[FFmpeg-devel] Scale, Rotate, Translate Matrix Op.

Joshua Grauman jnfo-c at grauman.com
Fri Jun 10 22:06:56 CEST 2011

I also found a diff/patch to add matrix transformations directly written 
by Daniel G. Taylor with input from some others. I was able to compile it 
fine (into ffmpeg? The patch adds the code to the Makefile and I think it 
gets linked in), but once again I can't figure out how to call it. When I 
run ffmpeg with -vf transform I get 'No such filter:transform'... Thanks 


> Thanks! This should do what I want. I'll have to figure out how to convert a 
> standard 3x3 transformation matrix to this, but should be fine. Any hints on 
> how to convert from an SRT or 3x3 matrix to these parameters would save me 
> some time figuring it out...
> However, I just downloaded the latest source from git and compiled, but I 
> can't get the perspective filter included/compiled no matter what configure 
> options I try. It isn't even listed when I run configure --list-filters even 
> though when I look at the source, it is in 
> libavfilter/libmpcodecs/vf_perspective.c as you state... Any reason why it 
> wouldn't be compiled in? When I try to use the filter with -vf 
> perspective=... I just get 'No such filter:perspective'...
> Thanks!
> Josh
>> On Fri, Jun 10, 2011 at 11:18:35AM -0700, Joshua Grauman wrote:
>>> Hello all,
>>> I've been looking for a way to do a matrix operation of Scale, Rotate,
>>> and Translate on a video (and then a crop). Each video only needs a
>>> single set of parameters (it is to correct for a slight rotational error
>>> a few degrees). Is there a video filter already written to do this? I
>>> couldn't find anything after much searching... Thanks!
>> we have a perspective correction filter
>> libavfilter/libmpcodecs/vf_perspective.c
>> Its maybe documented in mplayer/mencoder docs.
>> [...]
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