[LAU] Some ffmpeg/avconv questions

[Rustom Mody]

Ive been trying to capture some screencasts of talks mine with avconv.

many sites seem to recommend using
-vpre lossless_ultrafast

>From the pov of the machine does this consume more CPU or less?

If I set sample-rate to 11000 will ordinary speech be spoilt? What about
5500?

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