How to: Post-Processing Options:
-x, --extract-audio             Convert video files to audio-only files
                                    (requires ffmpeg and ffprobe)
    --audio-format FORMAT           Format to convert the audio to when -x is
                                    used. (currently supported: best (default),
                                    aac, alac, flac, m4a, mp3, opus, vorbis,
                                    wav). You can specify multiple rules using
                                    similar syntax as --remux-video
    --audio-quality QUALITY         Specify ffmpeg audio quality to use when
                                    converting the audio with -x. Insert a value
                                    between 0 (best) and 10 (worst) for VBR or a
                                    specific bitrate like 128K (default 5)
    --remux-video FORMAT            Remux the video into another container if
                                    necessary (currently supported: avi, flv,
                                    gif, mkv, mov, mp4, webm, aac, aiff, alac,
                                    flac, m4a, mka, mp3, ogg, opus, vorbis,
                                    wav). If the target container does not
                                    support the video/audio codec, remuxing will
                                    fail. You can specify multiple rules; e.g.
                                    "aac>m4a/mov>mp4/mkv" will remux aac to m4a,
                                    mov to mp4 and anything else to mkv
    --recode-video FORMAT           Re-encode the video into another format if
                                    necessary. The syntax and supported formats
                                    are the same as --remux-video
    --postprocessor-args NAME:ARGS  Give these arguments to the postprocessors.
                                    Specify the postprocessor/executable name
                                    and the arguments separated by a colon ":"
                                    to give the argument to the specified
                                    postprocessor/executable. Supported PP are:
                                    Merger, ModifyChapters, SplitChapters,
                                    ExtractAudio, VideoRemuxer, VideoConvertor,
                                    Metadata, EmbedSubtitle, EmbedThumbnail,
                                    SubtitlesConvertor, ThumbnailsConvertor,
                                    FixupStretched, FixupM4a, FixupM3u8,
                                    FixupTimestamp and FixupDuration. The
                                    supported executables are: AtomicParsley,
                                    FFmpeg and FFprobe. You can also specify
                                    "PP+EXE:ARGS" to give the arguments to the
                                    specified executable only when being used by
                                    the specified postprocessor. Additionally,
                                    for ffmpeg/ffprobe, "_i"/"_o" can be
                                    appended to the prefix optionally followed
                                    by a number to pass the argument before the
                                    specified input/output file, e.g. --ppa
                                    "Merger+ffmpeg_i1:-v quiet". You can use
                                    this option multiple times to give different
                                    arguments to different postprocessors.
                                    (Alias: --ppa)
    -k, --keep-video                Keep the intermediate video file on disk
                                    after post-processing
    --no-keep-video                 Delete the intermediate video file after
                                    post-processing (default)
    --post-overwrites               Overwrite post-processed files (default)
    --no-post-overwrites            Do not overwrite post-processed files
    --embed-subs                    Embed subtitles in the video (only for mp4,
                                    webm and mkv videos)
    --no-embed-subs                 Do not embed subtitles (default)
    --embed-thumbnail               Embed thumbnail in the video as cover art
    --no-embed-thumbnail            Do not embed thumbnail (default)
    --embed-metadata                Embed metadata to the video file. Also
                                    embeds chapters/infojson if present unless
                                    --no-embed-chapters/--no-embed-info-json are
                                    used (Alias: --add-metadata)
    --no-embed-metadata             Do not add metadata to file (default)
                                    (Alias: --no-add-metadata)
    --embed-chapters                Add chapter markers to the video file
                                    (Alias: --add-chapters)
    --no-embed-chapters             Do not add chapter marke