Misc fixes - See desc

* Remove unnecessary uses of _list_from_options_callback
* Fix download tests - Bug from 6e84b21559
* Rename ExecAfterDownloadPP to ExecPP and refactor its tests
* Ensure _write_ytdl_file closes file handle on error - Potential fix for #517

test/test_download.py

@@ -147,7 +147,7 @@ def _hook(status):
         expect_warnings(ydl, test_case.get('expected_warnings', []))
 
         def get_tc_filename(tc):
-            return ydl.prepare_filename(tc.get('info_dict', {}))
+            return ydl.prepare_filename(dict(tc.get('info_dict', {})))
 
         res_dict = None
 

test/test_postprocessors.py

@@ -11,7 +11,7 @@
 from yt_dlp import YoutubeDL
 from yt_dlp.compat import compat_shlex_quote
 from yt_dlp.postprocessor import (
-    ExecAfterDownloadPP,
+    ExecPP,
     FFmpegThumbnailsConvertorPP,
     MetadataFromFieldPP,
     MetadataParserPP,
@@ -59,12 +59,12 @@ def test_escaping(self):
             os.remove(file.format(out))
 
 
-class TestExecAfterDownload(unittest.TestCase):
+class TestExec(unittest.TestCase):
     def test_parse_cmd(self):
-        pp = ExecAfterDownloadPP(YoutubeDL(), '')
+        pp = ExecPP(YoutubeDL(), '')
         info = {'filepath': 'file name'}
-        quoted_filepath = compat_shlex_quote(info['filepath'])
+        cmd = 'echo %s' % compat_shlex_quote(info['filepath'])
 
-        self.assertEqual(pp.parse_cmd('echo', info), 'echo %s' % quoted_filepath)
-        self.assertEqual(pp.parse_cmd('echo.{}', info), 'echo.%s' % quoted_filepath)
-        self.assertEqual(pp.parse_cmd('echo "%(filepath)s"', info), 'echo "%s"' % info['filepath'])
+        self.assertEqual(pp.parse_cmd('echo', info), cmd)
+        self.assertEqual(pp.parse_cmd('echo {}', info), cmd)
+        self.assertEqual(pp.parse_cmd('echo %(filepath)q', info), cmd)

yt_dlp/YoutubeDL.py

@@ -2339,6 +2339,7 @@ def process_subtitles(self, video_id, normal_subtitles, automatic_captions):
             requested_langs = ['en']
         else:
             requested_langs = [list(all_sub_langs)[0]]
+        if requested_langs:
             self.write_debug('Downloading subtitles: %s' % ', '.join(requested_langs))
 
         formats_query = self.params.get('subtitlesformat', 'best')
@@ -3256,13 +3257,13 @@ def python_implementation():
         from .postprocessor.embedthumbnail import has_mutagen
         from .cookies import SQLITE_AVAILABLE, KEYRING_AVAILABLE
 
-        lib_str = ', '.join(filter(None, (
+        lib_str = ', '.join(sorted(filter(None, (
             can_decrypt_frag and 'pycryptodome',
             has_websockets and 'websockets',
             has_mutagen and 'mutagen',
             SQLITE_AVAILABLE and 'sqlite',
             KEYRING_AVAILABLE and 'keyring',
-        ))) or 'none'
+        )))) or 'none'
         self._write_string('[debug] Optional libraries: %s\n' % lib_str)
 
         proxy_map = {}

yt_dlp/__init__.py

@@ -332,7 +332,8 @@ def validate_outtmpl(tmpl, msg):
 
     for k, tmpl in opts.outtmpl.items():
         validate_outtmpl(tmpl, '%s output template' % k)
-    for tmpl in opts.forceprint:
+    opts.forceprint = opts.forceprint or []
+    for tmpl in opts.forceprint or []:
         validate_outtmpl(tmpl, 'print template')
 
     if opts.extractaudio and not opts.keepvideo and opts.format is None:
@@ -445,7 +446,7 @@ def report_conflict(arg1, arg2):
     # Must be after all other before_dl
     if opts.exec_before_dl_cmd:
         postprocessors.append({
-            'key': 'ExecAfterDownload',
+            'key': 'Exec',
             'exec_cmd': opts.exec_before_dl_cmd,
             'when': 'before_dl'
         })
@@ -516,10 +517,10 @@ def report_conflict(arg1, arg2):
     # XAttrMetadataPP should be run after post-processors that may change file contents
     if opts.xattrs:
         postprocessors.append({'key': 'XAttrMetadata'})
-    # ExecAfterDownload must be the last PP
+    # Exec must be the last PP
     if opts.exec_cmd:
         postprocessors.append({
-            'key': 'ExecAfterDownload',
+            'key': 'Exec',
             'exec_cmd': opts.exec_cmd,
             # Run this only after the files have been moved to their final locations
             'when': 'after_move'

