diff --git a/video.go b/video.go
index aeaa242..6873977 100644
--- a/video.go
+++ b/video.go
@@ -20,7 +20,7 @@ func (this *Thumbnailer) RenderScaledFfmpeg(absPath string) ([]byte, error) {
 	var vcodec string
 	switch this.ofmt {
 	case OUTPUT_JPG:
-		vcodec = "jpg"
+		vcodec = "mjpeg" // yes really
 	case OUTPUT_PNG_CRUSH:
 		vcodec = "png"
 	default: