First move all videos into a single folder, then list files and redirect output into a text file. On linux, it's `ls > files.txt`, on Windows, it's `dir /B > files.txt`.
Then edit this file. This file should list videos in the order of timestamp, if not, adjust them manually. Remove any files that's not video or any videos that you don't want to be included in the final video. Put 'file ' at the beginning of every line. (In Vim, you can do this by :%s/^/file /g)
Then create a raw video by select one frame in every 30 frames from all the videos in the file:
ffmpeg -f concat -i files.txt -vf "select=not(mod(n\,30)),setpts=N/(FRAME_RATE*TB)" -vcodec rawvideo -pix_fmt yuv420p -an raw.yuvBecause this is uncompressed raw video, its size will be huge, probably tens of GigBytes. You probably don't want to play it on your computer, let alone uploaded to youtube. To make it playable, we need to compress it to mp4 format:
ffmpeg -f rawvideo -pix_fmt yuv420p -s:v 1920x1080 -i raw.yuv -vcodec libx264 video.mp4You can see an example of the time lapsed video here: