added file input option, broke into functions

ffmpeg/ffmpeg-batch-encode.sh

@@ -1,10 +1,20 @@
 #!/bin/bash
 
-### Help function ###
+### VARIABLES ###
+
+PROGNAME="$(basename "$0")"
+INPUT_SOURCE=$1
+QUALITY_HD=23
+QUALITY_4K=22
+FILEDIR=$(dirname "$INPUT_SOURCE")
+
+
+### FUNCTIONS###
+
+### Function: Help
 
 Help()
 {
-   # Display Help
    echo "This script uses sensible ffmpeg options to batch encode MKV files in a directory to compressed H264 MKVs."
    echo "You can change the CRF parameters in the script, defaults are 24 for HD and 22 for 4K."
    echo
@@ -14,56 +24,69 @@ Help()
    echo "Learn more about FFmpeg's quality settings: https://trac.ffmpeg.org/wiki/Encode/H.264"
 }
 
-### Error function ###
-
-PROGNAME="$(basename $0)"
+### Funtion: Error
 
 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 ###
+# Function: encode each file in the directory with different CRF setting based on resolution
 
-DIRECTORY=$1
-QUALITY_HD=23
-QUALITY_4K=22
+folder_encode () {
+    if [ ! -d "$INPUT_SOURCE/output" ]; then
+    mkdir "$INPUT_SOURCE/output"
+    fi
 
-# Check if source directory is provided
-if [ -z "$1" ] || [ ! -d "$1" ]; then
+    for FILE in "$INPUT_SOURCE"/*.*; 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
+                echo "File is 4K or higher, encoding using CRF $QUALITY_4K"
+                ffmpeg -i "$FILE" -c:v libx264 -preset slow -tune film -crf "$QUALITY_4K" -c:a copy "$INPUT_SOURCE"/output/"$FILENAME"
+            elif [[ $RES -le 1920 ]]; then
+                echo "File is HD or lower, encoding using CRF $QUALITY_HD"
+                ffmpeg -i "$FILE" -c:v libx264 -preset slow -tune film -crf "$QUALITY_HD" -c:a copy "$INPUT_SOURCE"/output/"$FILENAME"
+            fi
+    done
+}
+
+# Function: encode single file with different CRF setting based on resolution
+
+file_encode () {
+    if [ ! -d "$FILEDIR/output" ]; then
+    mkdir "$FILEDIR/output"
+    fi
+
+    FILENAME=$(basename "$INPUT_SOURCE")
+    RES=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of default=noprint_wrappers=1:nokey=1 "$INPUT_SOURCE")
+        if [[ $RES -gt 1920 ]]; then
+            ffmpeg -i "$INPUT_SOURCE" -c:v libx264 -preset slow -tune film -crf "$QUALITY_4K" -c:a copy "$FILEDIR"/output/"$FILENAME"
+        elif [[ $RES -le 1920 ]]; then
+            ffmpeg -i "$INPUT_SOURCE" -c:v libx264 -preset slow -tune film -crf "$QUALITY_HD" -c:a copy "$FILEDIR"/output/"$FILENAME"
+        fi
+}
+
+### SCRIPT ###
+
+# Check if source input is provided
+if [ -z "$1" ]; then
     printf "ERROR: You must specify a source directory\n\n" 1>&2
     Help
     exit 1
 fi
 
-# Create output folder within source directory
-if [ ! -d "$DIRECTORY/output" ]; then
-    mkdir "$DIRECTORY/output"
+# Run function based on file or folder input
+if [ -f "$1" ]; then
+    file_encode || error_exit "$LINENO: An error has occurred." 1>&2
+elif [ -d "$1" ]; then
+    folder_encode || error_exit "$LINENO: An error has occurred." 1>&2
+else
+    error_exit "$LINENO: Not a valid source" 1>&2
 fi
 
-
-# Encode each file in the directory with different CRF setting based on resolution
-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/"$FILENAME"
-        fi
-done || error_exit "$LINENO: An error has occurred."
-
 exit 0
+
+