Grabbing frames from GStreamer pipeline

[Kiran Kumar]

Hi,

I am new to this forum.

I am trying to pull frames from gstreamer pipeline and feed it to user
application. I am using appsink pad to pull out the frames while the
pipeline is in the PLAYING state.

Problem:
1. The gst_app_sink_pull_sample(), gst_sample_get_buffer() and
gst_buffer_map() hands out only streams which are of size 4096 bytes each.
I tried changing the blocksize but, there is no effect.

My goal:
To extract or pull a single frame into a single buffer and feed this buffer
as input to my application which does some image processing (I am not using
OpenCV).

I want to pull every frame from the video-source, populate the buffer (each
frame is associated with a particular buffer) and finally feed the buffer
to my application. I don't want to dump this frame into a file in my
filesystem.

Questions:
1. Are there any other ways in which I can achieve my goal without using
appsink?
2. If using appsink is the only way I can pull data from gstreamer, how can
I achieve my goal using appsink?

I appreciate any guidance.

Thanks in advance.
Kiran
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