Al-Jazeera showed a portion of the tape with the newscaster saying that al-Zawahri cast doubt on the possibility of change through peaceful demonstrations.
In the brief clip aired without audio, al-Zawahri appears sitting before a plain backdrop with an automatic weapon next to him. He is wearing a white turban and black and white robes. At one point, he glanced to the left at something off-camera.
The station said it would air the tape later Friday night.