diff --git a/shell/bash/avt/README.md b/shell/bash/avt/README.md
index 0ae6522..320f165 100644
--- a/shell/bash/avt/README.md
+++ b/shell/bash/avt/README.md
@@ -28,7 +28,7 @@
     Environment variables:
     nvid_preset: set preset (default: veryslow)
     nvid_vrate: replace -crf options
-    nvid_crf: set crf value (default: 21)
+    nvid_crf: set crf value (default: 19)
     nvid_rgb: use libx264rgb [set to enable]
     nvid_pixfmt: set pixel format (default: yuv420p)
     nvid_profile: set profile (default: high)
diff --git a/shell/bash/avt/avt b/shell/bash/avt/avt
index 48131d6..372123d 100755
--- a/shell/bash/avt/avt
+++ b/shell/bash/avt/avt
@@ -39,7 +39,7 @@ nvid_crf: set crf value (default: 19)
 nvid_rgb: use libx264rgb [set to enable]
 nvid_pixfmt: set pixel format (default: yuv420p)
 nvid_profile: set profile (default: high)
-nvid_ac: set audio codec (default: aac)
+nvid_ac: set audio codec (default: libopus)
 nvid_ba: set audio bitrate (default: 160k)
 nvid_ar: set audio samplerate (default: 48000)
 EOF
@@ -106,7 +106,7 @@ normalize() {
 		${nvid_cl+-init_hw_device opencl=ocl -filter_hw_device ocl} \
 		-c:v libx264${nvid_rgb+rgb} ${avt_cl+-x264opts opencl} -preset "${nvid_preset:-veryslow}" ${nvid_vrate:--crf "${nvid_crf:-19}"} \
 		-pix_fmt "${nvid_pixfmt:-yuv420p}" -profile:v "${nvid_profile:-high}" \
-		-c:a "${nvid_ac:-aac}" -b:a "${nvid_ba:-160k}" -ar "${nvid_ar:-48000}" \
+		-c:a "${nvid_ac:-libopus}" -b:a "${nvid_ba:-160k}" -ar "${nvid_ar:-48000}" \
 		-map 0 \
 		"$OUTPUTFILE"
 	return $?