https://bugzilla.mozilla.org/show_bug.cgi?id=761030

Went into Fx 16, but not 15

diff -r 07d362aa2c1b content/media/gstreamer/nsGStreamerReader.cpp
--- a/content/media/gstreamer/nsGStreamerReader.cpp	Sun Jun 03 12:04:40 2012 -0700
+++ b/content/media/gstreamer/nsGStreamerReader.cpp	Sun Jun 03 14:37:55 2012 -0700
@@ -447,16 +447,18 @@ bool nsGStreamerReader::DecodeVideoFrame
   for(int i = 0; i < 3; i++) {
     b.mPlanes[i].mData = data + gst_video_format_get_component_offset(format, i,
         width, height);
     b.mPlanes[i].mStride = gst_video_format_get_row_stride(format, i, width);
     b.mPlanes[i].mHeight = gst_video_format_get_component_height(format,
         i, height);
     b.mPlanes[i].mWidth = gst_video_format_get_component_width(format,
         i, width);
+    b.mPlanes[i].mOffset = 0;
+    b.mPlanes[i].mSkip = 0;
   }

   bool isKeyframe = !GST_BUFFER_FLAG_IS_SET(buffer,
       GST_BUFFER_FLAG_DELTA_UNIT);
   /* XXX ? */
   PRInt64 offset = 0;
   VideoData *video = VideoData::Create(mInfo,
                                        mDecoder->GetImageContainer(),
