Problems playing mkv

[mail4curt]

I'm having problems playing mkv files. The video slows down like it's playing in slow motion. Any ideas how to fix it?

[rvm]

Could you send the mplayer/mpv log (menu View) after playing a mkv file?

[mail4curt]

C:/Program Files (x86)/SMPlayer/mpv/mpv.exe --no-config --no-quiet --terminal --no-msg-color --input-file=/dev/stdin --no-fs --hwdec=no --sub-auto=fuzzy --priority=normal --no-input-default-bindings --input-vo-keyboard=no --no-input-cursor --cursor-autohide=no --no-keepaspect --wid=8651604 --monitorpixelaspect=1 --osd-scale=1 --sub-ass --embeddedfonts --ass-line-spacing=0 --sub-scale=1 --sub-text-font=Arial --sub-text-color=#ffffffff --sub-text-shadow-color=#ff000000 --sub-text-border-color=#ff000000 --sub-text-border-size=0.75 --sub-text-shadow-offset=2.5 --sub-text-font-size=50 --sub-text-bold=no --sub-codepage=utf8:ISO-8859-1 --aid=1 --sub-pos=100 --volume=52 --cache=auto --osd-level=0 --screenshot-template=cap_%F_%p_%02n --screenshot-format=jpg --screenshot-directory=C:\Users\Curt\Pictures\smplayer_screenshots --audio-channels=2 --audio-pitch-correction=yes --af-add=equalizer=0:0:0:0:0:0:0:0:0:0 --term-playing-msg=MPV_VERSION=${=mpv-version:}
INFO_VIDEO_WIDTH=${=width}
INFO_VIDEO_HEIGHT=${=height}
INFO_VIDEO_ASPECT=${=video-aspect}
INFO_VIDEO_FPS=${=container-fps:${=fps}}
INFO_VIDEO_FORMAT=${=video-format}
INFO_VIDEO_CODEC=${=video-codec}
INFO_AUDIO_FORMAT=${=audio-codec-name}
INFO_AUDIO_CODEC=${=audio-codec}
INFO_AUDIO_RATE=${=audio-params/samplerate}
INFO_AUDIO_NCH=${=audio-params/channel-count}
INFO_LENGTH=${=duration:${=length}}
INFO_DEMUXER=${=current-demuxer:${=demuxer}}
INFO_SEEKABLE=${=seekable}
INFO_TITLES=${=disc-titles}
INFO_CHAPTERS=${=chapters}
INFO_TRACKS_COUNT=${=track-list/count}
METADATA_TITLE=${metadata/by-key/title:}
METADATA_ARTIST=${metadata/by-key/artist:}
METADATA_ALBUM=${metadata/by-key/album:}
METADATA_GENRE=${metadata/by-key/genre:}
METADATA_DATE=${metadata/by-key/date:}
METADATA_TRACK=${metadata/by-key/track:}
METADATA_COPYRIGHT=${metadata/by-key/copyright:}
INFO_MEDIA_TITLE=${=media-title:}
--term-status-msg=STATUS: ${=time-pos} / ${=duration:${=length:0}} P: ${=pause} B: ${=paused-for-cache} I: ${=core-idle} H:/TV/Last Man Standing/05-16 Eves Band.mkv

Playing: H:/TV/Last Man Standing/05-16 Eves Band.mkv
(+) Video --vid=1 (*) (hevc)
(+) Audio --aid=1 --alang=eng (*) 'Surround' (ac3)
Subs --sid=1 --slang=eng (ass)
AO: [wasapi] 48000Hz stereo 2ch float
VO: [opengl] 1920x1080 yuv420p
INFO_VIDEO_DSIZE=1920x1080
MPV_VERSION=mpv 0.11.0-git-f8c5743
INFO_VIDEO_WIDTH=1920
INFO_VIDEO_HEIGHT=1080
INFO_VIDEO_ASPECT=1.777778
INFO_VIDEO_FPS=23.976025
INFO_VIDEO_FORMAT=hevc
INFO_VIDEO_CODEC=HEVC (High Efficiency Video Coding) [lavc:hevc]
INFO_AUDIO_FORMAT=ac3
INFO_AUDIO_CODEC=ATSC A/52A (AC-3) [lavc:ac3]
INFO_AUDIO_RATE=48000
INFO_AUDIO_NCH=2
INFO_LENGTH=1293.107000
INFO_DEMUXER=mkv
INFO_SEEKABLE=yes
INFO_TITLES=
INFO_CHAPTERS=0
INFO_TRACKS_COUNT=3
METADATA_TITLE=
METADATA_ARTIST=
METADATA_ALBUM=
METADATA_GENRE=
METADATA_DATE=
METADATA_TRACK=
METADATA_COPYRIGHT=
INFO_MEDIA_TITLE=05-16 Eves Band.mkv
INFO_TRACK_0: video 1 '' '' yes
INFO_TRACK_1: audio 1 'eng' 'Surround' yes
INFO_TRACK_2: sub 1 'eng' '' no
Track switched:
(+) Video --vid=1 (*) (hevc)
(+) Audio --aid=1 --alang=eng (*) 'Surround' (ac3)
(+) Subs --sid=1 --slang=eng (ass)
Track switched:
(+) Video --vid=1 (*) (hevc)
(+) Audio --aid=1 --alang=eng (*) 'Surround' (ac3)
(+) Subs --sid=1 --slang=eng (ass)
INFO_VIDEO_BITRATE=0
INFO_AUDIO_BITRATE=384000
INFO_VIDEO_BITRATE=0
INFO_AUDIO_BITRATE=383999

[rvm]

There's no error or warning in the log, so I don't know what's wrong.
You can try to select a different video and/or audio output driver in preferences -> general video/audio, and see if it makes any difference.