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From: Nicolas George <nicolas$george@salle-s.org>
Subject: Re: =?iso-8859-1?Q?=5Bffmpeg=5D_concat=E9ner_deux=3F=0A_vid=E9os_mp4?=
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Lulu , dans le message
<slrnt26fl8.1bl3.lulu042@valentino.Rock-n-Roll.org>, a écrit :
> Est-ce que 'ffmpeg -i some.mp4 -qscale 0 some.mkv' va réencoder sans
> perte ?

Non.

Ce que tu veux, c'est ne pas réencoder, donc -c copy. Et tant qu'à faire,
fais du Matroska dès ta première copie.