but every few seconds (2-3s) the playbacks stops for a short time (I guess 0,5-1s), which I would like not to happen. Any recommendation is highly appreciated. I do run Emby 4.8.10 on a QNAP TS-653B with Intel x64 J3455 CPU. Hardware acceleration is activated for transcoding (in settings just "enabled"). Attached the Transcode log of this specific file and the Emby server log which includes that timeframe as well.

Any help is highly appreciated. Thanks in advance!!!!

 

 

embyserver.txt ffmpeg-transcode-a4e8416c-2c0b-45da-8a13-9bf46a0e1280_1.txt

[Neminem 1518]

Guess you hardware is too weak to play that file.
Speed marked in red should be over 1.

15:17:21.299 elapsed=00:00:00.68 frame=    6 fps=0.0 q=-0.0 size=N/A time=00:00:00.12 bitrate=N/A throttle=off speed=0.181x    
15:17:21.811 elapsed=00:00:01.19 frame=   12 fps= 10 q=-0.0 size=N/A time=00:00:00.38 bitrate=N/A throttle=off speed=0.317x    
15:17:22.387 elapsed=00:00:01.77 frame=   19 fps= 11 q=-0.0 size=N/A time=00:00:00.70 bitrate=N/A throttle=off speed=0.395x    
15:17:22.896 elapsed=00:00:02.28 frame=   25 fps= 11 q=-0.0 size=N/A time=00:00:00.92 bitrate=N/A throttle=off speed=0.405x    
15:17:23.468 elapsed=00:00:02.85 frame=   32 fps= 11 q=-0.0 size=N/A time=00:00:01.21 bitrate=N/A throttle=off speed=0.425x    
15:17:24.045 elapsed=00:00:03.43 frame=   39 fps= 11 q=-0.0 size=N/A time=00:00:01.53 bitrate=N/A throttle=off speed=0.446x    
15:17:24.622 elapsed=00:00:04.01 frame=   46 fps= 11 q=-0.0 size=N/A time=00:00:01.78 bitrate=N/A throttle=off speed=0.446x    
15:17:25.146 elapsed=00:00:04.53 frame=   52 fps= 11 q=-0.0 size=N/A time=00:00:02.04 bitrate=N/A throttle=off speed=0.451x    
15:17:25.732 elapsed=00:00:05.12 frame=   59 fps= 12 q=-0.0 size=N/A time=00:00:02.36 bitrate=N/A throttle=off speed=0.462x    
15:17:26.298 elapsed=00:00:05.68 frame=   66 fps= 12 q=-0.0 size=N/A time=00:00:02.65 bitrate=N/A throttle=off speed=0.466x    
15:17:26.884 elapsed=00:00:06.27 frame=   73 fps= 12 q=-0.0 size=N/A time=00:00:02.94 bitrate=N/A throttle=off speed=0.469x    

[visproduction 315]

FYI: CPU review: https://www.cpubenchmark.net/cpu.php?cpu=Intel+Celeron+J3455+%40+1.50GHz

 

[bigcookie 12]

Makes sense. I will then reencode… Will check the link. Best settings recommendation would be great, but will check the other files I have before trial and error :-). I thought HW acceleration would work well enough on this one :/(.

 

many thanks!

[Neminem 1518]

You used your subtitles "hdmv_pgs_subtitle" those are really heavy on you CPU.

But you can try without using subs.

Or get .srt subs

[bigcookie 12]

Good tip - will do this over the weekend! Is there any page or guideline, which type of subtitles or encodings are pretty CPU heavy? I'd like to learn more

[Neminem 1518]

I general all picture based subs are heavy.

So with your server I would stay with text based subs like srt.

Subtitles - Wikipedia 

All Subtitle Formats: Which to Use & Why

Subtitles - VideoLAN Wiki

[bigcookie 12]

Thanks again - reading the sources you shared! I took the easy way: I generated the SRT subtitles and left the MKV as it is (just need to remember to turn off the PGS subs)...

[Neminem 1518]

Ok that means you are all good now

[bigcookie 12]

Yes, I should have written this clearly :-). Thanks again!!!