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audiovisualizers: spectrascope: SIGSEGV when shader fade-and-move-horiz-out(6)

The following pipeline fails with SIGSEGV

gst-launch-1.0 audiotestsrc num-buffers=1 ! spectrascope shader=6 ! fakesink

The error is invariant of audio source and video sink or the presence of buffers

Behaviour

SIGSEGV caught, core dumped. See info below.

Expected Behaviour

Pipeline should run normally and stop after EOS as with other shaders

gst-launch-1.0 audiotestsrc num-buffers=1 ! spectrascope shader=8 ! fakesink

System

Linux diamond-tiara 5.16.10-arch1-1 #1 SMP PREEMPT Wed, 16 Feb 2022 19:35:18 +0000 x86_64 GNU/Linux

Plugin Details:
  Name                     audiovisualizers
  Description              Creates video visualizations of audio input
  Filename                 /usr/lib/gstreamer-1.0/libgstaudiovisualizers.so
  Version                  1.20.0
  License                  LGPL
  Source module            gst-plugins-bad
  Source release date      2022-02-03
  Binary package           Arch Linux gst-plugins-bad 1.20.0-2
  Origin URL               https://www.archlinux.org/

Coredump Info

           UID: 1000
           GID: 1000
        Signal: 11 (SEGV)
     Timestamp: Fri 2022-02-18 19:56:53 CET (20s ago)
  Command Line: gst-launch-1.0 audiotestsrc num-buffers=1 $'!' spectrascope shader=6 $'!' fakesink
    Executable: /usr/bin/gst-launch-1.0
 Control Group: /user.slice/user-1000.slice/session-1.scope
          Unit: session-1.scope
         Slice: user-1000.slice
       Session: 1
     Owner UID: 1000