[Bug 748619] New: "decodebin ! encodebin" woes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748619

            Bug ID: 748619
           Summary: "decodebin ! encodebin" woes
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Windows
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: don't know
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla.gnome.org at harrym.e4ward.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 302546
  --> https://bugzilla.gnome.org/attachment.cgi?id=302546&action=edit
debug log up to access violation

Testing this generic and trivial pipeline :
  gst_parse_launch ("filesrc name=src ! decodebin name=dec ! encodebin name=enc
! filesink name=sink", &error);

I set the "location" property files for src & sink and I set "profile" for
encodebin.
The profile has valid video & audio caps for encoding :
  - container cap is "application/ogg"
  - video cap is "video/x-theora"
  - audio cap is "audio/x-vorbis"

Result: The pipeline plays thru correctly, but the resulting file has only
video, no audio.

Thinking that the problem was unconnected pads, I added a "pad-added"
signal-handler to decodebin.
Result: The encoding process continues for as long as I have patience to wait,
never finishing. In the two calls to the signal-handler, gst_pad_link() fails
with error codes GST_PAD_LINK_WAS_LINKED and GST_PAD_LINK_NOFORMAT,so it's of
not much use anyway.

I abolished the "pad-added" signal-handler and tried the following two
pipelines :
  filesrc name=src ! decodebin name=dec ! encodebin name=enc ! filesink
name=sink dec.audio_00 ! enc.
and
  filesrc name=src ! decodebin name=dec ! encodebin name=enc ! filesink
name=sink dec.audio_% ! enc.

Results:

Sometimes encoding works, generating only video. If I then close/unref all
objects and try again, I usually get an error that aborts my program and which
looks as if abort() was called.

Most often I get on first use a memory-violation exception :
  First-chance exception in myexe.exe (LIBGSTREAMER-1.0-0.DLL): 0xC0000005:
Access Violation.
I attach the debug log for the exception.

However, my main problem is how to get "decodebin ! encodebin" working.
Any advice?

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