Add a log to know what configuration lead to the initialization error.

mswasapi_reader.cpp

@@ -199,6 +199,8 @@ int MSWASAPIReader::activate()
 	return 0;
 
 error:
+	ms_error("Wasapi capture couldn't be initialized at %i Hz, %i channels, with buffer size %i (%i ms), %i-bit frames are on %i bits", (int)mRate, (int)mNChannels,
+		(int)mBufferFrameCount, (int)1000*mBufferFrameCount/ (mRate > 0 ? mRate : -1), (pUsedWfx ? (int)pUsedWfx->wBitsPerSample : -1), mNBlockAlign*8);
 	FREE_PTR(pSupportedWfx);
 	if(mAudioClient) mAudioClient->Reset();
 	return -1;

mswasapi_writer.cpp

@@ -204,6 +204,8 @@ int MSWASAPIWriter::activate()
 	return 0;
 
 error:
+	ms_error("Wasapi playback couldn't be initialized at %i Hz, %i channels, with buffer size %i (%i ms), %i-bit frames are on %i bits", (int)mRate, (int)mNChannels,
+		(int)mBufferFrameCount, (int)1000*mBufferFrameCount/ (mRate > 0 ? mRate : -1), (pUsedWfx ? (int)pUsedWfx->wBitsPerSample : -1), mNBlockAlign*8);
 	FREE_PTR(pSupportedWfx);
 	if(mAudioClient) mAudioClient->Reset();
 	return -1;