Audio Scraper is a simple console utility that saves the audio from a video file for use in listening to in iTunes. It's totally a stupid mac thing, so sorry. This is an example of using the AVFoundation API.

Audioscrape:

Default Mode:
    audioscrape source.m4v dest.m4a

    In default mode, just treat the first 2 args like source video and dest audio.

Batch Mode:
    audioscrape -b -e <num> -o <list of sources>  

    -b : enable batch mode

    Batch mode treats all the arguments like source .m4v files
    Destination filenames are inferred from each source path.

    -o : overwrite destination files

    By default audioscrape will not overwrite an existing file.

    -e <exporters> : define the number of exporters to use

    Each exporter seems to spawn about 8 threads each. The number of exporters is 32 by default.

Bugs:

Large values to -e will cause segfaults, presumably due to the large number of threads created. Each exporter
seems to create about 8 threads each.