fix screenshot

- higher compression level
- unique filenames for each screenshot

.config/mpv/mpv.conf

@@ -13,9 +13,13 @@ ass-left-margin=50
 ass-right-margin=50
 
 
+# screenshot
+screenshot-template="%f_%p"
+screenshot-compression=1..10
+screenshot-compression-level=10
 screenshot-format=png
 screenshot-high-bit-depth=yes
-screenshot-png-compression=7 # this requires a lot of cpu
+screenshot-png-compression=10 # this requires a lot of cpu
 screenshot-directory=/mnt/Data/mpv-screenshots/
 
 input-cursor=no
@@ -112,3 +116,4 @@ sub-border-color="#000000"
 sub-align-y=24
 sub-ass-force-style=FontName='Calex Code JP',FontSize=48,Outline=0.5,PrimaryColour=&Hffffff&,SecondaryColour=&H000000&,OutlineColour=&H000000&,BackColour=&H000000&,Alignment=2
 
+