[gstreamer-bugs] [Bug 607641] New: snapping when converting aac (from flv) to mp3/vorbis

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=607641
  GStreamer | gstreamer (core) | 0.10.25

           Summary: snapping when converting aac (from flv) to mp3/vorbis
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.25
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: kassoulet at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Download a HD flv from youtube. Try to convert the sound to mp3 or vorbis. You
can clearly ear snapping. Maybe some form of buffer holes or clipping, can't
say, but anyway it sounds awful.

Tested on Ubuntu karmic. With both soundconverter and gst-launch.

gst-launch-0.10 --gst-debug=2 filesrc location=test.flv name=src ! decodebin
name=decoder ! audioconvert ! vorbisenc ! oggmux  ! filesink location=test.ogg

The only warning reported by gst-launch:
0:00:34.248300504  9551      0x16f7580 WARN               vorbisenc
vorbisenc.c:1197:gst_vorbis_enc_chain:<vorbisenc0> Buffer is older than
previous timestamp + duration (0:01:12.446000000< 0:01:12.446219954), cannot
handle. Clipping buffer.
0:00:34.250140797  9551      0x16f7580 WARN               vorbisenc
vorbisenc.c:1220:gst_vorbis_enc_chain:<vorbisenc0> Buffer is discontinuous,
flushing encoder and restarting (Discont from 0:01:12.449553288 to
0:01:12.493000000)

If I insert a "wavenc ! wavparse" in the pipeline, the sound is ok.

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