Return a copy of @size bytes from @mem starting from @offset. This copy is guaranteed to be writable. @size can be set to -1 to return a copy all bytes from @offset.
an offset to copy
size to copy or -1 to copy all bytes from offset
Return: a new #GstMemory.
See Implementation
Return a copy of @size bytes from @mem starting from @offset. This copy is guaranteed to be writable. @size can be set to -1 to return a copy all bytes from @offset.