when I use VLC media player everything works, but when I use MPV, the player appears for a few seconds and then crashes (when launching SVP).
Here are the logs ([user] is my user name),
/usr/local/bin/mpv --no-config --no-quiet --terminal --no-msg-color --input-ipc-server=/tmp/smplayer-mpv-127a5 --msg-level=ffmpeg/demuxer=error --no-fs --hwdec=no --sub-auto=fuzzy --keepaspect --osd-level=1 --osd-scale=1 --osd-bar-align-y=0.6 --sub-ass --embeddedfonts --sub-ass-line-spacing=0 --sub-scale=1 --sub-font=Arial --sub-color=#ffffffff --sub-shadow-color=#ff000000 --sub-border-color=#ff000000 --sub-border-size=0.75 --sub-shadow-offset=2.5 --sub-font-size=50 --sub-bold=no --sub-italic=no --sub-margin-y=8 --sub-margin-x=20 --sub-codepage=ISO-8859-1 --vid=1 --sub-pos=100 --volume=55 --cache=auto --vf-add=lavfi=[pp=l5] --screenshot-template=cap_%F_%p_%02n --screenshot-format=jpg --screenshot-directory=/home/[user]/Images/smplayer_screenshots --audio-pitch-correction=yes --volume-max=110 --hr-seek-framedrop=no --term-playing-msg=MPV_VERSION=${=mpv-version:}
INFO_VIDEO_WIDTH=${=width}
INFO_VIDEO_HEIGHT=${=height}
INFO_VIDEO_ASPECT=${=video-params/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:}
INFO_STREAM_PATH=${stream-path}
--audio-client-name=SMPlayer --term-status-msg=STATUS: ${=time-pos} / ${=duration:${=length:0}} P: ${=pause} B: ${=paused-for-cache} I: ${=core-idle} VB: ${=video-bitrate:0} AB: ${=audio-bitrate:0} /home/[user]/Bureau/MCTrailer.mp4
(+) Video --vid=1 (*) (hevc 1280x720 2.000fps)
(+) Audio --aid=1 --alang=eng (*) (mp3 2ch 44100Hz)
AO: [pulse] 44100Hz stereo 2ch float
VO: [gpu] 1280x720 yuv420p
INFO_VIDEO_DSIZE=1280x720
MPV_VERSION=mpv 0.32.0-612-g10e11834e5
INFO_VIDEO_WIDTH=1280
INFO_VIDEO_HEIGHT=720
INFO_VIDEO_ASPECT=1.777778
INFO_VIDEO_FPS=2.000000
INFO_VIDEO_FORMAT=hevc
INFO_VIDEO_CODEC=hevc (HEVC (High Efficiency Video Coding))
INFO_AUDIO_FORMAT=mp3
INFO_AUDIO_CODEC=mp3float (MP3 (MPEG audio layer 3))
INFO_AUDIO_RATE=44100
INFO_AUDIO_NCH=2
INFO_LENGTH=59.000000
INFO_DEMUXER=lavf
INFO_SEEKABLE=yes
INFO_TITLES=
INFO_CHAPTERS=0
INFO_TRACKS_COUNT=2
METADATA_TITLE=
METADATA_ARTIST=
METADATA_ALBUM=
METADATA_GENRE=
METADATA_DATE=
METADATA_TRACK=
METADATA_COPYRIGHT=
INFO_MEDIA_TITLE=MCTrailer.mp4
INFO_STREAM_PATH=/home/[user]/Bureau/MCTrailer.mp4
INFO_TRACK_0: audio 1 'eng' '' yes
INFO_TRACK_1: video 1 'eng' '' yes
Warning: property 'video-aspect' is deprecated, refer to 'video-params/aspect' and 'video-aspect-override'.
[vapoursynth] Script evaluation failed:
[vapoursynth] Python exception: Filter SVSmoothFps returned zero or negative frame count
[vapoursynth]
[vapoursynth] Traceback (most recent call last):
[vapoursynth] File "src/cython/vapoursynth.pyx", line 1956, in vapoursynth.vpy_evaluateScript
[vapoursynth] File "src/cython/vapoursynth.pyx", line 1957, in vapoursynth.vpy_evaluateScript
[vapoursynth] File "/home/[user]/.local/share/SVP4/scripts/e5e11c3c.py", line 56, in <module>
[vapoursynth] smooth = interpolate(clip)
[vapoursynth] File "/home/[user]/.local/share/SVP4/scripts/e5e11c3c.py", line 39, in interpolate
[vapoursynth] smooth = core.svp2.SmoothFps(input_m,super["clip"],super["data"],vectors["clip"],vectors["data"],smoothfps_params,src=input_um,fps=src_fps)
[vapoursynth] File "src/cython/vapoursynth.pyx", line 1862, in vapoursynth.Function.__call__
[vapoursynth] vapoursynth.Error: Filter SVSmoothFps returned zero or negative frame count
[vapoursynth]
Core freed but 7 filter instance(s) still exist
mpv: ../video/filter/vf_vapoursynth.c:598: destroy_vs: Assertion `!p->in_node_active' failed.