ffmpeg-fuji-to-mp4

#!/bin/bash

set -euo pipefail

run() {
    echo >&2 "+ $*"
    "$@"
}

vcodec=

opts=()
while [ $# -gt 0 ] && [[ $1 == -* ]]; do
    case "$1" in
        -h|--help)
            usage
            exit
            ;;
        --crf)
            opts+=(-crf "$2")
            shift
            ;;
        --preset)
            opts+=(-preset "$2")
            shift
            ;;
        -s|--size)
            opts+=(-s "$2")
            shift
            ;;
        --vcodec)
            vcodec="$2"
            shift
            ;;
        *)
            usage
            echo >&2 "Unknown option $1"
            exit 1
            ;;
    esac
    shift
done

if [ $# -lt 1 ] || [ $# -gt 2 ]; then
    cat >&2 <<EOM
usage: $(basename "$0") [OPTIONS] INPUT.MOV [OUTPUT.mp4]

Convert Fuji .mov quicktime video to .mp4 container, which makes native
playback possible on Android.

Under the hood, this will keep the video codec as-is (expected to be H264),
while encoding the audio as AAC (expected to be PCM originally).
It will also remove the timecode track, which can cause compatibility issues.

Options:

    -h,--help           Display this message
    --crf NUM           Set video quality rate factor (see -crf 22)
    -s,--size SIZE      Resize video to SIZE (e.g. 1920x1080)
    --preset PRESET     Set video encoding preset (slow/medium/fast/veryfast)
    --vcodec CODEC      Set video codec (e.g. libx264/libx265)

Examples:

Convert a whole directory, one at a time (ffmpeg messes up tty if parallel):

    parallel -j 1 $(basename "$0") -- *.MOV

Re-encode a video at more reasonable bitrate to reduce size:

    $(basename "$0") --preset veryfast DSCF1234.MOV

EOM
    exit 1
fi

input="$1"

if [ $# -ge 2 ]; then
    output="$2"
else
    output="$(dirname "$input")/${input%.???}.mp4"
fi

if [ -z "$vcodec" ]; then
    if [ "${#opts[@]}" -eq 0 ]; then
        # if no transcoding options, then copy input without transcoding
        vcodec=copy
    else
        # otherwise default to libx265
        vcodec=libx265
    fi
fi

run ffmpeg -i "$input" "${opts[@]}" -map_metadata 0 -c:v "$vcodec" -c:a aac -write_tmcd 0 -- "$output"

echo "Successfully wrote $output"