error function and for loop fix

ffmpeg/ffmpeg-batch-encode.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Help function
+### Help function ###
 
 Help()
 {
@@ -14,14 +14,36 @@ Help()
    echo "Learn more about FFmpeg's quality settings: https://trac.ffmpeg.org/wiki/Encode/H.264"
 }
 
+### Error function ###
+
+PROGNAME="$(basename $0)"
+
+error_exit()
+{
+
+# ----------------------------------------------------------------
+# Function for exit due to fatal program error
+#   Accepts 1 argument:
+#     string containing descriptive error message
+# ----------------------------------------------------------------
+
+
+  echo "${PROGNAME}: ${1:-"Unknown Error"}" 1>&2
+  exit 1
+}
+
+# Example call of the error_exit function.  Note the inclusion
+# of the LINENO environment variable.  It contains the current
+# line number.
+
 ### Script ###
 
 DIRECTORY=$1
-QUALITY_HD=22
+QUALITY_HD=23
-QUALITY_4K=24
+QUALITY_4K=22
 
-# Basic error handling
+# Check if source directory is provided
-if [ -z "$1" ]; then
+if [ -z "$1" ] || [ ! -d "$1" ]; then
     printf "ERROR: You must specify a source directory\n\n" 1>&2
     Help
     exit 1
@@ -32,17 +54,16 @@ if [ ! -d "$DIRECTORY/output" ]; then
     mkdir "$DIRECTORY/output"
 fi
 
+
 # Encode each file in the directory with different CRF setting based on resolution
-for FILE in "$DIRECTORY"/*; do
+for FILE in "$DIRECTORY"/*.*; do
     RES=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of default=noprint_wrappers=1:nokey=1 "$FILE")
     FILENAME=$(basename "$FILE")
         if [[ $RES -gt 1920 ]]; then
             ffmpeg -i "$FILE" -c:v libx264 -preset slow -tune film -crf "$QUALITY_4K" -c:a copy "$DIRECTORY"/output/"$FILENAME"
         elif [[ $RES -le 1920 ]]; then
             ffmpeg -i "$FILE" -c:v libx264 -preset slow -tune film -crf "$QUALITY_HD" -c:a copy "$DIRECTORY"/output/"$FILENAME"
-        else
-            echo "$FILENAME is not a valid filetype"
         fi
-done
+done || error_exit "$LINENO: An error has occurred."
 
 exit 0