andfree
This command did also the job on the first laptop (the one with the old OpenGL). But the quality of playing video this way is not better than that by using vlc. I have also installed liblavfile-2.1-0. Now, the terminal output is:
$ mpv --sub-codepage=cp1253 Stranger-Than-Paradise-1984.mp4
Playing: Stranger-Than-Paradise-1984.mp4
[lavf] Using subtitle charset: cp1253
(+) Video --vid=1 (*) (h264)
(+) Audio --aid=1 --alang=eng (*) (aac)
(+) Subs --sid=1 'Stranger-Than-Paradise-1984.srt' (subrip) (external)
libEGL warning: did not find extension DRI_IMAGE version 1
[vo/opengl] Suspected software renderer or indirect context.
[vo/opengl] At least OpenGL 2.1 or OpenGL ES 2.0 required.
Failed to open VDPAU backend libvdpau_nouveau_vieux.so: cannot open shared object file: No such file or directory
[vo/vdpau] Error when calling vdp_device_create_x11: 1
[vo/xv] Warning: this legacy VO has bad quality and performance, and will in particular result in blurry OSD and subtitles. You should fix your graphics drivers, or not force the xv VO.
[lavf] Edit lists are not correctly supported (FFmpeg issue).
AO: [alsa] 48000Hz stereo 2ch float
VO: [xv] 1280x720 yuv420p
AV: 00:00:00 / 01:29:03 (0%) A-V: 0.000 Dropped: 2
[vo/xv] X11 can't keep up! Waiting for XShm completion events...
AV: 00:09:09 / 01:29:03 (10%) A-V: 0.480 Dropped: 8
Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).antiX utilities for processing PDF files (posted by ChPol)