[FFmpeg-user] How to correctly chain filters

[Ulf Zibis]

Hi,

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?

Regards,

Ulf