Videos mearging for youtube uploading with chapters

shell_20210527_videos_merging.md

Merge videos for youtube uploading

Calculate duration of videos then export to file

for mp4 in *.mp4
do
    l=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$mp4")
    echo $l ${mp4%.*}
done | awk '
        NR == 1{
                prev = $1;
                $1 = "00:00";
                print;
        }
        NR > 1{
                sum += prev;
                prev = $1;

                h = int(sum / 3600);
        m = int((sum - (h*3600)) / 60);
            s = int(sprintf("%.0f", sum - (h*3600) - (m*60)));

                if(s < 10)
                        s = sprintf("0%s", s);

                if(m < 10)
                        m = sprintf("0%s", m);

                if(h > 0)
                        $1 = sprintf("%s:%s:%s", h, m, s);
                else
                        $1 = sprintf("%s:%s", m, s);

                print;
        }
        BEGIN{
                printf("Chapters:\n")
                printf("-----------------------------------------------------------------------------------\n");
        }

Merging

ffmpeg -f concat -safe 0 -i <(printf "file '$PWD/%s'\n" ./*.mp4) -c copy output.mp4