update docs

.github/RELEASE/subs2srs.conf

@@ -139,8 +139,9 @@ reload_config_before_card_creation=yes
 ##
 
 # Snapshot format.
-# Do not switch to `jpg` unless your computer doesn't support `webp`.
-snapshot_format=webp
+# Do not switch to `jpg` unless your computer doesn't support `webp` or `avif`.
+snapshot_format=avif
+#snapshot_format=webp
 #snapshot_format=jpg
 
 # Quality of produced image files. 0 = lowest, 100=highest.

README.md

@@ -193,7 +193,8 @@ Alternatively, we have a collection of user-created note types, which you can br
 
 If you are having problems playing media files on older mobile devices,
 set `audio_format` to `mp3` and/or `snapshot_format` to `jpg`.
-Otherwise, I recommend sticking with `opus` and `webp`,
+Otherwise, I recommend sticking with `opus` for audio,
+and `avif` or `webp` for images,
 as they greatly reduce the size of the generated files.
 
 If you still use AnkiMobile (the [proprietary](https://www.gnu.org/proprietary/) Anki app),

subs2srs.lua

@@ -56,7 +56,7 @@ local config = {
     secondary_sub_visibility = 'auto', -- One of: 'auto', 'never', 'always'. Controls secondary_sid visibility. Ctrl+V to cycle.
 
     -- Snapshots
-    snapshot_format = "webp", -- webp or jpg
+    snapshot_format = "avif", -- avif, webp or jpg
     snapshot_quality = 15, -- from 0=lowest to 100=highest
     snapshot_width = -2, -- a positive integer or -2 for auto
     snapshot_height = 200, -- same