[gst-devel] decodebin caps troubles with rtspsrc source

[Nicolas Aguirre]

Hi there,

I try to write a little program in C that handles rtsp streams with gst and
I have some troubles.

I create a pipeline like this one : rtspsrc ! decodebin ! fakesink
In documentation rtspsrc have "sometimes" pad and should provide data only
when in PLAYING state, so I added an callback to "pad-added" signal and set
state of my pipeline to PLAYING. My "pad-added" signal is called, and in
this callback I link rtspsrc pad with sink pad of decodebin element.
Decodebin have signals for "new-decoded-pad" so I provide a callback for
this signal too. Callback is called and I detect caps. But here troubles
comes. Caps are not always the same. Sometimes I receive fixed caps with
only one height, width, framerate and fourcc values , and sometimes i
received ranges for these values. I woul like to know how to do to always
receive right and fixed values in decodebin caps ?

"new-decoded-pad" callback have "last" boolean, in his prototype, sould this
value is 1 when they are no more pad for decodebin element ? In my test this
boolean vallue is always FALSE. My stream have audio and video.

attached my source code.

If you have ideas ... :)

Best regards,
Nicolas
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