[FFmpeg-user] Codec requirements for using concat protocol

[Jonathan Viney]

Hi everyone,

I'm concatenating short video files of the same codec together using the
concat protocol (MPEG-TS/H.264).

When the docs (https://trac.ffmpeg.org/wiki/Concatenate) say "If you have
media files with the same codec and codec parameters you can concatenate
them as described ..." - which parameters is it referring to? Resolution,
profile, level, bitrate, keyframe intervals?

I'm mainly concerned with web playback of the concatenated videos. Are
there some general rules that should ensure reasonable compatibility.

I was surprised to find that Chrome was happy to playback a concatenated
video even when the resolution changed between the inputs!

Cheers,
-Jonathan.