diff --git a/src/add-ons/media/plugins/musepack/MusePackDecoder.cpp b/src/add-ons/media/plugins/musepack/MusePackDecoder.cpp
index 220a30bf3b..7c0b35dd7f 100644
--- a/src/add-ons/media/plugins/musepack/MusePackDecoder.cpp
+++ b/src/add-ons/media/plugins/musepack/MusePackDecoder.cpp
@@ -9,6 +9,8 @@
 
 
 MusePackDecoder::MusePackDecoder()
+	:
+	fDecoder(NULL)
 {
 }
 
@@ -26,6 +28,8 @@ MusePackDecoder::Setup(media_format *ioEncodedFormat, const void *infoBuffer, in
 		return B_BAD_VALUE;
 
 	fDecoder = (MPC_decoder *)infoBuffer;
+	fFrameRate = fDecoder->fInfo->simple.SampleFreq;
+	fStartTime = 0;
 	return B_OK;
 }
 
@@ -36,7 +40,7 @@ MusePackDecoder::NegotiateOutputFormat(media_format *format)
 	// ToDo: rework the underlying MPC engine to be more flexible
 
 	format->type = B_MEDIA_RAW_AUDIO;
-	format->u.raw_audio.frame_rate = fDecoder->fInfo->simple.SampleFreq;
+	format->u.raw_audio.frame_rate = fFrameRate;
 	format->u.raw_audio.channel_count = fDecoder->fInfo->simple.Channels;
 	format->u.raw_audio.format = media_raw_audio_format::B_AUDIO_FLOAT;
 	format->u.raw_audio.byte_order = B_MEDIA_HOST_ENDIAN;
@@ -55,6 +59,7 @@ MusePackDecoder::NegotiateOutputFormat(media_format *format)
 status_t 
 MusePackDecoder::Seek(uint32 seekTo, int64 seekFrame, int64 *frame, bigtime_t seekTime, bigtime_t *time)
 {
+	fStartTime = 0;
 	return B_OK;
 }
 
@@ -64,10 +69,15 @@ MusePackDecoder::Decode(void *buffer, int64 *_frameCount, media_header *mediaHea
 {
 	// ToDo: add error checking (check for broken frames)
 
+	mediaHeader->start_time = fStartTime;
+
 	uint32 ring = fDecoder->Zaehler;
-	*_frameCount = fDecoder->DECODE((MPC_SAMPLE_FORMAT *)buffer);
+	off_t frameCount = fDecoder->DECODE((MPC_SAMPLE_FORMAT *)buffer);
 	fDecoder->UpdateBuffer(ring);
 
+	fStartTime += bigtime_t(1000.0 * frameCount * FRAMELEN / (fFrameRate / 1000) + 0.5);
+	*_frameCount = frameCount;
+
 	return B_OK;
 }
 
diff --git a/src/add-ons/media/plugins/musepack/MusePackDecoder.h b/src/add-ons/media/plugins/musepack/MusePackDecoder.h
index 3fad36e467..eb8141e012 100644
--- a/src/add-ons/media/plugins/musepack/MusePackDecoder.h
+++ b/src/add-ons/media/plugins/musepack/MusePackDecoder.h
@@ -31,6 +31,8 @@ class MusePackDecoder : public Decoder {
 	private:
 		MPC_decoder	*fDecoder;
 		StreamInfo	*fInfo;
+		float		fFrameRate;
+		off_t		fStartTime;
 };
 
 #endif	/* MUSEPACK_DECODER_H */