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Cisco TelePresence IP VCR Series

Storing PowerPoint presentations that include a lot of motion

What is the best way to store PowerPoint presentations on the IP VCR when they include a lot of motion?

A PowerPoint presentation would normally be shown in a H.239 data channel during a conference. If H.239 is enabled on the IP VCR, it records the H.239 channel using DJPEG and this can achieve high resolutions at low frame rates. This is exactly what is required for presentations that are largely static.

In contrast, the main video channel normally uses lower resolutions at high frame rates, though this can be controlled to some extent using the Motion/sharpness tradeoff on the Settings > Conferences page on the MCU. (Note that this setting applies only to the main video, not the H.239 channel.) If your PowerPoint presentation contains a lot of moving text and text that fades, you can experiment with displaying the presentation in the main video channel.

To do this:

  1. On the IP VCR go to Settings > H.239 and disable H.239 status. Click Apply changes.
  2. Go to Settings > Connections.
  3. For Maximum video size select a setting of Receive CIF, transmit CIF, Receive CIF, transmit 4CIF or Receive 4CIF, transmit 4CIF.
  4. For the Motion/sharpness tradeoff select Favor sharpness or Balanced.
  5. Click Apply changes.
  6. On the MCU that will hold the conference with the presentation to be recorded, go to Settings > H.239 and select Enabled for Display H.239 in normal video channel. Click Apply changes.
  7. Go to Conferences and select the conference with the presentation, then click the Custom layout tab.
  8. Select a custom layout that suits your requirements; for example one with a large pane only (if you just want to record the presentation) or one with a combination of a large frame and smaller frames. Then use pane placement to place the PowerPoint presentation in the big pane (and make appropriate selections for the other panes). Click Update pane placement.
  9. Go to Settings > Conferences and select Favor sharpness for the Motion/sharpness tradeoff. Click Apply changes.

This article applies to the following products:

  • Cisco TelePresence IP VCR 2200 / MSE VCR blade

June 22nd, 2011TAA_KB_79