diff --git a/net/server/transform/transform_vhd.sh b/net/server/transform/transform_vhd.sh
index d6556cb3..53d1ff63 100755
--- a/net/server/transform/transform_vhd.sh
+++ b/net/server/transform/transform_vhd.sh
@@ -1,2 +1,2 @@
 #!/bin/bash
-ffmpeg -i $1 -y -f mp4 -map_metadata -1 -vf scale=720:-2 -c:v libx264 -crf 23 -preset veryfast -c:a aac $2
+ffmpeg -i $1 -y -f mp4 -map_metadata -1 -vf scale=720:-2 -c:v libx264 -crf 23 -preset veryfast -c:a mp3 $2
diff --git a/net/server/transform/transform_vlq.sh b/net/server/transform/transform_vlq.sh
index f342731e..1da3f58a 100755
--- a/net/server/transform/transform_vlq.sh
+++ b/net/server/transform/transform_vlq.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
-ffmpeg -i $1 -y -f mp4 -map_metadata -1 -vf scale=320:-2 -c:v libx264 -crf 32 -preset veryfast -c:a aac $2
+ffmpeg -i $1 -y -f mp4 -map_metadata -1 -vf scale=320:-2 -c:v libx264 -crf 32 -preset veryfast -c:a mp3 $2
 
diff --git a/net/server/transform/transform_vsd.sh b/net/server/transform/transform_vsd.sh
index 1cfd2cea..acce7c00 100755
--- a/net/server/transform/transform_vsd.sh
+++ b/net/server/transform/transform_vsd.sh
@@ -1,2 +1,2 @@
 #!/bin/bash
-ffmpeg -i $1 -y -f mp4 -map_metadata -1 -vf scale=640:-2 -vcodec libx265 -crf 32 -preset veryfast -tag:v hvc1 -acodec aac $2
+ffmpeg -i $1 -y -f mp4 -map_metadata -1 -vf scale=640:-2 -vcodec libx265 -crf 32 -preset veryfast -tag:v hvc1 -acodec mp3 $2