diff --git a/m3u8downloader/main.py b/m3u8downloader/main.py
index 653994975db74145c2f3ed202bd199d13df4a58d..973480d4acad8ed3533132da7884d25c20f29a70 100644
--- a/m3u8downloader/main.py
+++ b/m3u8downloader/main.py
@@ -111,7 +111,7 @@ def drop_http_link_in_m3u8_file(local_m3u8_filename):
     with open(local_m3u8_filename, 'r') as f:
         content = f.read()
     if 'http' not in content:
-        logger.info("media playlist m3u8 file doesn't contain http link")
+        logger.debug("media playlist m3u8 file doesn't contain http link")
         return
     with open(local_m3u8_filename, 'w') as f:
         for line in content.split('\n'):
@@ -124,19 +124,19 @@ def drop_http_link_in_m3u8_file(local_m3u8_filename):
             if line.startswith('http'):
                 f.write(http_line_to_relpath_line(line))
                 f.write('\n')
-    logger.info("updated media playlist m3u8 file: %s", local_m3u8_filename)
+    logger.info("http links modified in m3u8 file: %s", local_m3u8_filename)
 
 
 class M3u8Downloader:
     def __init__(self, url, output_filename, tempdir="."):
         self.start_url = url
-        logger.info("output_filename=%s", output_filename)
+        logger.debug("output_filename=%s", output_filename)
         self.output_filename = get_fullpath(output_filename)
         self.tempdir = get_fullpath(
             os.path.join(tempdir, get_basename(output_filename)))
         try:
             os.makedirs(self.tempdir, exist_ok=True)
-            logger.info("using temp dir at: %s", self.tempdir)
+            logger.debug("using temp dir at: %s", self.tempdir)
         except IOError as _:
             logger.exception("create tempdir failed for: %s", self.tempdir)
             raise
@@ -205,7 +205,7 @@ class M3u8Downloader:
         uri = mo.group(1)
         key_url = urljoin(url, uri)
         local_key_file = self.mirror_url_resource(key_url)
-        logger.info("key downloaded at: %s", local_key_file)
+        logger.debug("key downloaded at: %s", local_key_file)
 
     def download_fragment(self, url):
         """download a video fragment.
@@ -213,7 +213,7 @@ class M3u8Downloader:
         """
         fragment_full_name = self.mirror_url_resource(url)
         if fragment_full_name:
-            logger.info("fragment created at: %s", fragment_full_name)
+            logger.debug("fragment created at: %s", fragment_full_name)
         return (url, fragment_full_name)
 
     def fragment_downloaded(self, result):
@@ -294,7 +294,7 @@ class M3u8Downloader:
                 replace_on_next_line = False
             if target_media_playlist is None:
                 target_media_playlist = line
-        logger.info("choose resolution=%s uri=%s",
+        logger.info("chose resolution=%s uri=%s",
                     last_resolution, target_media_playlist)
         self.process_media_playlist(urljoin(url, target_media_playlist))
 
diff --git a/operational b/operational
index 53df5042ec4a4fbbec5ac4d364e01d761d4e43d4..a69a67c140e0a5328338cb50e1865e7c664acfd5 100644
--- a/operational
+++ b/operational
@@ -1,6 +1,6 @@
 * COMMENT -*- mode: org -*-
 #+Date: 2019-03-02
-Time-stamp: <2019-03-03>
+Time-stamp: <2019-03-06>
 #+STARTUP: content
 * notes                                                               :entry:
 * later                                                               :entry:
@@ -39,6 +39,19 @@ to handle it on ryzen5.
 
 * current                                                             :entry:
 ** 
+** 2019-03-03 add progress tracking log.
+do a commit before I add this.
+
+- 2019-03-06 expected log:
+  120 fragments
+  25%, 30 fragments fetched.
+  100%, 120 fragments fetched.
+
+  moved some info log to debug log.
+  how to add progress log.
+  pool.join() is blocking.
+
+* done                                                                :entry:
 ** 2019-03-03 generate mp4 for audio sequence fail.
 probably because of png ext.
 https://m3u.x8sinablog.net/20180627/1530068509/vts/audio000.png
@@ -64,10 +77,6 @@ it's aac audio.
 
   it works.
 
-** 2019-03-03 add progress tracking log.
-do a commit before I add this.
-
-* done                                                                :entry:
 ** 2019-03-02 my plan
 - target temp dir:
   subdir and filename same as original path.