diff -uNrp src/src/core/haalivideo.cpp wrk/src/core/haalivideo.cpp
--- src/src/core/haalivideo.cpp	2010-01-24 23:56:05 +0200
+++ wrk/src/core/haalivideo.cpp	2010-04-07 15:25:27 +0300
@@ -107,6 +107,11 @@ FFHaaliVideo::FFHaaliVideo(const char *S
 	CodecContext->extradata = FFMS_GET_VECTOR_PTR(CodecPrivate);
 	CodecContext->extradata_size = CodecPrivateSize;
 	CodecContext->thread_count = Threads;
+	if (Threads > 1)
+		if (avcodec_thread_init(CodecContext, Threads)) {
+			Threads = 1;
+			CodecContext->thread_count = Threads;
+		}
 
 	if (Codec == NULL)
 		throw FFMS_Exception(FFMS_ERROR_DECODING, FFMS_ERROR_CODEC,
diff -uNrp src/src/core/lavfvideo.cpp wrk/src/core/lavfvideo.cpp
--- src/src/core/lavfvideo.cpp	2010-01-24 23:56:05 +0200
+++ wrk/src/core/lavfvideo.cpp	2010-04-07 15:25:41 +0300
@@ -46,6 +46,11 @@ FFLAVFVideo::FFLAVFVideo(const char *Sou
 
 	CodecContext = FormatContext->streams[VideoTrack]->codec;
 	CodecContext->thread_count = Threads;
+	if (Threads > 1)
+		if (avcodec_thread_init(CodecContext, Threads)) {
+			Threads = 1;
+			CodecContext->thread_count = Threads;
+		}
 
 	Codec = avcodec_find_decoder(CodecContext->codec_id);
 	if (Codec == NULL)
diff -uNrp src/src/core/matroskavideo.cpp wrk/src/core/matroskavideo.cpp
--- src/src/core/matroskavideo.cpp	2010-01-24 23:56:05 +0200
+++ wrk/src/core/matroskavideo.cpp	2010-04-07 15:26:14 +0300
@@ -77,6 +77,11 @@ FFMatroskaVideo::FFMatroskaVideo(const c
 
 	CodecContext = avcodec_alloc_context();
 	CodecContext->thread_count = Threads;
+	if (Threads > 1)
+		if (avcodec_thread_init(CodecContext, Threads)) {
+			Threads = 1;
+			CodecContext->thread_count = Threads;
+		}
 
 	Codec = avcodec_find_decoder(MatroskaToFFCodecID(TI->CodecID, TI->CodecPrivate));
 	if (Codec == NULL)