[FFmpeg-user] Zoom effect

Paulo Barretto pmbarretto at gmail.com
Fri Jun 6 19:41:43 CEST 2014

Thank you for the answers.

I've read about melt and I've seen it can use ffmpeg for decode and encode,
will look closer at it.

I didn't have time yet, but will look at gmane patch also.

I've been using Avisynth for editing and ffmpeg for encoding for some time.
But there are few formats Avisynth can read, and cameras use different
codecs even among different models of same brand. So I used ffmpeg to
output video uncompressed to an avi file (not longer than a few minutes),
then edit and frameserve into ffmpeg for encoding. Recently I started to
use ffmpeg filters instead, and found out that they could do almost
everything I was doing with Avisynth, often better.
Zoom effect can be done with some careful coding in Avisynth using only
core filters, while rotating demands an external plugin. That encouraged me
to ask for a zoom capable filter, since ffmpeg does time-variable rotation
so nicely.

2014-06-05 19:36 GMT-03:00 Carl Eugen Hoyos <cehoyos at ag.or.at>:

> Paulo Barretto <pmbarretto <at> gmail.com> writes:
> > I mean a filter with time-dependent width and height
> > parameters, that would scale each frame and keep the
> > output cropped and padded to constant dimensions.
> You could test this patch:
> http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/170504
> Carl Eugen
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