updated from upstream | 05/02/2022 at 10:48

3 files changed, 19 insertions, 6 deletions

diff --git a/yt_dlp/downloader/external.py b/yt_dlp/downloader/external.py
index 17be3c46f..f4fdcf120 100644
--- a/yt_dlp/downloader/external.py
+++ b/yt_dlp/downloader/external.py
@@ -17,11 +17,13 @@ from ..utils import (
     cli_valueless_option,
     cli_bool_option,
     _configuration_args,
+    determine_ext,
     encodeFilename,
     encodeArgument,
     handle_youtubedl_headers,
     check_executable,
     Popen,
+    remove_end,
 )
 
 
@@ -304,7 +306,7 @@ class HttpieFD(ExternalFD):
 
     @classmethod
     def available(cls, path=None):
-        return ExternalFD.available(cls, path or 'http')
+        return super().available(path or 'http')
 
     def _make_cmd(self, tmpfilename, info_dict):
         cmd = ['http', '--download', '--output', tmpfilename, info_dict['url']]
@@ -463,6 +465,15 @@ class FFmpegFD(ExternalFD):
             args += ['-f', 'flv']
         elif ext == 'mp4' and tmpfilename == '-':
             args += ['-f', 'mpegts']
+        elif ext == 'unknown_video':
+            ext = determine_ext(remove_end(tmpfilename, '.part'))
+            if ext == 'unknown_video':
+                self.report_warning(
+                    'The video format is unknown and cannot be downloaded by ffmpeg. '
+                    'Explicitly set the extension in the filename to attempt download in that format')
+            else:
+                self.report_warning(f'The video format is unknown. Trying to download as {ext} according to the filename')
+                args += ['-f', EXT_TO_OUT_FORMATS.get(ext, ext)]
         else:
             args += ['-f', EXT_TO_OUT_FORMATS.get(ext, ext)]
 
diff --git a/yt_dlp/downloader/fragment.py b/yt_dlp/downloader/fragment.py
index d4f112b0f..19c0990d3 100644
--- a/yt_dlp/downloader/fragment.py
+++ b/yt_dlp/downloader/fragment.py
@@ -14,7 +14,7 @@ except ImportError:
 
 from .common import FileDownloader
 from .http import HttpFD
-from ..aes import aes_cbc_decrypt_bytes
+from ..aes import aes_cbc_decrypt_bytes, unpad_pkcs7
 from ..compat import (
     compat_os_name,
     compat_urllib_error,
@@ -366,8 +366,7 @@ class FragmentFD(FileDownloader):
             # not what it decrypts to.
             if self.params.get('test', False):
                 return frag_content
-            decrypted_data = aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv)
-            return decrypted_data[:-decrypted_data[-1]]
+            return unpad_pkcs7(aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv))
 
         return decrypt_fragment
 
diff --git a/yt_dlp/downloader/websocket.py b/yt_dlp/downloader/websocket.py
index 088222046..daac34884 100644
--- a/yt_dlp/downloader/websocket.py
+++ b/yt_dlp/downloader/websocket.py
@@ -5,9 +5,12 @@ import threading
 
 try:
     import websockets
-    has_websockets = True
-except ImportError:
+except (ImportError, SyntaxError):
+    # websockets 3.10 on python 3.6 causes SyntaxError
+    # See https://github.com/yt-dlp/yt-dlp/issues/2633
     has_websockets = False
+else:
+    has_websockets = True
 
 from .common import FileDownloader
 from .external import FFmpegFD