mpv.conf: adjustments

In particular, get rid of the "vdpau" example profile, as it's pretty
useless and misleading.

etc/mpv.conf

@@ -1,5 +1,12 @@
 #
-# mpv configuration file
+# Example mpv configuration file
+#
+# Warning:
+#
+# The commented example options usually do _not_ set the default values. Call
+# mpv with --list-options to see the default values for most options. There is
+# no builtin or example mpv.conf with all the defaults.
+#
 #
 # Configuration files are read system-wide from /usr/local/etc/mpv.conf
 # and per-user from ~/.config/mpv/mpv.conf, where per-user settings override
@@ -17,18 +24,11 @@
 #
 # Profiles should be placed at the bottom of the configuration file to ensure
 # that settings wanted as defaults are not restricted to specific profiles.
-#
-# Note that the commented example options usually do _not_ set the default
-# values. Calling mpv with --list-options is a nice way to see the default
-# values for most options.
 
 ##################
 # video settings #
 ##################
 
-# Specify default video driver (see --vo=help for a list).
-#vo=opengl-hq
-
 # Start in fullscreen mode by default.
 #fs=yes
 
@@ -44,6 +44,22 @@
 # Keep the player window on top of all other windows.
 #ontop=yes
 
+# Specify default video driver (see --vo=help for a list).
+# This one selects high quality video scaling etc. - can cause problems with
+# some drivers and GPUs.
+#vo=opengl-hq
+
+# Force video to lock on the display's refresh rate, and change video and audio
+# speed to some degree to ensure synchronous playback - can cause problems
+# with some drivers and desktop environments.
+#video-sync=display-resample
+
+# Enable hardware decoding if available. Often, this does not work with all
+# video outputs, but should work well with default settings on most systems.
+# If performance or energy usage is an issue, forcing the vdpau or vaapi VOs
+# may or may not help.
+#hwdec=auto
+
 ##################
 # audio settings #
 ##################
@@ -100,9 +116,10 @@ audio-pitch-correction=no
 # If the file seems to be valid UTF-8, prefer UTF-8.
 #sub-codepage=utf8:cp1256
 
-# Enable hardware decoding if available. Often, this requires using an certain
-# video output, otherwise no hardware decoding will be used.
-#hwdec=auto
+
+# You can also include other configuration files.
+#include=/path/to/the/file/you/want/to/include
+
 
 ############
 # Profiles #
@@ -111,16 +128,8 @@ audio-pitch-correction=no
 # The options declared as part of profiles override global default settings,
 # but only take effect when the profile is active.
 
-# The following profile can be enabled on the command line with: --profile=vdpau
+# The following profile can be enabled on the command line with: --profile=invert
 
-#[vdpau]
-# The profile forces the vdpau VO.
-#vo=vdpau
-# Use hardware decoding (this might break playback of some h264 files)
-#hwdec=vdpau
-# Most video filters do not work with hardware decoding.
-#vf-clr=yes
-
-
-# You can also include other configuration files.
-#include=/path/to/the/file/you/want/to/include
+#[invert]
+# The profile forces this video filter:
+#vf-add=flip