[gst-devel] Failed to free the memory allocated by gst_pad_alloc_buffer_and_set_caps()

[Hu, Gang A]

Hi,
I had a v4l2 camera driver with the "V4L2_MEMORY_USERPTR" type memory support and a camera source element "v4l2newcamsrc" to support this type memory.
When I running the pipeline bellow
"gst-launch v4l2newcamsrc num-buffers=1 ! ffmpegcolorspace ! video/x-raw-yuv,width=640,height=480 ! filesink  location=image_640.yuv"
The image can be captured successfully.
But when the buffers are freed in the camera source element, there will always be an error message in the terminal.

*** glibc detected *** /usr/local/meego/bin/gst-launch-0.10: free(): invalid pointer: 0xb73c8008 ***
======= Backtrace: =========
/lib/libc.so.6[0x550cc1]
/usr/local/meego/lib/libgstreamer-0.10.so.0(+0x29c06)[0xb7792c06]
/usr/local/meego/lib/libgstreamer-0.10.so.0(gst_mini_object_unref+0xaf)[0xb77b94df]
.

I use gst_pad_alloc_buffer_and_set_caps() to allocate the buffer from the download element in the camera source element.
When the application exit, gst_buffer_unref (buffer) will be called to free the memory. This code case the error above after debugging with GDB.

I have two questions about that.
1.      Which element is responsible for the memory allocation when call "gst_pad_alloc_buffer_and_set_caps()" in camera source element in my pipeline.
2.      How to free the memory allocated by "gst_pad_alloc_buffer_and_set_caps()"? Why the error "free(): invalid pointer: 0xb73c8008 ***" occurred.



Thanks.
Best Regards!
Hu Gang



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