I also modified yt_dlp. But I do not remember what I changed. Have fun

yt_dlp/postprocessor/__init__.py

@@ -0,0 +1,47 @@
+# flake8: noqa: F401
+
+from .common import PostProcessor
+from .embedthumbnail import EmbedThumbnailPP
+from .exec import ExecAfterDownloadPP, ExecPP
+from .ffmpeg import (
+    FFmpegConcatPP,
+    FFmpegCopyStreamPP,
+    FFmpegEmbedSubtitlePP,
+    FFmpegExtractAudioPP,
+    FFmpegFixupDuplicateMoovPP,
+    FFmpegFixupDurationPP,
+    FFmpegFixupM3u8PP,
+    FFmpegFixupM4aPP,
+    FFmpegFixupStretchedPP,
+    FFmpegFixupTimestampPP,
+    FFmpegMergerPP,
+    FFmpegMetadataPP,
+    FFmpegPostProcessor,
+    FFmpegSplitChaptersPP,
+    FFmpegSubtitlesConvertorPP,
+    FFmpegThumbnailsConvertorPP,
+    FFmpegVideoConvertorPP,
+    FFmpegVideoRemuxerPP,
+)
+from .metadataparser import (
+    MetadataFromFieldPP,
+    MetadataFromTitlePP,
+    MetadataParserPP,
+)
+from .modify_chapters import ModifyChaptersPP
+from .movefilesafterdownload import MoveFilesAfterDownloadPP
+from .sponskrub import SponSkrubPP
+from .sponsorblock import SponsorBlockPP
+from .xattrpp import XAttrMetadataPP
+from ..plugins import load_plugins
+
+_PLUGIN_CLASSES = load_plugins('postprocessor', 'PP')
+
+
+def get_postprocessor(key):
+    return globals()[key + 'PP']
+
+
+globals().update(_PLUGIN_CLASSES)
+__all__ = [name for name in globals().keys() if name.endswith('PP')]
+__all__.extend(('PostProcessor', 'FFmpegPostProcessor'))