diff --git a/functions/av1encode.fish b/functions/av1encode.fish
new file mode 100644
index 0000000..3278764
--- /dev/null
+++ b/functions/av1encode.fish
@@ -0,0 +1,24 @@
+function av1encode
+    if test (count $argv) -lt 1
+        echo "Usage: av1encode <input-file> [crf] [preset]"
+        return 1
+    end
+
+    set input $argv[1]
+    set crf (or $argv[2] 28)
+    set preset (or $argv[3] 6)
+
+    set base (basename $input)
+    set name (string replace -r '\.[^.]+$' '' $base)
+    set output "$name.av1.mkv"
+
+    echo "Encoding: $input -> $output (CRF $crf, preset $preset)..."
+
+    ffmpeg -i "$input" \
+        -map 0 \
+        -c:v libsvtav1 -crf $crf -preset $preset \
+        -c:a libopus \
+        -c:s copy \
+        -movflags +faststart \
+        "$output"
+end