[FFmpeg-user] How to correctly chain filters

Moritz Barsnick barsnick at gmx.net
Fri Dec 7 10:20:55 EET 2018

On Fri, Dec 07, 2018 at 03:22:56 +0100, Ulf Zibis wrote:

> I have tried 2 forms:
> $ ffmpeg -i in.vob -movflags +faststart -vf bwdif -vf hqdn3d -q 3 -c:a
> copy out_bwdif_hqdn3d.vob
> $ ffmpeg -i in.vob -movflags +faststart -vf bwdif,hqdn3d -q 3 -c:a copy
> out_bwdif,hqdn3d.vob
> The 1st one results in a file of size 229 MB, the 2nd of size 328 MB.
> Can anyone tell me, what is the difference of both syntax?

ffmpeg does *not* support multiple "-vf" options for the same output,
only one of them is used. (It does not warn on multiple use either,
though.) The correct syntax for chaining filters is the comma:


    "Filters in the same linear chain are separated by commas, and
     distinct linear chains of filters are separated by semicolons."

So your second command is the one you intended.


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