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I’ve worked around this by using a 2GB real-time buffer by adding the -rtbufsize 2000M switch.

The other problem that I mentioned was dropped frames and corresponding choppy audio. Checking this box solved the resolution reporting problem! Within the ‘Settings’ group there is a checkbox giving the option to “Disable display scaling on high DPI settings”. So, right clicking on the ffmpeg.exe executable and choosing the ‘properties’ option from the context menu a ‘compatibility’ tab exists.

It occurred to me that the good folk at Microsoft might have considered that this feature could have unforeseen consequences.

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The first issue was that of Windows 8 desktop scaling tricking ffmpeg into reporting the wrong screen resolution. After a bit of playing around, I seem to have solved these, so I thought that I’d mention it here. In my previous post I mentioned a couple of issues that I encountered using ffmpeg to screencast on from the Surface Pro. Nonetheless, I believe that the activity is highly worthwhile from an educational point of view. This week was slightly better than last week because there were no A/V sync issues requiring extensive editing. It’s not clear whether this helps or not, but the setup works, so I’m happy.įinally, I wasn’t prepared for how much time preparing screencasts would take! It’s become pretty much a full-time job just to keep on top of editing/uploading the recorded lecture material, which leaves very little time for producing additional screencasts. I’m not sure if this helps, but my thinking was to utilise a single thread on a single core for video and audio capture and leave the other CPU core available for SPSS and TightVNC. You may also notice that I used the ‘ -threads 1’ switch. My current ffmpeg capture command is:įfmpeg –rtbufsize 2000M –r 8 –threads 1 –f dshow –i video=”screen-capture-recorder”:audio=”” –s 1280x720 –vcodec libx264 –crf 0 –preset ultrafast –acodec pcm_s161e output.mkv This works well for presentations and I haven’t noticed any problems when it comes to editing. This has been resolved by setting the capture framerate to 8 fps. Initially I did have audio/video sync issues. Regarding live screen-capture, I’m using ffmpeg. But, on balance, I think that annotation is much more useful. A minor drawback is that PowerPoint animations don’t work like this.

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It turns out that PDF documents can be directly imported into open-sankore and then pages can be annotated.

I’m also finding open-sankore to be an excellent tool. However, to keep it in check, what I have found helpful is to keep the laptop screen (wired to the VGA input of the projector) within view as a kind of monitor of what is happening on the over-head screen. The wireless display technology via TightVNC seems to be working reasonably well and I’m getting used to waiting for screen updates when switching slide or switching to a browser.

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I’ve now just completed my 3 rd lecture in the iteachstats series, so I thought that now would be a good time to update the blog.