Post-editing of a Zoom recording

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Warning: academic / geeky / Cornell-only sections ahead

I recently recorded a Zoom meeting/ webinar. How well that went is a different story. Here’s a commented list of tasks I did for post-processing it into a video to be posted online.


  • Zoom 4.6.7 (Windows) for recording
  • ScreenFlow 7.3.1 on MacOS 10.14.6 for editing
  • Cornell’s Video-on-demand service (Kaltura)


ScreenFlow is not per-se a video-editing tool, but meant as a screen recording tool. The version I used is not the latest. I just happen to have had it. It had some issues (black screen). Mostly, it had the feature I needed: adding overlays and copying/ cutting in video and stills.

Steps taken


The video was recorded with Zoom’s cloud recording. Once the video was recorded (I stopped before the Q&A), it got posted to the (private) cloud. Cornell’s subscription has a 120 day deletion policy, but also automatically moves the video into Kaltura (as a private video).

  • Kaltura does not allow to edit the video other than to cut out pieces at the start and the end (as far as I can tell)
  • Kaltura does do automatic transcription
  • I have not figured out how to download a video from Kaltura…


  • I downloaded the video from Zoom’s cloud storage, and stored a local copy.
  • (Cornell-only) I also downloaded the “Video Bug” from Cornell’s brand page.
  • (Me-only) I created a visual “CV” page, in Powerpoint, and exported it as a PNG. (note to self: that picture was taken 6 years ago…)


  • I edited out the start (recording of me setting up).
  • I also overlaid a clean PNG of my slide, rather than the recording of the first slide. That means that the picture-in-picture (PIP) of me fades in about 45s into the talk. Your preferences may vary.
  • Within the first 2-3 minutes, I edited out the “ums” and “ahs”. I need to a while to warm up. But I do speak slowly at first, with an attempt to have distinct pauses – makes it easy to edit this out. YMMV.
    • ScreenFlow tip: i starts marking a section, o ends the section, ⌘-delete cuts that section out, and moves the rest up.
  • I then ignored the rest, up through the end of the talk.
  • I did a bit of editing at the end, taking out the verbal setup of the Q&A (not relevant if viewing the recording), and most everything after I show the final slide.
  • I then added back in a PNG of the “Thank you slide” (with the DOI of the slides), and leave that on screen for 2s.
  • I then added the CV PNG, and leave that on-screen for 2s.
  • I then added the Cornell Video Bug (logo, fade out)
    • Based on the counsel of an in-house Youtube consultant with vast experience, the Cornell Video Bug is too long (“boring, Dad!”). I therefore shortened the time it stays on screen substantially.
    • i , o, ⌘-delete
  • Finally, I added a text field for copyright, and added the license logo for the CC-BY-NC license that I want to apply to this video.
  • Rendered the whole thing for 1920×1080 video.

Here’s the end sequence (as a GIF):


I uploaded to both Cornell’s VOD and Youtube

  • Kaltura (VOD) only has a free-form field for license. I entered “CC-BY-NC”
  • Youtube only offers Youtube license and base CC-BY. I chose “Youtube”.
  • In both cases, I added the abstract and as much metadata as each platform allowed.

End result


Cornell VOD Platform (Kaltura)