Many changes

scripts/shell/ffmpeg-join-videos.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+# Usage example:
+#   ./ffmpeg-join-videos.sh -i vid1.mp4 vid2.mp4 vid3.mp4 -o output_name
+
+# Exit on error
+set -e
+
+# Parse arguments
+videos=()
+output_filename=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+  -i | --input-list)
+    shift
+    # Collect all filenames until another option appears or args end
+    while [[ $# -gt 0 && "$1" != -* ]]; do
+      videos+=("$1")
+      shift
+    done
+    ;;
+  -o | --output-filename)
+    output_filename="$2"
+    shift 2
+    ;;
+  -h | --help)
+    echo "Usage: $0 -i file1 file2 [file3 ...] -o output_name"
+    exit 0
+    ;;
+  *)
+    echo "Unknown option: $1"
+    exit 1
+    ;;
+  esac
+done
+
+# Validate args
+if [[ ${#videos[@]} -lt 2 ]]; then
+  echo "Error: You must provide at least two input files with -i"
+  exit 1
+fi
+
+if [[ -z "$output_filename" ]]; then
+  echo "Error: You must provide an output filename with -o"
+  exit 1
+fi
+
+# Number of videos
+n=${#videos[@]}
+
+# Build input args for ffmpeg
+inputs=()
+for vid in "${videos[@]}"; do
+  inputs+=("-i" "$vid")
+done
+
+# Build the concat filter
+filter=""
+for i in "${!videos[@]}"; do
+  filter+="[$i:v] [$i:a] "
+done
+
+filter_complex="${filter}concat=n=$n:v=1:a=1 [v] [a]"
+
+# Run ffmpeg
+ffmpeg "${inputs[@]}" -filter_complex "$filter_complex" -map "[v]" -map "[a]" "${output_filename}.mp4"