diff --git a/Plugins/FFMPEG/FFMPEGDecoder.m b/Plugins/FFMPEG/FFMPEGDecoder.m
index bdc87bf53..fd84eb86e 100644
--- a/Plugins/FFMPEG/FFMPEGDecoder.m
+++ b/Plugins/FFMPEG/FFMPEGDecoder.m
@@ -281,6 +281,7 @@ int lockmgr_callback(void ** mutex, enum AVLockOp op)
 	return [NSDictionary dictionaryWithObjectsAndKeys:
 			[NSNumber numberWithInt:channels], @"channels",
 			[NSNumber numberWithInt:bitsPerSample], @"bitsPerSample",
+            [NSNumber numberWithBool:(bitsPerSample == 8)], @"unsigned",
 			[NSNumber numberWithFloat:frequency], @"sampleRate",
             [NSNumber numberWithBool:floatingPoint], @"floatingPoint",
 			[NSNumber numberWithDouble:totalFrames], @"totalFrames",