Ive been trying to capture some screencasts of talks mine with avconv.<br><br>many sites seem to recommend using <br>-vpre lossless_ultrafast<br><br>From the pov of the machine does this consume more CPU or less?<br><br>If I set sample-rate to 11000 will ordinary speech be spoilt? What about 5500?<br>

<br>Basically I have an i5 laptop but it starts making a racket if its driven too much.<br>So trying to run it cool<br>