Append @size bytes at @offset from @buf2 to @buf1. The result buffer will contain a concatenation of the memory of @buf1 and the requested region of @buf2.
the second source #GstBuffer to append.
the offset in @buf2
the size or -1 of @buf2
the new #GstBuffer that contains the memory of the two source buffers.
See Implementation
Append @size bytes at @offset from @buf2 to @buf1. The result buffer will contain a concatenation of the memory of @buf1 and the requested region of @buf2.