Add option `--download-sections` to download video partially

[yt-dlp.git] / yt_dlp / downloader / external.py

diff --git a/yt_dlp/downloader/external.py b/yt_dlp/downloader/external.py
index 66eced1b33f6a5b569f94d56b4a1cc4ec9c48c13..3ef7fd4dc1e6b7ab0040209e056100e5e9c4c403 100644 (file)
--- a/yt_dlp/downloader/external.py
+++ b/yt_dlp/downloader/external.py
@@ -384,13 +384,6 @@ def _call_downloader(self, tmpfilename, info_dict):
             # http://trac.ffmpeg.org/ticket/6125#comment:10
             args += ['-seekable', '1' if seekable else '0']
 
-        # start_time = info_dict.get('start_time') or 0
-        # if start_time:
-        #     args += ['-ss', str(start_time)]
-        # end_time = info_dict.get('end_time')
-        # if end_time:
-        #     args += ['-t', str(end_time - start_time)]
-
         http_headers = None
         if info_dict.get('http_headers'):
             youtubedl_headers = handle_youtubedl_headers(info_dict['http_headers'])
@@ -451,15 +444,21 @@ def _call_downloader(self, tmpfilename, info_dict):
             elif isinstance(conn, str):
                 args += ['-rtmp_conn', conn]
 
+        start_time, end_time = info_dict.get('section_start') or 0, info_dict.get('section_end')
+
         for i, url in enumerate(urls):
-            # We need to specify headers for each http input stream
-            # otherwise, it will only be applied to the first.
-            # https://github.com/yt-dlp/yt-dlp/issues/2696
             if http_headers is not None and re.match(r'^https?://', url):
                 args += http_headers
+            if start_time:
+                args += ['-ss', str(start_time)]
+            if end_time:
+                args += ['-t', str(end_time - start_time)]
+
             args += self._configuration_args((f'_i{i + 1}', '_i')) + ['-i', url]
 
-        args += ['-c', 'copy']
+        if not (start_time or end_time) or not self.params.get('force_keyframes_at_cuts'):
+            args += ['-c', 'copy']
+
         if info_dict.get('requested_formats') or protocol == 'http_dash_segments':
             for (i, fmt) in enumerate(info_dict.get('requested_formats') or [info_dict]):
                 stream_number = fmt.get('manifest_stream_number', 0)