[downloader] Remove various unneeded assignments and imports

youtube_dl/downloader/f4m.py

@@ -15,7 +15,6 @@ from ..compat import (
 from ..utils import (
     struct_pack,
     struct_unpack,
-    format_bytes,
     encodeFilename,
     sanitize_open,
     xpath_text,
@@ -334,10 +333,8 @@ class F4mFD(FileDownloader):
 
             if s['status'] == 'finished':
                 progress = self.calc_percent(state['frag_index'], total_frags)
-                byte_counter = state['downloaded_bytes']
             else:
                 frag_downloaded_bytes = s['downloaded_bytes']
-                byte_counter = state['downloaded_bytes'] + frag_downloaded_bytes
                 frag_progress = self.calc_percent(frag_downloaded_bytes,
                                                   frag_total_bytes)
                 progress = self.calc_percent(state['frag_index'], total_frags)

youtube_dl/downloader/http.py

@@ -15,7 +15,6 @@ from ..utils import (
     ContentTooShortError,
     encodeFilename,
     sanitize_open,
-    format_bytes,
 )
 
 
@@ -137,7 +136,6 @@ class HttpFD(FileDownloader):
                 self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
                 return False
 
-        data_len_str = format_bytes(data_len)
         byte_counter = 0 + resume_len
         block_size = self.params.get('buffersize', 1024)
         start = time.time()
@@ -196,9 +194,8 @@ class HttpFD(FileDownloader):
             # Progress message
             speed = self.calc_speed(start, now, byte_counter - resume_len)
             if data_len is None:
-                eta = percent = None
+                eta = None
             else:
-                percent = self.calc_percent(byte_counter, data_len)
                 eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
 
             self._hook_progress({

youtube_dl/downloader/rtmp.py

@@ -11,7 +11,6 @@ from ..compat import compat_str
 from ..utils import (
     check_executable,
     encodeFilename,
-    format_bytes,
     get_exe_version,
 )