cat[171823Z APR 21][palmer@trinity] palmer $ cat !$
cat ~/bin/mp4-to-mkv.sh
#!/usr/bin/env bash

set -e

if termux-battery-low; then
    echo "Battery is too low to encode files"
    exit 1
fi

for x in *.mp4; do
    NAME=$(basename "$x" .mp4);
    MKV="$NAME.mkv";

    if [ -f "$MKV" ]; then
        continue;
    fi

    ffmpeg -i "$x" -map 0 -c copy -c:a ac3 "$MKV"
done