Merge remote-tracking branch 'github/yt-live-from-start-range' into yt-live-from-start-range

yt_dlp/YoutubeDL.py

@@ -27,7 +27,12 @@ from .cache import Cache
 from .compat import functools, urllib  # isort: split
 from .compat import compat_os_name, compat_shlex_quote, urllib_req_to_req
 from .cookies import LenientSimpleCookie, load_cookies
-from .downloader import FFmpegFD, DashSegmentsFD, get_suitable_downloader, shorten_protocol_name
+from .downloader import (
+    DashSegmentsFD,
+    FFmpegFD,
+    get_suitable_downloader,
+    shorten_protocol_name,
+)
 from .downloader.rtmp import rtmpdump_version
 from .extractor import gen_extractor_classes, get_info_extractor
 from .extractor.common import UnsupportedURLIE
@@ -3281,7 +3286,7 @@ class YoutubeDL:
                 fd, success = None, True
                 if info_dict.get('protocol') or info_dict.get('url'):
                     fd = get_suitable_downloader(info_dict, self.params, to_stdout=temp_filename == '-')
-                    if not (fd is FFmpegFD or fd is DashSegmentsFD) and 'no-direct-merge' not in self.params['compat_opts'] and (
+                    if fd not in [FFmpegFD, DashSegmentsFD] and 'no-direct-merge' not in self.params['compat_opts'] and (
                             info_dict.get('section_start') or info_dict.get('section_end')):
                         msg = ('This format cannot be partially downloaded' if FFmpegFD.available()
                                else 'You have requested downloading the video partially, but ffmpeg is not installed')

yt_dlp/options.py

@@ -416,13 +416,13 @@ def create_parser():
     general.add_option(
         '--live-from-start',
         action='store_true', dest='live_from_start',
-        help=('Download livestreams from the start. Currently only supported for YouTube (Experimental).',
+        help=('Download livestreams from the start. Currently only supported for YouTube (Experimental). '
-              'Time ranges can be specified using --download-sections to download only a part of the stream.',
+              'Time ranges can be specified using --download-sections to download only a part of the stream. '
-              'Negative values are allowed for specifying a relative previous time, using the # syntax',
+              'Negative values are allowed for specifying a relative previous time, using the # syntax '
-              'e.g. --download-sections "#-24hours - 0" (download last 24 hours),',
+              'e.g. --download-sections "#-24hours - 0" (download last 24 hours), '
-              'e.g. --download-sections "#-1h - 30m" (download from 1 hour ago until the next 30 minutes),',
+              'e.g. --download-sections "#-1h - 30m" (download from 1 hour ago until the next 30 minutes), '
-              'e.g. --download-sections "#-3days - -2days" (download from 3 days ago until 2 days ago).',
+              'e.g. --download-sections "#-3days - -2days" (download from 3 days ago until 2 days ago). '
-              'It is also possible to specify an exact unix timestamp range, using the * syntax',
+              'It is also possible to specify an exact unix timestamp range, using the * syntax, '
               'e.g. --download-sections "*1672531200 - 1672549200" (download between those two timestamps)'))
     general.add_option(
         '--no-live-from-start',