[kwlug-disc] Converting .pptx files to multiple .png

[Bob Jonkman]

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B.S. wrote:
> Hadn't thought of exporting to png as Bob is thinking, nor much 
> considered export to pdf beyond whole slides. i.e. no transitions. 
> [...] (A 'player' would make Bob's png's unneeded?)

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 on the GTALUG
mailing list 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.
Still, it means manipulating each .pptx file separately and manually.

Thanx to all, problem solved!

- --Bob.


- --
Bob Jonkman <bjonkman at sobac.com>          Phone: +1-519-635-9413
SOBAC Microcomputer Services             http://sobac.com/sobac/
Software   ---   Office & Business Automation   ---   Consulting
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On 2016-06-20 05:36 PM, B. S. wrote:
> 
> 
> On 06/20/2016 04:20 PM, Alex K wrote:
>> LibreOffice can batch convert:
>> 
>> --convert-to output_file_extension[:output_filter_name] [--outdir
>>  output_dir] files Batch convert files. If --outdir is not
>> specified then current working dir is used as output_dir. Eg.
>> --convert-to pdf *.doc --convert-to pdf:writer_pdf_Export
>> --outdir /home/user *.doc
> 
> Cool.
> 
> Reality check me here, please ...
> 
> From what I've seen, impress doesn't well suck up power point. The 
> guts seem all there, but the layout is often schmucked. On a go 
> forward basis, I've sometimes fixed it all to have a
> non-proprietary / will always work set of slides that won't have
> the 'player' pulled out from under its feet. Or redone the thing in
> native impress.
> 
> However, there's lots of power point out there. There is a 
> standalone win power point viewer, but it feels like there oughta
> be a (web) player out there, much like any audio/video
> player/plugin, to forever work in something like chromium, at
> least. Am I dreaming?
> 
> Power point content is essentially a database (just as xml is). Is
>  impress still the best reasonable way to initially create such 
> beasties?
> 
> Hadn't thought of exporting to png as Bob is thinking, nor much 
> considered export to pdf beyond whole slides. i.e. no transitions. 
> Does inkscape, krita, svg editors, or image viewers, bring
> anything to this party? (A 'player' would make Bob's png's
> unneeded?) Export to flash or html5?
> 
> 
> 
>> On Mon, Jun 20, 2016 at 3:12 PM, Bob Jonkman
>> <bjonkman at sobac.com> 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.
> 
> I can export one slide at a time from LibreOffice, but I'd much 
> rather do it in bulk from the command line.
> 
> I can convert the whole .pptx file to .pdf and then extract each 
> slide with 'pdftocairo -png [filename.pdf]' but that seems clunky, 
> and doesn't preserve transitions as individual .png files.
> 
> Is there something to do pptx2png conversion from the command
> line?
> 
> --Bob.
> 
> 
>>> 
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