[FFmpeg-devel] [PATCH] libavfilter-soc: Make the overlay filter able to align to opposite edges
Wed May 6 15:34:02 CEST 2009
Martin Storsj? wrote:
> On Wed, 6 May 2009, Michael Niedermayer wrote:
>> On Wed, May 06, 2009 at 02:47:16PM +0300, Martin Storsj? wrote:
>>> The attached patch makes the overlay filter able to align the overlaid
>>> stream to the opposite edges, by setting negative offsets. E.g.,
>>> overlay=-1:-1 sets the overlay at one pixel from the bottom right corner.
>> i would have thought negtaive offsets would cause a overlay to hang out
>> at the left/top aka be cliped.
> That would probably be more logical, yes. That's not supported in the
> overlay filter at the moment, though, but could of course be fixed later
> (or before adding this kind of functionality).
> Any suggestions on a better way of achieving this in the overlay filter's
> parameter interface?
I think you'd have to add extra parameters to toggle the operation of
the offsets and maintain logical functionality as Michael claimed. Maybe
have right and bottom parameters that, when non-zero, toggle to make the
offsets be calculated from the right/bottom.
More information about the ffmpeg-devel