Added the Trim command line arg

When the --trim command line arg is used, the file will download into a different folder called "trimmed_video"

youtube_dl/YoutubeDL.py

@@ -1950,6 +1950,10 @@ class YoutubeDL(object):
         if filename is None:
             return
 
+        # ETHAN
+        if self.params.get('usetrim', False):
+            filename = "/trimmed_video/" + filename
+
         def ensure_dir_exists(path):
             try:
                 dn = os.path.dirname(path)

youtube_dl/__init__.py

@@ -432,6 +432,7 @@ def _real_main(argv=None):
         'geo_bypass': opts.geo_bypass,
         'geo_bypass_country': opts.geo_bypass_country,
         'geo_bypass_ip_block': opts.geo_bypass_ip_block,
+        'usetrim': opts.usetrim,        
         # just for deprecation check
         'autonumber': opts.autonumber if opts.autonumber is True else None,
         'usetitle': opts.usetitle if opts.usetitle is True else None,

youtube_dl/options.py

@@ -713,6 +713,10 @@ def parseOpts(overrideArguments=None):
         '-t', '--title',
         action='store_true', dest='usetitle', default=False,
         help=optparse.SUPPRESS_HELP)
+    filesystem.add_option(
+        '--trim',
+        action='store_true', dest='usetrim', default=False,
+        help=optparse.SUPPRESS_HELP)
     filesystem.add_option(
         '-l', '--literal', default=False,
         action='store_true', dest='usetitle',