and ajust audio settings, when capture audio is selected you will see:
1. Choose how many channel’s your sound source will be recorded. If
your sound source is mono choose mono it will save many disk space. Choose
Stereo only if you want a great sound quality.
2. Adjust sample rate. This describes how many times per second to take a snapshot of the audio. The human ear can perceive sounds up to about 17,000 cycles per second, or 17 Khz. So to reproduce frequencies up to 10Khz, you must choose a sample rate of at least 20Khz. Increasing sample rate you are increasing sound quality. ( 44 100 Hz is used by CD-AUDIO).
3. Sound quality. To select the audio digitizing quality 16 bit’s or 8 bit’s (16 bit’s is used by CD-AUDIO).
If your movie do not have sound, select no audio this will save many filesize.