[okular] [Bug 434964] New: some animated PDFs (Latex beamer) are not supported by okular

[ferdymercury]

https://bugs.kde.org/show_bug.cgi?id=434964

            Bug ID: 434964
           Summary: some animated PDFs (Latex beamer) are not supported by
                    okular
           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 137073
  --> https://bugs.kde.org/attachment.cgi?id=137073&action=edit
warning animated pdf

SUMMARY
Thanks for supporting animated Beamers in okular!

I have come to an unexpected situation, where this animated PDF plays well in
Okular:
https://texample.net/media/tikz/examples/PDF/animated-definite-integral.pdf

which uses:
`\begin{animateinline}[loop, poster = first, controls, palindrome]{2}`

But this one does not:
https://tud.qucosa.de/api/qucosa%3A29620/attachment/ATT-1/ (page 6)

that uses:
`\begin{animateinline}[controls]{1}`

and gives the warning seen in the attachment.

Both of them play well in Adobe Reader.

Do you see a similar problem? I am using version 20.12.3
Are there plans to support this type of animations in the future? (As I can not
edit that published PDF any more)

Backup info: https://community.kde.org/GSoC/2019/StatusReports/Jo%C3%A3oNetto

STEPS TO REPRODUCE
1. Open PDF from first link above. Plays well.
2. Open PDF from second link above (page 6). Does not play.

OBSERVED RESULT
Second PDF animation does not play.

EXPECTED RESULT
Both should work

SOFTWARE/OS VERSIONS
Ubuntu 19 (snap version of Okular)

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