[FFmpeg-user] Creat mosaic without loose quality

[DopeLabs]

> 
> On Nov 23, 2017, at 4:23 50AM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 
> 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
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you may also want to check out the tile filter


tile=2x2,scale=1920x1080