Hi,
> if use "gst-launch playbin uri=file:///absolut/path/to/file", playbin use filesrc element by default.
> I'm created new file source, e.g. "newfilesrc", and I need that playbin use it. how can I do it?
You can take a look on Source/gst-plugins-base/tests/examples/app/appsrc-ra.c example which illustrates how to use custom source (appsrc) with playibin.
In addition you may consider using decodebin2 - something along this line: your_filesrc location=%1 ! decodebin2 ! xvimagesink
Andrey.
