#55 Add aria2c support for DASH (mpd) and HLS (m3u8)

Co-authored-by: Dan <2660574+shirtjs@users.noreply.github.com>
Co-authored-by: pukkandan <pukkandan@gmail.com>

youtube_dlc/downloader/fragment.py

@@ -277,3 +277,24 @@ class FragmentFD(FileDownloader):
             'status': 'finished',
             'elapsed': elapsed,
         })
+
+    def _prepare_external_frag_download(self, ctx):
+        if 'live' not in ctx:
+            ctx['live'] = False
+        if not ctx['live']:
+            total_frags_str = '%d' % ctx['total_frags']
+            ad_frags = ctx.get('ad_frags', 0)
+            if ad_frags:
+                total_frags_str += ' (not including %d ad)' % ad_frags
+        else:
+            total_frags_str = 'unknown (live)'
+        self.to_screen(
+            '[%s] Total fragments: %s' % (self.FD_NAME, total_frags_str))
+
+        tmpfilename = self.temp_name(ctx['filename'])
+
+        # Should be initialized before ytdl file check
+        ctx.update({
+            'tmpfilename': tmpfilename,
+            'fragment_index': 0,
+        })