Gets the sample that is at the given index for the given tag in the given
list and copies it into the variable pointed to by smple. Free the sample
with gst_sample_unref() when it is no longer needed. You can retrieve the
buffer from the sample using gst_sample_get_buffer() and the associated
caps (if any) with gst_sample_get_caps().
Free-function: gst_sample_unref
Gets the sample that is at the given index for the given tag in the given list and copies it into the variable pointed to by smple. Free the sample with gst_sample_unref() when it is no longer needed. You can retrieve the buffer from the sample using gst_sample_get_buffer() and the associated caps (if any) with gst_sample_get_caps(). Free-function: gst_sample_unref