#!/bin/sh
cd ../out
find *.mp4 | sed 's:\ :\ :g'| sed 's/^/file /' > list.txt
ffmpeg -f concat -safe 0 -segment_time_metadata 1 -i list.txt -vf select=concatdec_select -af aselect=concatdec_select,aresample=async=1 final.mp4