[cleanup] Refactor ffmpeg convertors

1 files changed, 20 insertions, 9 deletions

diff --git a/yt_dlp/options.py b/yt_dlp/options.py
index 812bee572..c72a7d5d0 100644
--- a/yt_dlp/options.py
+++ b/yt_dlp/options.py
@@ -5,7 +5,6 @@ import optparse
 import re
 import sys
 
-from .downloader.external import list_external_downloaders
 from .compat import (
     compat_expanduser,
     compat_get_terminal_size,
@@ -18,11 +17,18 @@ from .utils import (
     get_executable_path,
     OUTTMPL_TYPES,
     preferredencoding,
-    REMUX_EXTENSIONS,
     write_string,
 )
 from .version import __version__
 
+from .downloader.external import list_external_downloaders
+from .postprocessor.ffmpeg import (
+    FFmpegExtractAudioPP,
+    FFmpegSubtitlesConvertorPP,
+    FFmpegThumbnailsConvertorPP,
+    FFmpegVideoRemuxerPP,
+)
+
 
 def _hide_login_info(opts):
     PRIVATE_OPTS = set(['-p', '--password', '-u', '--username', '--video-password', '--ap-password', '--ap-username'])
@@ -1123,7 +1129,9 @@ def parseOpts(overrideArguments=None):
         help='Convert video files to audio-only files (requires ffmpeg and ffprobe)')
     postproc.add_option(
         '--audio-format', metavar='FORMAT', dest='audioformat', default='best',
-        help='Specify audio format: "best", "aac", "flac", "mp3", "m4a", "opus", "vorbis", or "wav"; "%default" by default; No effect without -x')
+        help=(
+            'Specify audio format to convert the audio to when -x is used. Currently supported formats are: '
+            'best (default) or one of %s' % '|'.join(FFmpegExtractAudioPP.SUPPORTED_EXTS)))
     postproc.add_option(
         '--audio-quality', metavar='QUALITY',
         dest='audioquality', default='5',
@@ -1134,15 +1142,14 @@ def parseOpts(overrideArguments=None):
         help=(
             'Remux the video into another container if necessary (currently supported: %s). '
             'If target container does not support the video/audio codec, remuxing will fail. '
-            'You can specify multiple rules; eg. "aac>m4a/mov>mp4/mkv" will remux aac to m4a, mov to mp4 '
-            'and anything else to mkv.' % '|'.join(REMUX_EXTENSIONS)))
+            'You can specify multiple rules; Eg. "aac>m4a/mov>mp4/mkv" will remux aac to m4a, mov to mp4 '
+            'and anything else to mkv.' % '|'.join(FFmpegVideoRemuxerPP.SUPPORTED_EXTS)))
     postproc.add_option(
         '--recode-video',
         metavar='FORMAT', dest='recodevideo', default=None,
         help=(
             'Re-encode the video into another format if re-encoding is necessary. '
-            'You can specify multiple rules similar to --remux-video. '
-            'The supported formats are also the same as --remux-video'))
+            'The syntax and supported formats are the same as --remux-video'))
     postproc.add_option(
         '--postprocessor-args', '--ppa',
         metavar='NAME:ARGS', dest='postprocessor_args', default={}, type='str',
@@ -1250,11 +1257,15 @@ def parseOpts(overrideArguments=None):
     postproc.add_option(
         '--convert-subs', '--convert-sub', '--convert-subtitles',
         metavar='FORMAT', dest='convertsubtitles', default=None,
-        help='Convert the subtitles to another format (currently supported: srt|ass|vtt|lrc) (Alias: --convert-subtitles)')
+        help=(
+            'Convert the subtitles to another format (currently supported: %s) '
+            '(Alias: --convert-subtitles)' % '|'.join(FFmpegSubtitlesConvertorPP.SUPPORTED_EXTS)))
     postproc.add_option(
         '--convert-thumbnails',
         metavar='FORMAT', dest='convertthumbnails', default=None,
-        help='Convert the thumbnails to another format (currently supported: jpg, png)')
+        help=(
+            'Convert the thumbnails to another format '
+            '(currently supported: %s) ' % '|'.join(FFmpegThumbnailsConvertorPP.SUPPORTED_EXTS)))
     postproc.add_option(
         '--split-chapters', '--split-tracks',
         dest='split_chapters', action='store_true', default=False,