Moritz Barsnick <barsnick <at> gmx.net> writes:

> But, as Cley pointed out, that file doesn't have a 
> proper extension or a proper header, so "-f concat" 
> should be added as an input option.

This is neither extension- nor header-related:
The concat demuxer has immanent security issues and 
is therefore never auto-detected, you have to 
force it with -f concat to use it.

Carl Eugen

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