- * fragment-based playback model. We do this setting the source
- * latency to the fragment size. */
+ * fragment-based playback model. Unfortunately we have no
+ * mechanism to tell the source how often we want it to send us
+ * data. The next best thing we can do is to set the source's
+ * total buffer (i.e. its latency) to the fragment size. That
+ * way it will have to send data at least that often. */