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-vf scale=960:-2: -vf/-af/-filter and -filter_complex cannot be used together for the same stream. Is there any way to get what I want to do in one step (concat & scale down)? Else, would that means concating with demuxer is the only pre-prepare option now? Thx-vf,-af,-filter, or-filter_complex.[0:0] [0:1] [1:0] [1:1] [2:0] [2:1], but moving onto theconcat=n=...part I'm not sure there. Also, the wiki have more space, while yours have some extra;. Neither of them matters right? THX!ffmpeg -i input1 -i input2 -i input3