[gstreamer-bugs] [Bug 430085] New: aac encoder output not interoperable with aac decoder, possibly erroneous

GStreamer (bugzilla.gnome.org) bugzilla-daemon at bugzilla.gnome.org
Sun Apr 15 13:04:41 PDT 2007

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  GStreamer | gst-plugins-bad | Ver: 0.10.4
           Summary: aac encoder output not interoperable with aac decoder,
                    possibly erroneous
           Product: GStreamer
           Version: 0.10.4
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: tawmas at tawmas.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.17/2.18
   GNOME milestone: Unspecified

Please describe the problem:
Songs imported from audio CDs using the default AAC seetings (Gstreamer
pipeline: audio/x-raw-int,rate=44100,channels=2 ! faac ! ffmux_mp4) don't play
back correctly. They constantly skip or jitter, and audio quality is ugly at
best. Often, music is not even recognizable. Processor usage during playback is
quite low, and free RAM is also not a prolem.
The same audio files, uploaded onto an iPod, play back very fine, although
reported track duration is incorrect (for example, 15'+ reported for a circa 4'
song). Still the same audio files, when played inside the latest iTunes on
Windows, also play back fine and report the correct track duration.
Please, also note that other audio files, previously imported from audio CDs
though the latest iTunes on Windows using the same hardware, play back just
fine in all Gstreamer-based players that can't play back the files encoded
through the Gstreamer AAC encoder. I think this might point to a problem in the
encoder rather than the decoder, but feel free to ignore this as uninformed
guess at best.

I can attach or post a sample encoded track, which I think I could do under
fair use. Please let me know if this is acceptable and if this could be

Steps to reproduce:
1. Ensure you have the AAC encoder and decoder plugins
2. Insert non-drm-protected audio CD
3. Start Sound Juicer
4. From Edit | Preferences, select Output format CD Quality, AAC (MPEG 4 audio)
5. Import the CD
6. Play the songs in any Gstreamer-based player (Totem, Rhythmbox, Exaile!,

Actual results:
Playback is ugly (constant jitters, noise, distorted or unrecognizable audio)

Expected results:
Playback is fine

Does this happen every time?

Other information:

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