Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality

[Francesco Poli (wintermute)]

Package: libgstreamer1.0-0
Version: 1.10.4-1
Severity: important

Hello maintainers of GStreamer packages!
First off, thanks for maintaining these packages in Debian.

I am experiencing an issue with GStreamer: I noticed it inside
pdf-presenter-console (which uses libgstreamer1.0-0 to play back
movies in PDF documents). But I can reproduce the same exact issue
outside pdf-presenter-console, with the following command:

  $ gst-launch-1.0 filesrc location=movie.avi \! decodebin \! autovideosink

where movie.avi is an MJPEG AVI file (created with paraview, by using
the default Save Animation... menu entry and by choosing to save the
animation as an AVI file).

Well, the above quoted gst-launch-1.0 command displays the AVI file
at degraded quality, while using mpv plays the same file without visible
quality degradation:

  $ mpv movie.avi


I am filing this bug report against version 1.10.4-1 (current version
in Debian testing), but I have also given version 1.12.0-2 (from
experimental) a try: I am able to reproduce the same exact bug with
libgstreamer1.0-0/1.12.0-2 ...

Please try to reproduce the bug and to fix it and/or forward my bug
report upstream.

I really hope to hear back from you very soon.
Thanks for your time!


-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (800, 'testing'), (500, 'unstable')
Architecture: amd64
 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libgstreamer1.0-0 depends on:
ii  libc6         2.24-10
ii  libcap2       1:2.25-1
ii  libcap2-bin   1:2.25-1
ii  libglib2.0-0  2.50.3-2

libgstreamer1.0-0 recommends no packages.

Versions of packages libgstreamer1.0-0 suggests:
ii  gstreamer1.0-tools  1.10.4-1

-- no debconf information