Shell script to convert m3u8 playlist(s) to mp4 video(s) with ffmpeg.

m3u82mp4.sh

#!/usr/bin/env bash

# Convert m3u8 playlist(s) to mp4 video(s) with ffmpeg.
#
#   Usage:
#
#       m3u82mp4.sh -i <input_url> [-i <more_input_urls>] [-d <output_dir>]
#
#   Example:
#
#       $0 -d /tmp/cat-video \
#           -i /path/to/playlist.m3u8 \
#           -i https://link.to/playlist.m3u8
#
#       Upon successful execution, the above example will generate two videos
#       in the directory "/tmp/cat-video":
#
#           1. /tmp/cat-video/%path%to%playlist.m3u8.mp4
#           2. /tmp/cat-video/https:%%link.to%playlist.m3u8.mp4
#
#   Additional information:
#
#       1. Conversion will occur in the background.  Log files, output video
#          files, process pids will be saved to a file ".m3u82mp4.summary" in
#          the working directory where the script is executed.
#       2. Existing files will not be overwritten.

set -Eeuo pipefail

declare -a input_paths
has_input=0

log_dir=~/.local/share/m3u82mp4
output_dir="$PWD"
summary_file="$PWD"/.m3u82mp4.summary

function playlist-to-mp4() {
    input_url=$1
    if [[ -e "$input_url" ]]; then
        input_url=$(realpath "$input_url")
    fi

    output_path=${input_url// /%}
    output_path=${output_path//\//%}
    output_path="$output_path".mp4
    output_path="$output_dir/$output_path"

    log_path="$input_url"
    log_path=${log_path// /%}
    log_path=${log_path//\//%}
    log_path="$log_dir/$log_path"

    ffmpeg >"$log_path" 2>&1 \
        -protocol_whitelist tcp,file,https,crypto,tls,httpproxy \
        -i "$input_url" \
        -bsf:a aac_adtstoasc -vcodec copy -c copy \
        "$output_path" -n &

    tee -a "$summary_file" <<EOF
Conversion started ..
                input: $input_url
             log file: $log_path
    output video file: $output_path
                  pid: $(lsof -Fp "$log_path" | sed 's/p//')
EOF
}

function show-help() {
    cat <<EOF
    Usage:

        $0 -i <input_url> [-i <more_input_urls>] [-d <output_dir>]

    Example:

        $0 -d /tmp/cat-video \\
            -i /path/to/playlist.m3u8 \\
            -i https://link.to/playlist.m3u8

        Upon successful execution, the above example will generate two videos
        in the directory "/tmp/cat-video":

            1. /tmp/cat-video/%path%to%playlist.m3u8.mp4
            2. /tmp/cat-video/https:%%link.to%playlist.m3u8.mp4

    Additional information:

        Conversion will occur in the background.  Log files, output video
        files, process pids will be saved to a file ".m3u82mp4.summary" in the
        working directory where the script is executed.
EOF
}

while getopts "d:i:" optvar; do
    case "$optvar" in
        d) output_dir="$OPTARG" ;;
        i)
           has_input=1
           input_paths=("${input_paths[@]}" "$OPTARG")
           ;;
        *) show-help "$@" ;;
    esac
done
shift $((OPTIND - 1))

if [[ "$has_input" == 0 ]]; then
    show-help
    builtin exit 1
fi

mkdir -p "$log_dir" "$output_dir"

for input in "${input_paths[@]}"; do
    playlist-to-mp4 "$input"
done

if [[ -f $summary_file ]]; then
    echo >&2 "stdout has been saved to $summary_file"
fi

# Author: Blurgy <[email protected]>
# Date:   Jul 10 2021, 20:47 [CST]