avidemux: support raw video with negative height

https://bugzilla.gnome.org/show_bug.cgi?id=695541

diff --git a/gst/avi/gstavidemux.c b/gst/avi/gstavidemux.c
index 49364eb..8bc0107 100644 (file)
--- a/gst/avi/gstavidemux.c
+++ b/gst/avi/gstavidemux.c
@@ -4544,6 +4544,10 @@ gst_avi_demux_invert (GstAviStream * stream, GstBuffer * buf)
     return buf;                 /* Ignore non DIB buffers */
   }
 
+  /* raw rgb data is stored topdown, but instead of inverting the buffer, */
+  /* some tools just negate the height field in the header (e.g. ffmpeg) */
+  if (((gint32) stream->strf.vids->height) < 0)
+    return buf;
 
   h = stream->strf.vids->height;
   w = stream->strf.vids->width;