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.
Benjamin
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