Merging video files with different size, set aspect according to majority of files?

[slrslr]

Hello, on Linux i am using v. 3.23.8
and i had around 7 .avi mpeg4 video files that i have merged (using LosslessCut)
the first one 854x480
second, third, and i expect rest of files are 576x432

result is that it set the proportions/aspect according to first file i think. Because rest of the video had wrong aspect (impression of a shrinked width)

i think better would be if the program sets proportions to fit the majority of files or ideally keep the aspect for all adding black bars to smaller videos. If this can be easy to do and good idea, maybe consider implement. Thank You

[LuxKiller65]

Hi, I am having the same problem. If you want to merge 2 files of different fps/resolution, the output file always follows the 1st file.

So if you merge file1 + file2, the output follows file1. But if you merge file2 + file1, the output follows file2. An option to choose which file to follow would be really amazing and, I think, easy to implement.

Thanks!

[mifi]

Actually I'm not even sure how to do this with ffmpeg. I know how to allow the user to manually set these parameters for the output, but I don't know how to specify to ffmpeg which file to take the parameters in a concat