diff --git a/dotfiles/local/bin/convert-libaom.sh b/dotfiles/local/bin/convert-libaom.sh
index 3208dde..a8b0c4a 100755
--- a/dotfiles/local/bin/convert-libaom.sh
+++ b/dotfiles/local/bin/convert-libaom.sh
@@ -11,6 +11,7 @@
 #   - https://trac.ffmpeg.org/wiki/Encode/AV1
 #
 # Changes:
+# 2024-01-21: minor improvement to handling of output file name
 # 2022-06-13: use _max_crf in mkvpropedit if we don't find an acceptable vmaf
 # 2022-04-05: update VMAF log parsing
 # 2021-10-21: I tested 2-pass and found it doesn't do anything for constant
@@ -53,15 +54,16 @@ elif [[ ! -r "$1" ]]; then
     exit 1
 fi
 
-INPUT_FILE_BASENAME=$(basename "$1")
+INPUT_FILE_BASENAME=$(basename -- "$1")
 INPUT_FILE_EXTENSION=${INPUT_FILE_BASENAME##*.}
-INPUT_FILE_DIRNAME=$(dirname "$1")
+INPUT_FILE_DIRNAME=$(dirname -- "$1")
 
 # Check if an output file name was specified (like if we are calling from the
 # benchmarking script, in which case we want to exit as soon as possible). If
 # not then we can continue with a simple filename based on the input file's.
 if [[ -z $_output_file ]]; then
-    _output_file="${INPUT_FILE_BASENAME/.*/}.webm";
+    # Strip file extension from end of string and replace with webm
+    _output_file="${INPUT_FILE_BASENAME%$INPUT_FILE_EXTENSION}webm";
     _benchmark_mode="false"
 else
     _benchmark_mode="true"