[FFmpeg-user] Best way for converting HD 1080i to DVCPRO25 DV?

Iban Garcia ibantxo28 at gmail.com
Fri Jun 22 09:46:06 CEST 2012

Thanks Frederik,

I have been using lanczos in almost all downconversions but, there are some
artifacts (high frequencies...) in SD copy...
I think... Should I scale in some other way (not default way)?

Many Thanks

2012/6/21 Frederik Dam Sunne <frederiksunne at gmail.com>

> >
> > The problem is the scaling (downscaling)... My question is about the
> > quality for transcoding from HD1080i to SD DVCPRO25. Is this (without
> > any filtering) the best way to process these contents to SD?
> Well maybe give lanczos a try:
> -sws_flags lanczos
> and or experiment with a subtle unsharpen effect to compensate a bit for
> the blur introduced from downscaling and interpolation:
> http://ffmpeg.org/libavfilter.html#unsharp
> Frederik
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