Screen recording test

  1. Check which videos play on screen.
  2. Start a screen recording (on a Mac: Cmd+Shift+5, Record Entire Screen).
  3. Play each video that plays for about 5 seconds, then stop the recording.
  4. Watch the recording. Note which videos are black in it.

1. Plain video (control)

2. The browser's own stream player (AES-128)

3a. Clear Key, AES-CTR (cenc) with key header

Checking…

3b. Clear Key, cbcs (Apple's kind)

Checking…