Update 2025-04-12_09:56:11

normalize.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# Check for ffmpeg dependency
+if ! command -v ffmpeg &> /dev/null; then
+    echo "ffmpeg could not be found. Please install ffmpeg to use this script."
+    exit 1
+fi
+
+# Number of concurrent ffmpeg processes
+N=${1:-8}
+
+# Semaphore file for limiting concurrent processes
+semaphore=/tmp/ffmpeg.lock
+
+# Opening the semaphore file descriptor on 9
+exec 9>"$semaphore"
+
+# Function to run an ffmpeg command with semaphore locking
+run_ffmpeg() {
+  # Wait for a semaphore slot to become available
+  flock -x 9
+
+  # Execute the ffmpeg command
+  ffmpeg -y -i "$1" -af "loudnorm=I=-16:LRA=11:measured_I=-20:measured_LRA=16,volume=0.8" "$2"
+  if [ $? -ne 0 ]; then
+    echo "An error occurred with ffmpeg processing $1"
+    # Release the semaphore slot on error as well
+    flock -u 9
+    return 1
+  fi
+
+  # Release the semaphore slot
+  flock -u 9
+}
+
+# Create the semaphore file if it does not exist
+touch "$semaphore"
+if [ ! -f "$semaphore" ]; then
+    echo "Failed to create semaphore file."
+    exit 1
+fi
+
+# Processing each .opus file
+find . -maxdepth 1 -type f -name '*.m4a' | while read -r file; do
+  wav_file="${file/%.m4a/.wav}"
+  if [ ! -f "$wav_file" ]; then
+    echo "Processing $file..."
+    run_ffmpeg "$file" "$wav_file" &
+
+    # Ensure N parallel ffmpeg processes
+    while [ $(jobs -p | wc -l) -ge "$N" ]; do
+      wait -n
+    done
+  fi
+done
+
+# Wait for all background jobs to finish
+wait
+
+# Close the semaphore file descriptor and remove the file
+exec 9>&-
+rm -f "$semaphore"
+