Index: /trunk/src/VBox/Main/src-client/DrvAudioVideoRec.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/DrvAudioVideoRec.cpp	(revision 74840)
+++ /trunk/src/VBox/Main/src-client/DrvAudioVideoRec.cpp	(revision 74841)
@@ -524,5 +524,7 @@
 
             /* Every Opus frame marks a period for now. Optimize this later. */
-            pCfgAcq->Backend.cfPeriod  = DrvAudioHlpMilliToFrames(pSink->Codec.Opus.msFrame, &pCfgAcq->Props); /** @todo Make this configurable. */
+            pCfgAcq->Backend.cfPeriod     = DrvAudioHlpMilliToFrames(pSink->Codec.Opus.msFrame, &pCfgAcq->Props);
+            pCfgAcq->Backend.cfBufferSize = DrvAudioHlpMilliToFrames(100 /* ms */, &pCfgAcq->Props); /** @todo Make this configurable. */
+            pCfgAcq->Backend.cfPreBuf     = pCfgAcq->Backend.cfPeriod * 2;
         }
     }