diff --git a/ChangeLog b/ChangeLog
index 922ecee642..31042a1940 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2005-08-31  Wim Taymans  <wim@fluendo.com>
+
+	* gst/base/gstbasetransform.c: (gst_base_transform_handle_buffer):
+	passthrough elements can even do inplace on non writable
+	buffers (as they don't touch them).
+
 2005-08-31  Stefan Kost  <ensonic@users.sf.net>
 
 	* check/gst-libs/controller.c: (gst_test_mono_source_get_property),
diff --git a/gst/base/gstbasetransform.c b/gst/base/gstbasetransform.c
index 2294853a6b..3a253713e5 100644
--- a/gst/base/gstbasetransform.c
+++ b/gst/base/gstbasetransform.c
@@ -815,8 +815,13 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
     GST_LOG_OBJECT (trans, "... and offset NONE");
 
   if (trans->in_place) {
-    /* check if we can do inplace and the buffer is writable */
-    if (bclass->transform_ip && gst_buffer_is_writable (inbuf)) {
+    /* passthrough elements or when the buffer is writable
+     * can be performed with the _ip method */
+    gboolean may_do_in_place = gst_buffer_is_writable (inbuf) ||
+        trans->passthrough;
+
+    /* check if we can and may do inplace */
+    if (bclass->transform_ip && may_do_in_place) {
       /* in place transform and subclass supports method */
       GST_LOG_OBJECT (trans, "doing inplace transform");
       gst_buffer_ref (inbuf);
diff --git a/libs/gst/base/gstbasetransform.c b/libs/gst/base/gstbasetransform.c
index 2294853a6b..3a253713e5 100644
--- a/libs/gst/base/gstbasetransform.c
+++ b/libs/gst/base/gstbasetransform.c
@@ -815,8 +815,13 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
     GST_LOG_OBJECT (trans, "... and offset NONE");
 
   if (trans->in_place) {
-    /* check if we can do inplace and the buffer is writable */
-    if (bclass->transform_ip && gst_buffer_is_writable (inbuf)) {
+    /* passthrough elements or when the buffer is writable
+     * can be performed with the _ip method */
+    gboolean may_do_in_place = gst_buffer_is_writable (inbuf) ||
+        trans->passthrough;
+
+    /* check if we can and may do inplace */
+    if (bclass->transform_ip && may_do_in_place) {
       /* in place transform and subclass supports method */
       GST_LOG_OBJECT (trans, "doing inplace transform");
       gst_buffer_ref (inbuf);