I'm looking to batch-convert a directory (or several) of video files from .avi to .mp4 containers, just copying the video and audio streams across. I know the ffmpeg command to do this, and have no trouble doing the files individually.
I am unfamiliar with ash (as opposed to bash) and its file-handling and looping procedures, which is making it tough to write a shell script. (It has to run in ash 'cos it's running on an underpowered Synology NAS.)
You should be fine if you stick to the Bourne shell syntax, the most import of this for your application should be the for loop.
#/bin/ash for filename in *.avi do ffmeg parameters "$filename" done I use two scripts for this it uses handbreak to do the conversion, but could be modified to user ffmpeg (but remember ffmpeg is depricated).
I run process.sh and it finds then loops through, running encode.sh for each file.
process.sh
if [ "$1" != "" ]; then dir="$1" else dir="/Data/Movies" fi if [ -e /tmp/process.lock ] ; then echo "Process already running" else echo `date` > /tmp/process.lock find "$dir" \( -mmin +10 -name "*.avi" -o -name "*.mkv" -o -name "*.mpg" \) -exec echo "{}" \; > /tmp/list cat /tmp/list | wc -l read -p "Pausing...." find "$dir" \( -mmin +10 -name "*.avi" -o -name "*.mkv" -o -name "*.mpg" \) -exec /home/coteyr/encode.sh "{}" \; rm /tmp/process.lock fi And encode.sh
#!/bin/bash echo "$1" > /tmp/current_encode.txt nice -n 19 HandBrakeCLI -T -Z Normal -i "$1" -o "$1.m4v" > /tmp/progress.log mv "$1" /Data/Temp/ echo "Idle" > /tmp/current_encode.txt echo "Idle" > /tmp/progress.log 
bash, but that it can runffmeg