[FFmpeg-user] Creat mosaic without loose quality

[Carl Eugen Hoyos]

2017-11-23 12:52 GMT+01:00 Marco De Angelis <marcod71-at-yahoo.com at ffmpeg.org>:

> C:\S7\ffmpeg\bin\ffmpeg -i C:\S7\FTP_video\1.mp4 -i C:\S7\FTP_video\2.mp4
> -i C:\S7\FTP_video\3.mp4 -i C:\S7\FTP_video\4.mp4

> -filter_complex "nullsrc=size=1920x1080

This is your original source, the other videos are overlayed on top of it.
You can specify a frame-rate for the original source, in your case either
nullsrc=s=hd1080:r=60 or nullsrc=s=hd1080:r=60001/1001, your
input videos have different frame rates afaict.

It may be easier to use the vstack and hstack filters instead of
overlay.

Please do not top-post here, Carl Eugen