I checked this potential bug is not only in 0.10.32, but also 0.10.34 and 0.11.0.

Hi Developers,

I found one potential bug in gst_text_overlay_text_chain() in
ext/pango/gsttextoverlay.c (as the mail title).

If looked at this piece of code,
 ...
 if (G_LIKELY (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))) {

   ...
   in_seg = gst_segment_clip (&overlay->text_segment, GST_FORMAT_TIME,
       GST_BUFFER_TIMESTAMP (buffer), stop, &clip_start, &clip_stop);
 } else {
   in_seg = TRUE;
 }

if (in_seg) {
 ...
 }
 GST_OBJECT_UNLOCK (overlay); // NOTE the buffer will not be unref in
case of in_seg == FALSE

beach:

 return ret;
}

If the in_seg == TRUE, the text buffer will render the text and push
into the queue.

But if in_seg = FALSE, the text buffer will not be unrefed. So I think
this is the bug and should add code to handle unref the buffer in case
of in_seg == FALSE.

Or it will have memory leakage.

Let me know if I am wrong.