| tit | ter | id | |
| ffmpeg -y -i q1.mp4 -i q2.mp4 \ -filter_complex \ "[0:v][0:a][1:v][1:a] concat=n=2:v=1:a=1 [v][a]" \ -map "[v]" -map "[a]" \ -c:v libx264 -pix_fmt yuv420p -crf 23 \ -c:a aac -ar 44100 \ sum.mp4 | fil | ||
| https://en1.y2mate.is/yt-app/ | yt | ||
| shift + o; mpv | mpv |