--- a/dom/media/fmp4/gonk/GonkVideoDecoderManager.cpp
+++ b/dom/media/fmp4/gonk/GonkVideoDecoderManager.cpp
@@ -289,18 +289,20 @@ GonkVideoDecoderManager::SetVideoFormat(
     mFrameInfo.mSliceHeight = slice_height;
     mFrameInfo.mColorFormat = color_format;
 
     nsIntSize displaySize(width, height);
     if (!IsValidVideoRegion(mInitialFrame, mPicture, displaySize)) {
       ALOG("It is not a valid region");
       return false;
     }
+    return true;
   }
-  return true;
+  ALOG("Fail to get output format");
+  return false;
 }
 
 // Blocks until decoded sample is produced by the deoder.
 nsresult
 GonkVideoDecoderManager::Output(int64_t aStreamOffset,
                                 nsAutoPtr<MediaData>& aOutData)
 {
   aOutData = nullptr;