[GTALUG] Converting .pptx files to multiple .png

[Bob Jonkman]

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Thanx to all, problem solved! Allan Zhang's suggestion made all the
difference.

A bit of background, for those interested in TMI:

I recorded a presentation on the weekend, and was given a copy of the
.pptx presentations so I could follow along on my computer recording
the audio and keep the slides in synch (kudos to Kirk Zurell for
inspiring me; this is how he recorded Paul Nijjar's "How to Win
Electoral Reform" presentation last year).

Unfortunately, many of the fancy slide transitions didn't work in
LibreOffice; I got lost a couple of times and had to back up (so much
for synching with audio); and anyway, recordmydesktop didn't keep up,
so there were pixel blocks from earlier slides obscuring the current
slide (but the --full-shots parameter might have fixed that).

The idea was that the video (recorded separately) and screencap could
have been combined in KDEnlive to make a nice integrated video. But
since the screencap video is useless, now I'm looking at grabbing each
presentation slide as a .png and adding that to KDEnlive as a static
image.

Unfortunately, slides where the text appears progressively doesn't
translate well to .pptx -> .pdf -> .png, but Alex Zhang pointed me to
the "Expand Animations" .oxt plugin
https://github.com/monperrus/ExpandAnimations/issues  It's not perfect
(doesn't preserve master slide background colors or gradients), but it
creates an intermediate *-expanded.odp file that I can work with.
While it means manipulating each .pptx file separately and manually,
it does mean that my problem is solved with the application of a bit
of manual labour.

- --Bob.


On 2016-06-20 03:58 PM, Allan Zhang via talk wrote:
> On Mon, Jun 20, 2016 at 03:33:25PM -0400, Allan Zhang wrote:
>> Try libreoffice --headless --convert-to png *.pptx
> Sorry, ignore this. This will only convert the first slide of each
> pptx.
> 
> You could batch convert to pdf with libreoffice --headless
> --convert-to pdf *.pptx and use unoconv of ImageMagick convert like
> Myles said.
> 
> Bob, I think this extension may be what you are looking for: 
> http://www.monperrus.net/martin/export+animations+to+pdf+in+libreoffice-openoffice
>
> 
> 
> Hopefully it works and you are able to find a way to automate it
> for multiple files.
> 
>> - -------- Original Message -------- From: Myles Braithwaite via
>> talk <talk at gtalug.org> Sent: June 20, 2016 3:25:45 PM EDT To: Bob
>> Jonkman <bjonkman at sobac.com>, GTALUG Talk <talk at gtalug.org> 
>> Subject: Re: [GTALUG] Converting .pptx files to multiple .png
>> 
>> Bob Jonkman via talk wrote:
>>> Hi: I've got a bunch of .pptx (Microsoft PowerPoint) files that
>>> I'd like to convert to individual .png files for each slide,
>>> preferably where each step in a transition becomes its own .png
>>> file.
>> 
>> You can use unoconv[0] (a universal office converter that works
>> with anything that LibreOffice or OpenOffice support) to convert
>> them to a pdf file. Then use ImageMagick[1] to convert them to
>> png files.
>> 
>> Here is a quick script (that probably doesn't work so don't blame
>> me if it fails) on how I would start doing it: 
>> <https://gist.github.com/myles/3656ebcb3026b455d1b3be52d5bd3a58>.
>>
>>
>> 
Hope this helps.
>> 
>> [0]: <https://github.com/dagwieers/unoconv> [1]:
>> <http://www.imagemagick.org/script/index.php> - --- Talk Mailing
>> List talk at gtalug.org https://gtalug.org/mailman/listinfo/talk 
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