[FFmpeg-user] concat, "Too many invisible frames"

[Emanuel Berg]

o/

I try to concat two webm files and get

  Too many invisible frames

The files have different resolutions, is that why it fails?
If so, how do you then "normalize" them before concat'ing?

If it isn't that, then why?

I used the

  ffmpeg -y -f concat -safe 0 -i $file_list -c copy $dst

command.

TIA

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