Batch transcode mp4 files from a directory, set bitrate, and output to another directory.

transcode_media_ffmpeg.sh

#!/bin/sh
#
# Batch transcode mp4 files from a directory, 
# set bitrate, and output to another directory.

# User-defined parameters
INPUT_DIR="/home/user/Videos/pre"
OUTPUT_DIR="/home/user/Videos/post"
MEDIA_EXTENSION="mp4"
TARGET_BITRATE_VIDEO="8M"
TARGET_BITRATE_AUDIO="128K"

# Execution
echo "Started down transcode script"
echo "Looking for $MEDIA_EXTENSION files within $INPUT_DIR"

for filePath in `find $INPUT_DIR | grep ".$MEDIA_EXTENSION"`; do 
  fileName=basename "${filePath}"
  echo "Transcoding $fileName..."
  ffmpeg -i $filePath -vcodec libx264 -b:v $TARGET_BITRATE_VIDEO -acodec aac -b:a $TARGET_BITRATE_AUDIO $OUTPUT_DIR/$fileName
done

echo "completed!"