Question

After playing around with some toy applications, exploring the
documentation and googling around (including the mailing list
archives) I am still puzzled for what I would think is a rather common
use case.

I have an existing code that generates images (in memory) and I would
like to push these images into a gstreamer pipeline (to create a flv
video at the end).

I could not find an “obvious way to do it”. My best guess will be to
dig in the source code of GstMultiFileSrc and its parent GstPushSrc,
to figure it out.

Could any of you point me out to the “obvious way” of doing this ?
Is it there any related piece of documentation/tutorial/example on this ?

Once I have the input right, the rest is a piece of cake, thanks to
Gstreamer awesomeness !
(something like “my magic input -> ffmpegcolorspace ! ffenc_flv !
flvmux ! filesink location=desktop.flv” )

Thanks for your answers.

Answer 1

GStreamer uses plugins to do everything. Plugins that create data or take it from an external source are called “src” plugins.

The generic src plugin for injecting application-generated data into a pipeline is called appsrc. The API provided by appsrc is documented as part of the App Library.

Here’s one example that demonstrates feeding appsrc with generated images: gdk-gstappsrc-stream.c. It seems to be derived from some test code in the GStreamer source tree: here.

Another approach would be to create your own src plugin. Look at the goom music visualization plugin for an example that seems to work in a way similar to what you have specified.