clipper

#!/usr/bin/env bash

function print_usage
{
    echo "Overlays video2 onto video1 as an inset. Optionally, user can clip portions of the overlayed video using ; and '"
    echo "Usage: clipper <path_to_video1> <path_to_video2>"
}

function has_audio
{
    if [[ "$1" != "" ]]
    then
        result=$(ffprobe -i "$1" -show_streams -select_streams a -loglevel error)
        if [[ "$result" != "" ]]
        then
            true
            return
        fi
    fi
    false
}

if [[ "$1" == "" || "$2" == "" || ! -f "$1" || ! -f "$2" ]]; then
    print_usage
else
    if has_audio "$1" && has_audio "$2"
    then
        mix_audio="; [aid1][aid2]amerge=inputs=2,pan=stereo|c0<c0+c2|c1<c1+c3[ao]"
    fi
    
    fname=$(basename "$1")
    fname=${fname%.*}
    mpv --script="./mark.lua" --lavfi-complex="[vid2]scale=iw/3:ih/3 [pip]; [vid1][pip] overlay=main_w-overlay_w-10:10 [vo]${mix_audio}" "$1" --external-file="$2"
    if [ -f endpoints.txt ]
    then
        while IFS=',' read start_ts stop_ts
        do
            ffmpeg -y -i "$1" -i "$2" -filter_complex "[0:v] trim=${start_ts}:${stop_ts}, setpts=PTS-STARTPTS, scale=iw/2:ih/2 [clip1]; [1:v] trim=${start_ts}:${stop_ts}, setpts=PTS-STARTPTS, scale=iw/2:ih/2 [clip2]; [clip1][clip2] hstack [vout]" -map "[vout]" "${fname}_${start_ts%.*}_${stop_ts%.*}.avi" </dev/null
        done<endpoints.txt
        rm endpoints.txt
    fi
fi