Hi Ayose On Mon, Aug 18, 2025 at 07:22:56AM +0100, Ayose via ffmpeg-devel wrote: > This is a proposal to add a new filter to FFmpeg: drawvg, to draw > vector graphics on top of a video, using libcairo. > > This is my first contribution to FFmpeg, so I don't know if this is > the right channel to make the proposal. > > I was thinking on how to write it, and I thought that a FAQ-like > summary may be the easiest way to describe it. Apologies if this is > more confusing than helpful. > > > == What is drawvg == > > drawvg is a filter to render vector graphics on top of video frames. > > The render is done by executing a script written in its own language, > called VGS (Vector Graphics Script). The script consists of a series > of commands to describe 2D graphics, which are rasterized using the > libcairo library. > > VGS is not intended to be used as a general-purpose language. Since > its scope is limited, it prioritizes being concise and easy to use. > The syntax is heavily inspired by languages like [1]Magick Vector > Graphics, or [2]SVG's <path>. > > [1] https://imagemagick.org/script/magick-vector-graphics.php > [2] > https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Element/path > > Some features of the syntax (like using whitespaces to separate > arguments) are also present in languages like TCL or shell scripts. > Many command names are taken from PostScript. > > Scripts can use FFmpeg expressions to describe graphics dynamically, > so they can compute coordinates based on frame dimensions, frame > metadata, generate random values, read pixel colors, etc. > > For example, to draw a blue circle in the middle of a frame: > > circle (w / 2) (h / 2) 100 > setcolor blue > fill > > Then: > > $ ffplay -i example.webm -vf 'drawvg=file=blue-circle.vgs' > > There is a [3]website with some examples on how to integrate drawvg > with other FFmpeg filters, and also a [4]playground to experiment with > the capabilities of the language. > > [3] https://ayosec.github.io/ffmpeg-drawvg/ > [4] https://ayosec.github.io/ffmpeg-drawvg/playground/
i like the filter, i think its useful and cool thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB The bravest are surely those who have the clearest vision of what is before them, glory and danger alike, and yet notwithstanding go out to meet it. -- Thucydides
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