[gstreamer-bugs] [Bug 160179] New: Clicks inserted into mulawenc encoded output

bugzilla-daemon at bugzilla.gnome.org bugzilla-daemon at bugzilla.gnome.org
Wed Dec 1 22:39:49 PST 2004

GStreamer | gst-plugins | Ver: 0.8.6

           Summary: Clicks inserted into mulawenc encoded output
           Product: GStreamer
           Version: 0.8.6
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: jeff at ollie.clive.ia.us
         QAContact: gstreamer-bugs at lists.sourceforge.net

Transcode an audio file using the following command:

gst-launch filesrc location="restore-donormessage1.wav" ! wavparse !
audioconvert ! audioscale ! mulawenc ! audio/x-mulaw,channels=1,rate=8000 !
filesink location="restore-donormessage1.ulaw"

The resulting file has a series of regular clicks where it appears that mulawenc
 is replacing data in the output stream with null bytes.  A similar problem can
be seen if I had used alawenc or gsmenc.

Source file: http://svr1.ocjtech.us/restore-donormessage1.wav
Result file: http://svr1.ocjtech.us/restore-donormessage1.ulaw

Here is a screenshot that compares the files in Audacity:


I imported both the source file and the result file into Audacity.  I then
duplicated the result file track and shifted the duplicate track to the right by
about 2.4s.

I'm using the gstreamer yum repository.

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