yt_dlp/downloader/fragment.py

@@ -105,6 +105,7 @@ def _read_ytdl_file(self, ctx):
 
     def _write_ytdl_file(self, ctx):
         frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w')
+        try:
             downloader = {
                 'current_fragment': {
                     'index': ctx['fragment_index'],
@@ -115,6 +116,7 @@ def _write_ytdl_file(self, ctx):
             if ctx.get('fragment_count') is not None:
                 downloader['fragment_count'] = ctx['fragment_count']
             frag_index_stream.write(json.dumps({'downloader': downloader}))
+        finally:
             frag_index_stream.close()
 
     def _download_fragment(self, ctx, frag_url, info_dict, headers=None, request_data=None):

yt_dlp/options.py

@@ -23,7 +23,7 @@
 from .version import __version__
 
 from .downloader.external import list_external_downloaders
-from .postprocessor.ffmpeg import (
+from .postprocessor import (
     FFmpegExtractAudioPP,
     FFmpegSubtitlesConvertorPP,
     FFmpegThumbnailsConvertorPP,
@@ -803,9 +803,8 @@ def _dict_from_options_callback(
         action='store_true', dest='skip_download', default=False,
         help='Do not download the video but write all related files (Alias: --no-download)')
     verbosity.add_option(
-        '-O', '--print', metavar='TEMPLATE',
-        action='callback', dest='forceprint', type='str', default=[],
-        callback=_list_from_options_callback, callback_kwargs={'delim': None},
+        '-O', '--print',
+        metavar='TEMPLATE', action='append', dest='forceprint',
         help=(
             'Quiet, but print the given fields for each video. Simulate unless --no-simulate is used. '
             'Either a field name or same syntax as the output template can be used'))
@@ -1276,8 +1275,7 @@ def _dict_from_options_callback(
         help='Location of the ffmpeg binary; either the path to the binary or its containing directory')
     postproc.add_option(
         '--exec', metavar='CMD',
-        action='callback', dest='exec_cmd', default=[], type='str',
-        callback=_list_from_options_callback, callback_kwargs={'delim': None},
+        action='append', dest='exec_cmd',
         help=(
             'Execute a command on the file after downloading and post-processing. '
             'Same syntax as the output template can be used to pass any field as arguments to the command. '
@@ -1290,8 +1288,7 @@ def _dict_from_options_callback(
         help='Remove any previously defined --exec')
     postproc.add_option(
         '--exec-before-download', metavar='CMD',
-        action='callback', dest='exec_before_dl_cmd', default=[], type='str',
-        callback=_list_from_options_callback, callback_kwargs={'delim': None},
+        action='append', dest='exec_before_dl_cmd',
         help=(
             'Execute a command before the actual download. '
             'The syntax is the same as --exec but "filepath" is not available. '

yt_dlp/postprocessor/__init__.py

@@ -19,7 +19,7 @@
     FFmpegVideoRemuxerPP,
 )
 from .xattrpp import XAttrMetadataPP
-from .execafterdownload import ExecAfterDownloadPP
+from .exec import ExecPP, ExecAfterDownloadPP
 from .metadataparser import (
     MetadataFromFieldPP,
     MetadataFromTitlePP,
@@ -36,6 +36,7 @@ def get_postprocessor(key):
 __all__ = [
     'FFmpegPostProcessor',
     'EmbedThumbnailPP',
+    'ExecPP',
     'ExecAfterDownloadPP',
     'FFmpegEmbedSubtitlePP',
     'FFmpegExtractAudioPP',

yt_dlp/postprocessor/exec.py

@@ -11,16 +11,12 @@
 )
 
 
-class ExecAfterDownloadPP(PostProcessor):
+class ExecPP(PostProcessor):
 
     def __init__(self, downloader, exec_cmd):
-        super(ExecAfterDownloadPP, self).__init__(downloader)
+        PostProcessor.__init__(self, downloader)
         self.exec_cmd = variadic(exec_cmd)
 
-    @classmethod
-    def pp_key(cls):
-        return 'Exec'
-
     def parse_cmd(self, cmd, info):
         tmpl, tmpl_dict = self._downloader.prepare_outtmpl(cmd, info)
         if tmpl_dict:  # if there are no replacements, tmpl_dict = {}
@@ -40,3 +36,7 @@ def run(self, info):
             if retCode != 0:
                 raise PostProcessingError('Command returned error code %d' % retCode)
         return [], info
+
+
+class ExecAfterDownloadPP(ExecPP):  # for backward compatibility
+    pass