appsink buffer size control

[George Demetriades]

I'm writing a C++ program which involves passing a whole uncompressed video
frame from my gstreamer pipeline through to my own application for
processing, but I'm not able to make the pulled buffer the correct size.
The I420 frame I want to pull is at 480 x 360, with 8 bits per pixel:
including the chroma segment of the frame, this should be 259,200 bytes.
Instead, GST_BUFFER_SIZE shows the pulled frame to only be 26,496 bytes
large - obviously far too small.

Would anyone be able to tell me how to fix the size of the buffer coming
from my pipeline into the appsink? Is that even a parameter that the
developer can control, or is it an internally-decided size?

For reference, I'm running h264-encoded video from a udpsrc, through
flutsdemux (to strip out the audio), through a fluh264dec (to decode the
video into raw frames) and then into my appsink.

Any help or guidance would be greatly appreciated, I've been struggling
with this for a few days now.
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