I want to be able to convert ppt to video files automatically, without user interaction on Windows. Like convert_ppt_to_video qqq.pptx --screen-size 1024x768 -o qqq.mkv.

How it's better to attain this? What programs should I use?

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You should just set the slides to automatically progress to the next slide after a given amount of time. Then, if you have a hypercam (screenshot-like video recorder), record the slideshow. Then crop the start and finish times to your desired times.

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OK. Now thinking how to make all this unattended and in background. – Vi. Dec 19 '11 at 15:04
What exactly are you going to use the presentation/video for? – CodeAdmiral Dec 19 '11 at 15:11
Playing it on remote GNU/Linux system without user interaction. – Vi. Dec 19 '11 at 16:13
Then my solution should work, because you just want a video that plays without anybody having to do anything, right? – CodeAdmiral Dec 19 '11 at 17:38
Yes. /* Won't accept this answer because of info about which programs are best for it hasn't been presented */ – Vi. Dec 19 '11 at 18:06
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Looks like it can be done with PowerPoint for showing the presentation, RDP client for setting the screen resolution and Screen Capture Recorder + VLC to record it to file.

vlc.exe  -I dummy dshow://screen-capture-recorder --sout '#transcode{vcodec=theora,vb=1500}:standard{access=file,mux=ogg,dst="d:/home/fff.ogg"}'
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Do you mean running comand line on Windows? I don't think it's possible! As to programs, it's recommended to use Leawo PowerPoint to Video Pro or Moyea PPT to Video Converter. As far as I know, they are the only two powerpoint to video brands that can preserve original effects, videos and background music. However, neither of them supports command line.

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Please refer to this article "How to Convert PowerPoint to MKV". With Moyea PPT to Video Converter, you can convert PowerPoint to video just by clicking the "convert" button. Then, wait for the high quality output video.

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