Concatenation videos with different resolution. Part 2. Crop

Ok, another way, resize all videosresize all videos by smaller side ( by width or height ) and crop to output size. We will use ffmpeg filter ‘crop‘
The same 3 videos with resolution 640×480, 1920×1080 and vertical video 720×1280.

ffmpeg -y -loglevel warning
-i 5sec_640x480.mp4
-i 5sec_1920x1080.mp4
-i 5sec_720x1280.mp4
-filter_complex " 
[0:v] scale=w=max(iw*480/ih\,640):h=max(480\,ih*640/iw), setsar=1, crop=w=640:h=480 [video0]; 
[1:v] scale=w=max(iw*480/ih\,640):h=max(480\,ih*640/iw), setsar=1, crop=w=640:h=480  [video1];
[2:v] scale=w=max(iw*480/ih\,640):h=max(480\,ih*640/iw), setsar=1, crop=w=640:h=480  [video2];
[video0][video1][video2] concat=n=3:v=1 [v]" 
-map "[v]" -an -c:v h264 -crf 18 -preset veryfast -f mp4 output.mp4

The same but with concatenation audio streams too.

ffmpeg -y -loglevel warning
-i 5sec_640x480.mp4
-i 5sec_1920x1080.mp4
-i 5sec_720x1280.mp4
-filter_complex " 
[0:v] scale=w=max(iw*480/ih\,640):h=max(480\,ih*640/iw), setsar=1, crop=w=640:h=480 [video0]; 
[1:v] scale=w=max(iw*480/ih\,640):h=max(480\,ih*640/iw), setsar=1, crop=w=640:h=480  [video1];
[2:v] scale=w=max(iw*480/ih\,640):h=max(480\,ih*640/iw), setsar=1, crop=w=640:h=480  [video2];
[0:a] anull [audio0];
[1:a] anull [audio1];
[2:a] anull [audio2];
[video0][audio0][video1][audio1][video2][audio2] concat=n=3:v=1:a=1 [v][a]
" -map "[v]" -map "[a]" -c:a aac -c:v h264 -crf 18 -preset veryfast -f mp4 output.mp4

Result:

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