Fixed OSError 6 when packaging with --windowed.

ffmpeg.py

@@ -347,4 +347,4 @@ def convert_audio(file, dest, rate, vol, codec="pcm_s16le"):
     # cmd = cmd.format(ff=find(), i=file, codec=codec, rate=rate, vol=vol / 100, dest=dest)
     cmd = (find(), '-y', '-i', file, '-map_metadata', '-1', '-ac', '1', '-aq', '100',
            '-acodec', codec, '-ar', rate, '-af', 'volume={vol}'.format(vol=vol/100), '{dest}.wav'.format(dest=dest))
-    return subprocess.check_output(cmd, stderr=subprocess.STDOUT)
+    return subprocess.check_output(cmd, stdin=subprocess.PIPE, stderr=subprocess.PIPE)

seven_zip.py

@@ -16,7 +16,7 @@
 # along with pyjam.  If not, see <http://www.gnu.org/licenses/>.
 
 # An interface to 7zip
-from subprocess import call
+import subprocess
 
 try:
     from shutil import which
@@ -30,4 +30,4 @@ def find():
 
 def extract_single(archive, file, dest):
     cmd = "{bin} e -y {archive} -o{dest} {file} -r".format(bin=find(), archive=archive, dest=dest, file=file)
-    call(cmd)
+    subprocess.call(cmd, stdin=subprocess.PIPE, stderr=subprocess.PIPE, stdout=subprocess.PIPE)