Combine 4:3 and 16:9 MKVs that have same resolution

[FlammableD]

Hi all,

I'm trying to combine two MKVs ripped from a DVD. One is in a 4:3 type aspect ratio, and the other is in 16:9, so I wanted to add black bars to the 4:3 video and then combine it using MKVToolnix.

However, I can't figure out how to do this and have the file resolution line up. My initial attempt was to run

ffmpeg -i STEEN_DISC1.mkv -filter:v "pad=ih*16/9:ih:(ow-iw)/2:(oh-ih)/2" -c:a copy STEEN_DISC1.169.mkv

, this however told me "The width of the two tracks is different: 720 and 852".

It turns out that both files have the same resolution, but different display resolutions, from the info tool:

File 1:
Pixel width: 720
Pixel height: 480
Display width: 640
Display height: 480

File 2:
Pixel width: 720
Pixel height: 480
Display width: 853
Display height: 480

How can I add black bars to file 1 in a way that will allow me to combine it with file 2?

Thanks!

[ProWo]

You can mux both into a ts container and concat then the two ts chunks.

[ProWo]

File 1
resize from 720x480 to 538x480, pad 91 to left and right, flag as 16:9

[FlammableD]

Hey, thanks for the nudge in the right direction!

The command that worked for me in the end was:

ffmpeg -i STEEN_DISC1.mkv -map 0 -filter:v "scale=538:480,pad=720:ih:(ow-iw)/2:(oh-ih)/2" -c:a copy -c:v mpeg2video -qscale:v 0 STEEN_DISC1.169.mkv