4k playback small stutter on i5 7th gen

[jmfjohn]

I have an Intel nuc7i5bnh with the 7th gen i5 cpu. I bought it specifically to use as a 4k HTPC (mkv files) after reading in various places it should decode them flawlessly.

The thing is it...almost does. The CPU stays at around 40-50% and the GPU around 20% and generally the movie plays, but there is a very small stutter every half a second or so. It's especially obvious in scenes of continuous motion, for example I was watching Interstellar when the ship spins and you can clearly notice the stutter in the spinning. On the other hand 1080p content works perfectly. Interstellar is Video : x265 3840x2160 (23.976 fps) @ 24.5 Mb/s (CRF 17).

Any idea what could cause it?
- CPU and GPU don't seem to be under load (RAM I guess doesn't matter, but it's used about 3gb out of 8gb)
- I played the file over wifi (5ghz) and from an external HDD connected on USB, same
- I tried VLC 32 and 64bit
- I checked some suggested internet solutions like file cache (was already set to 300ms)
- drivers are all up to date

[Hitchhiker]

See the illustrated post by unidan in this thread on how to post log files which are essential for troubleshooting. .

[jmfjohn]

Code: Select all

main debug: toggling pause main debug: toggling pause mmdevice debug: state changed: 1 main warning: playback too early (-41015): down-sampling main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: resampling stopped (drift: -2400 us) main debug: auto hiding mouse cursor main debug: VoutDisplayEvent 'mouse button' 0 t=8 main debug: VoutDisplayEvent 'mouse button' 0 t=9 main debug: VoutDisplayEvent 'mouse button' 0 t=8 main debug: VoutDisplayEvent 'mouse button' 0 t=9 main debug: auto hiding mouse cursor main debug: VoutDisplayEvent 'mouse button' 0 t=8 main debug: VoutDisplayEvent 'mouse button' 0 t=9 main debug: VoutDisplayEvent 'double click' qt debug: Qt: Fullscreen state changed main debug: VoutDisplayEvent 'fullscreen' 1 qt debug: Qt: Entering Fullscreen main debug: resized to 3840x2160 main debug: VoutDisplayEvent 'resize' 3840x2160 main debug: VoutDisplayEvent 'resize' 3840x2160 direct3d11 debug: Detected size change 3840x2160 main warning: picture is too late to be displayed (missing 47 ms) main debug: picture might be displayed late (missing 5 ms) main warning: picture is too late to be displayed (missing 174 ms) main warning: picture is too late to be displayed (missing 132 ms) main warning: picture is too late to be displayed (missing 90 ms) main warning: picture is too late to be displayed (missing 49 ms) main debug: picture might be displayed late (missing 7 ms) main warning: picture is too late to be displayed (missing 82 ms) main warning: picture is too late to be displayed (missing 41 ms) main debug: picture might be displayed late (missing 10 ms) main debug: picture might be displayed late (missing 2 ms) main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: VoutDisplayEvent 'mouse button' 0 t=8 main debug: VoutDisplayEvent 'mouse button' 0 t=9 main debug: VoutDisplayEvent 'double click' qt debug: Qt: Fullscreen state changed qt debug: Qt: Quitting Fullscreen main debug: VoutDisplayEvent 'fullscreen' 0 main debug: resized to 3840x2118 main debug: VoutDisplayEvent 'resize' 3840x2118 main debug: resized to 3840x2050 main debug: VoutDisplayEvent 'resize' 3840x2050 main debug: resized to 3840x2014 main debug: VoutDisplayEvent 'resize' 3840x2014 main debug: VoutDisplayEvent 'resize' 3840x2014 direct3d11 debug: Detected size change 3580x2014 main debug: resized to 3814x1944 main debug: VoutDisplayEvent 'resize' 3814x1944 main debug: VoutDisplayEvent 'resize' 3814x1944 direct3d11 debug: Detected size change 3456x1944 main debug: resized to 3840x1890 main debug: VoutDisplayEvent 'resize' 3840x1890 main debug: VoutDisplayEvent 'resize' 3840x1890 direct3d11 debug: Detected size change 3360x1890 main warning: picture is too late to be displayed (missing 141 ms) main warning: picture is too late to be displayed (missing 99 ms) main warning: picture is too late to be displayed (missing 58 ms) main debug: picture might be displayed late (missing 18 ms) main warning: picture is too late to be displayed (missing 300 ms) main warning: picture is too late to be displayed (missing 259 ms) main warning: picture is too late to be displayed (missing 219 ms) main warning: picture is too late to be displayed (missing 177 ms) main warning: picture is too late to be displayed (missing 135 ms) main warning: picture is too late to be displayed (missing 94 ms) main warning: picture is too late to be displayed (missing 54 ms) main debug: picture might be displayed late (missing 12 ms) main debug: resized to 3814x1944 main debug: VoutDisplayEvent 'resize' 3814x1944 main debug: VoutDisplayEvent 'resize' 3814x1944 direct3d11 debug: Detected size change 3456x1944 main warning: picture is too late to be displayed (missing 125 ms) main warning: picture is too late to be displayed (missing 83 ms) main warning: picture is too late to be displayed (missing 42 ms) main debug: picture might be displayed late (missing 0 ms) main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: VoutDisplayEvent 'mouse button' 0 t=8 main debug: VoutDisplayEvent 'mouse button' 0 t=9 main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: auto hiding mouse cursor main debug: resized to 3812x1944 main debug: VoutDisplayEvent 'resize' 3812x1944 main debug: VoutDisplayEvent 'resize' 3812x1944 main debug: resized to 3612x1842 main debug: VoutDisplayEvent 'resize' 3612x1842 main debug: VoutDisplayEvent 'resize' 3612x1842 direct3d11 debug: Detected size change 3274x1842 main debug: resized to 3398x1696 main debug: VoutDisplayEvent 'resize' 3398x1696 main debug: VoutDisplayEvent 'resize' 3398x1696 direct3d11 debug: Detected size change 3015x1696 main warning: picture is too late to be displayed (missing 72 ms) main warning: picture is too late to be displayed (missing 30 ms) main debug: resized to 3168x1540 main debug: VoutDisplayEvent 'resize' 3168x1540 main debug: VoutDisplayEvent 'resize' 3168x1540 direct3d11 debug: Detected size change 2737x1540 main debug: resized to 3154x1534 main debug: VoutDisplayEvent 'resize' 3154x1534 main debug: VoutDisplayEvent 'resize' 3154x1534 direct3d11 debug: Detected size change 2727x1534 main warning: picture is too late to be displayed (missing 82 ms) main warning: picture is too late to be displayed (missing 40 ms) main debug: picture might be displayed late (missing 1 ms) main debug: auto hiding mouse cursor main debug: incoming request - stopping current input main debug: killing decoder fourcc `hevc' main debug: removing module "avcodec" main debug: saving a free vout main debug: reusing provided vout main debug: discarded audio buffer mmdevice debug: state changed: 0 wasapi debug: reset main debug: killing decoder fourcc `dts ' main debug: removing module "avcodec" wasapi debug: reset main debug: removing module "samplerate" main debug: removing module "audio_format" main debug: removing module "scaletempo" main debug: removing module "simple_channel_mixer" main debug: removing module "float_mixer" main debug: keeping audio output main debug: removing module "dts" main debug: removing module "mkv" main debug: Program doesn't contain anymore ES mkv debug: Stopping the UI Hook main debug: removing module "record" main debug: removing module "cache_read" main debug: removing module "filesystem" main debug: dead input main debug: nothing to play main debug: destroying useless vout main debug: removing module "direct3d11" direct3d11 debug: Direct3D11 resources destroyed qt debug: IM: Deleting the input direct3d11 debug: Direct3D11 device adapter closed direct3d11 error: SetThumbNailClip failed: 0x800706f4 direct3d11 debug: Win32 Vout EventThread terminating direct3d11 debug: Win32VoutCloseWindow direct3d11 debug: WinProc WM_DESTROY main debug: removing module "inhibit" qt debug: releasing video... qt debug: Video is not needed anymore main debug: removing module "freetype" main debug: removing module "yuvp" main debug: removing module "swscale"

[Lotesdelere]

As requested, we need the full resulting log, from the very beginning to the very end.

[robUx4]

The stutter with 4K files can be resolved by forcing ffmpeg to use 1 thread (in advanced properties). The CPU at 40% seems a bad sign that hardware acceleration is not used though.

[jmfjohn]

Sure, I can provide the full log, just wondering what you mean by "the full log" I followed the instructions in that thread and:
1. Opened VLC
2. Scrolled to a section of the movie where it was clearly stuttering
3. Set verbosity to verbose
4. Started playback, left it running for a while
5. Stopped playback and posted the log

Does the full log mean i need to set verbosity to verbose before starting playback?

[unidan]

> Does the full log mean i need to set verbosity to verbose before starting playback?

Yes please