cogvirtframe.c:1874 allocates temporary storage that is never filled
cogvirtframe.c:1859 uses this as a source rather than 'src' set on the previous line

Sorry no gstreamer patch, I have my own private libcog with this applied:


--- a/cog/cogvirtframe.c
+++ b/cog/cogvirtframe.c
@@ -2170,7 +2170,7 @@ convert_u8_s16 (CogFrame * frame, void *_dest, int component, int i)
   int16_t *src;
 
   src = cog_virt_frame_get_line (frame->virt_frame1, component, i);
-  orc_convert_u8_s16 (dest, frame->virt_priv,
+  orc_convert_u8_s16 (dest, src,
       frame->components[component].width);
 }
 
@@ -2185,7 +2185,6 @@ cog_virt_frame_new_convert_u8 (CogFrame * vf)
   virt_frame = cog_frame_new_virtual (vf->domain, format, vf->width, vf->height);
   virt_frame->virt_frame1 = vf;
   virt_frame->render_line = convert_u8_s16;
-  virt_frame->virt_priv = cog_malloc (sizeof (int16_t) * vf->width);
 
   return virt_frame;
 }