added ab-av1 patch

modules/encode/ab-av1_opus_no_default_bitrate.patch

@@ -0,0 +1,20 @@
+diff --git a/src/ffmpeg.rs b/src/ffmpeg.rs
+index bb2dcad..8790725 100644
+--- a/src/ffmpeg.rs
++++ b/src/ffmpeg.rs
+@@ -141,7 +141,6 @@ pub fn encode(
+         "copy"
+     });
+ 
+-    let set_ba_128k = audio_codec == "libopus" && !oargs.contains("-b:a");
+     let downmix_to_stereo = downmix_to_stereo && !oargs.contains("-ac");
+     let map = match video_only {
+         true => "0:v:0",
+@@ -165,7 +164,6 @@ pub fn encode(
+         .arg2("-c:a", audio_codec)
+         .arg_if(matroska, "-dn") // "Only audio, video, and subtitles are supported for Matroska"
+         .arg2_if(downmix_to_stereo, "-ac", 2)
+-        .arg2_if(set_ba_128k, "-b:a", "128k")
+         .arg2_if(add_faststart, "-movflags", "+faststart")
+         .arg2_if(add_cues_to_front, "-cues_to_front", "y")
+         .arg(output)

modules/encode/default.nix

@@ -0,0 +1,17 @@
+{ config, pkgs, lib, ... }:
+{
+  nixpkgs.overlays = [
+    (
+      final: prev: {
+        ab-av1 = prev.ab-av1.overrideAttrs (
+          old: {
+            patches = (old.patches or []) ++ [
+              ./ab-av1_opus_no_default_bitrate.patch
+            ];
+          }
+        );
+      }
+    )
+  ];
+}
+# vim: set et ts=2 sw=2 ai: