[webkit-help] rendering a webkit output into a video file
benjamin at webkit.org
Wed Apr 16 15:41:31 PDT 2014
On 4/16/14, 8:19 AM, Tommy Chheng wrote:
> I'm working on a system to render an HTML5 animation to a video file.
> So far, we have been able to use phantomjs to output image files at
> time intervals and combine them together with ffmpeg.
> This solution mostly works but phantomjs doesn't include features like
> video tag support or webgl.
> It looks like webkitgtk+ includes a full stack rendering with video
> tag(via gstreamer) and webgl support.
> Where can i start investigating in the code how to use webkitgtk+ to
> snapshot a rendering of a web page at time intervals?
> Because we want this to run as an automated process on a headless
> linux system, screencasting tools are out of the question.
> Also, to give an analogy, if we have an animation system written in
> OpenGL, we can easily capture image frames to video
> using glReadPixels. We want the equivalent "glReadPixels" for webkitgtk.
> I noticed some mention of a webkitvideosink from
> http://gstreamer.freedesktop.org/conference/slides/webkit.pdf but not
> much details of how it works.
In theory that is possible, the software could flatten the output layer
tree at each frame and get the pixels back. I don't know what kind of
support exists for GTK+.
I suggest you to ask this question on the webkit-gtk mailing list.
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