Parallel convert to Lightworks

lightworks_process.vcf

VirtualDub.Open(VirtualDub.params[0],"",0);
VirtualDub.audio.SetSource(0);
VirtualDub.audio.SetMode(0);
VirtualDub.audio.SetInterleave(1,500,1,0,0);
VirtualDub.audio.SetClipMode(1,1);
VirtualDub.audio.SetConversion(0,0,0,0,0);
VirtualDub.audio.SetVolume();
VirtualDub.audio.SetCompression();
VirtualDub.audio.EnableFilterGraph(0);
VirtualDub.video.SetInputFormat(0);
VirtualDub.video.SetOutputFormat(7);
VirtualDub.video.SetMode(3);
VirtualDub.video.SetSmartRendering(0);
VirtualDub.video.SetPreserveEmptyFrames(0);
VirtualDub.video.SetFrameRate2(0,0,1);
VirtualDub.video.SetIVTC(0, 0, 0, 0);
VirtualDub.video.SetCompression(0x3130376d,0,10000,0);
VirtualDub.video.SetCompData(56,"kNlSAgAAAABgfVECAAAAAE15IExpdHRsZSBQb255IEZyaWVuZHNoaXAgaXMgTWFnaWMgMXgwMSA=");
VirtualDub.video.filters.Clear();
VirtualDub.audio.filters.Clear();
VirtualDub.SaveAVI(VirtualDub.params[1]);
VirtualDub.Close();

process_for_lightworks.py

from multiprocessing import Pool
import os
import shutil
from subprocess import call

AVIDEMUX = 'C:/Program Files (x86)/Avidemux 2.5/avidemux2_cli.exe'
VIRTUALDUB = 'C:/Program Files/VirtualDub/vdub64.exe'

def convert_file(f):
    (n, x) = os.path.splitext(f)
    favi = ''.join([n, '.avi'])
    orig = os.path.join(os.getcwd(), 'orig', f)
    inter = os.path.join(os.getcwd(), 'inter', favi)
    final = os.path.join(os.getcwd(), 'lightworks', favi)
    
    # from orig to inter, avidemux to change from mkv to avi
    call([AVIDEMUX, '--force-alt-h264', '--load', orig, '--save', inter, '--output-format AVI', '--quit'])
    # from inter to final, virtualdub to reencode video to m702 (Matrox MPEG-2 I-frame HD)
    call([VIRTUALDUB, '/i', 'lightworks_process.vcf', inter, final])

if __name__ == '__main__':
    p = Pool()
    os.mkdir('inter')
    p.map(convert_file, os.listdir('orig'))
    shutil.rmtree('inter')