Well that file does not play with smplayer. I do not get it. Here is the full log.
Used output gpu and vpdau-copy as suggested.
/usr/bin/mpv --no-quiet --terminal --no-msg-color --input-ipc-server=/tmp/smplayer-mpv-ba5 --msg-level=ffmpeg/demuxer=error --video-rotate=no --no-config --no-fs --hwdec=vdpau-copy --sub-auto=fuzzy --vo=gpu, --framedrop=decoder+vo --no-input-default-bindings --input-vo-keyboard=no --no-input-cursor --cursor-autohide=no --no-keepaspect --wid=106954772 --monitorpixelaspect=1 --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 --sub-forced-only --sub-pos=100 --volume=84 --cache=auto --screenshot-template=cap_%F_%p_%02n --screenshot-format=jpg --screenshot-directory=/home/marco/Bilder/smplayer_screenshots --audio-pitch-correction=yes --volume-max=200 --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_DEMUX_ROTATION=${=track-list/0/demux-rotation}
INFO_AUDIO_FORMAT=${=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} /mnt/6TB/Big_Buck_Bunny_4K.mp4.crdownload
(+) Video --vid=1 (*) (h264 854x480 60.000fps)
(+) Audio --aid=1 (*) (aac 2ch 48000Hz)
File tags:
Comment: license:https://creativecommons.org/licenses/by-nd/4.0/
Title: Big Buck Bunny 4K - https://archive.org/details/big-buck-bunny-4k
[vo/gpu/x11] X11 error: BadDrawable (invalid Pixmap or Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 6600014, serial: 19
[vo/gpu/x11] Error code: 9, request code: e, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 6600014, serial: 1a
[vo/gpu/x11] Error code: 3, request code: 28, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 6600014, serial: 2c
[vo/gpu/x11] Error code: 3, request code: 2, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 6600014, serial: 2e
[vo/gpu/x11] Error code: 3, request code: 1, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 9400002, serial: 31
[vo/gpu/x11] Error code: 3, request code: 12, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 9400002, serial: 34
[vo/gpu/x11] Error code: 3, request code: 94, minor code: 3
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 9400002, serial: 36
[vo/gpu/x11] Error code: 3, request code: 12, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 9400002, serial: 37
[vo/gpu/x11] Error code: 3, request code: 12, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 9400002, serial: 39
[vo/gpu/x11] Error code: 3, request code: 12, minor code: 0
[vo/gpu/x11] X11 error: BadWindow (invalid Window parameter)
[vo/gpu/x11] Type: 0, display: 0x7f8f2c003e60, resourceid: 9400002, serial: 3a
[vo/gpu/x11] Error code: 3, request code: 12, minor code: 0
[vo/gpu/opengl] Could not create EGL surface!
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 10 (X_UnmapWindow)
Resource id in failed request: 0x9400002
Serial number of failed request: 63
Current serial number in output stream: 67
