[Bug 762929] New: simple transcoding pipeline takes over 4GB RAM

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762929

            Bug ID: 762929
           Summary: simple transcoding pipeline takes over 4GB RAM
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: exebook at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 322785
  --> https://bugzilla.gnome.org/attachment.cgi?id=322785&action=edit
dot file for the pipeline that causes the issue

I have been told on IRC that this kind of simple transcoding should take about
500 MB RAM, but I experience huge RAM usage even above 4GB. I measure RSS.
(Resident Set Size) on Ubuntu.

I have been trying various types of input streams with about the same results.
The memory consumption grows after hours. But will peak at about 4GB and not
grow since then. With a few transcoders running, the kernel will start killing
them.

Most of memory is consumed by x264enc, but the mpegdecoder is also hungry. I
can tell this from vagrind --massif. I cannot attach two files here I guess. I
never got 4GB consumption under vagrind/massif, I think because it runs slower. 

Not sure if this is considered a bug, but since I've been told that is should
definitely be under 1 GB I think there is a chance it is.

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