[Ffmpeg-devel] [PATCH] Add moving images feature to imlib2 vhook

[Michael Niedermayer]

Hi

On Thu, Nov 02, 2006 at 11:11:33PM +0100, V?ctor Paesa wrote:
> Hi,
> >
> > I have added the posibility of moving text or images to vhook imlib2 (I
> > needed a scrolling credits generator for my home video of my son's
> > Sommerfest at school).
> >
> > I would like to submit for your review the attached patch.
> >
> 
> The original patch no longer applies, here is another version.
> 
> Regards,
> V?ctor
> Index: ffmpeg/vhook/imlib2.c
> ===================================================================
> --- ffmpeg/vhook/imlib2.c	(revision 6777)
> +++ ffmpeg/vhook/imlib2.c	(working copy)
> @@ -7,19 +7,40 @@
>   * is passed through strftime so that it is easy to imprint the date and
>   * time onto the image.
>   *
> + * You may also overlay an image (even semi-transparent) like TV stations do.
> + * You may move either the text or the image around your video to create
> + * scrolling credits, for example.
> + *
> + * Text fonts are being looked for in FONTPATH
> + *
>   * Options:
>   *
>   * -c <color>           The color of the text
>   * -F <fontname>        The font face and size
>   * -t <text>            The text
>   * -f <filename>        The filename to read text from
> - * -x <num>             X coordinate to start text
> - * -y <num>             Y coordinate to start text
> + * -x <float>           Initial X coordinate to start text or image
> + * -y <float>           Initial Y coordinate to start text or image
> + * -X <float>           Delta X movement in pixels per frame
> + * -Y <float>           Delta Y movement in pixels per frame
> + * -i <filename>        The filename to read a image from

may i suggest that you use libavcodec/eval.c for calculating the position
based on the frame number, that way a simple -x 100+5.3*n will work and
less sane things like -x 100+100*sin(n/100) will work too

[...]
> @@ -307,4 +400,3 @@
>               picture->data, picture->linesize);
>  
>  }
> -

cosmetic

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In the past you could go to a library and read, borrow or copy any book
Today you'd get arrested for mere telling someone where the library is