[FFmpeg-user] Off topic - but still raises a Question about video formats

jd1008 jd1008 at gmail.com
Thu Oct 15 04:33:13 CEST 2015

Using youtube-dl to download videos from youtube,
I am sometimes getting this message:

WARNING: Requested formats are incompatible for merge and will be merged 
into mkv.

Could someone please explain the reason behind this?

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