This morning, five.
For a long time we had the pictures but no sound.
We got sound if we played the disc through the DVD player rather than the computer, but it was formatted for the computer so looked and sounded terrible.
We tried using the iPod plugs, to no avail.
We got a hint of sound if the plug was only half in.
The fifth teacher solved the problem. Use a different computer programme...
Having spent all morning locating (or rather, not locating) the original film and then working out how to burn the video onto disc again (husband did it before: how am I supposed to know whether to use PAL or NTSC formatting? I just want it to play!) it was a relief when we finally worked it out. By then all the children were in the hall and 'quietly chatting' amongst themselves. Talk about stress!
I don't know how teachers work and remain sane. My 15 minute presentation drained me completely, whereas they stand up in front of classes for 6 hours a day, five days a week. I stumbled over words, I said the wrong things, I probably used words that are far too complicated, I forgot important facts. It is a good job I am not in charge of anyone's education!
I am in utter awe of teachers... however many it takes to get sound from a computer!