[okular] [Bug 434962] New: pdflatex Media9 movie plays in 1.3.3 but not in 20.12.3

[ferdymercury]

https://bugs.kde.org/show_bug.cgi?id=434962

            Bug ID: 434962
           Summary: pdflatex Media9 movie plays in 1.3.3 but not in
                    20.12.3
           Product: okular
           Version: 20.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: fernando.hueso at uv.es
  Target Milestone: ---

Created attachment 137072
  --> https://bugs.kde.org/attachment.cgi?id=137072&action=edit
pdf with embedded video

SUMMARY
I have a PDF file with a media9-embedded movie, that plays correctly (in
presentation mode) on apt-okular (Ubuntu 19), which has version 1.3.3.
I decided to install instead the newer version of okular via 'snap', namely
version 20.12.3. However, in this case, the movie does not play and the area
becomes black when I click to start the movie. All done in the same computer.

STEPS TO REPRODUCE
1. On Ubuntu 19, install okular via apt
2. Open the attached PDF, enter presentation mode, click to Play, all works
well 
3. Uninstall okular from apt
4. Install okular from snap
5. Open the attached PDF, click to Play, screen goes black

OBSERVED RESULT
Movie does not play in the newer okular version (snap)

EXPECTED RESULT
Movie plays independently on okular version.

SOFTWARE/OS VERSIONS
okular 20.12.3 vs 1.3.3
Ubuntu 19 (bionic), snap vs apt
Linux mountain 5.4.0-66-generic #74~18.04.2-Ubuntu SMP Fri Feb 5 11:17:31 UTC
2021 x86_64 x86_64 x86_64 GNU/Linux
apt and snap versions

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