[Libav-user] Could not find codec parameters

[Carl Eugen Hoyos]

Emanuel Berg <embe8573 at ...> writes:

> avconv -i concat:file_1.mp3\|...\|file_n.mp3 -c copy out.mp3

This mailing list is related to the FFmpeg project.
avconv contains several hundred known, user-reported 
bugs that are not reproducible with FFmpeg, please 
understand that we cannot support it.

I suspect you cannot generally concatenate mp3 
files like this (it may work in some cases though), 
please test the concat demuxer:
https://ffmpeg.org/ffmpeg-formats.html#concat-1

Carl Eugen