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tracks

VT = VideoTrack module-attribute

AT = AudioTrack module-attribute

ST = SubTrack module-attribute

MkvTrack = Premux module-attribute

_track

Source code in muxtools/muxing/tracks.py 
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class _track:
    file: Path
    type: TrackType
    default: bool
    forced: bool
    name: str
    lang: str
    delay: int
    args: list[str] | None

    def __init__(
        self,
        file: PathLike,
        type: str | int | TrackType,
        name: str = "",
        lang: str = "",
        default: bool = True,
        forced: bool = False,
        delay: int = 0,
        args: list[str] | None = None,
    ) -> None:
        from .muxfiles import MuxingFile

        """
        :param file:        Filepath as string or Path object
        :param type:        TrackType enum, or int or string (1 = 'video', 2 = 'audio', 3 = 'sub')
        :param name:        The track name in the resulting mkv file
        :param lang:        The language tag for the track
        :param default:     Default flag
        :param forced:      Forced flag
        :param delay:       Container delay of track in ms
        """
        self.file = ensure_path_exists(file, self)
        self.default = default
        self.forced = forced
        self.name = name
        self.delay = file.container_delay if isinstance(file, MuxingFile) else delay
        self.lang = lang
        self.type = type if isinstance(type, TrackType) else (TrackType(type) if isinstance(type, int) else TrackType[type.upper()])
        self.args = args

    def mkvmerge_args(self) -> list[str]:
        filepath = str(self.file.resolve())
        if self.type == TrackType.ATTACHMENT:
            is_font = self.file.suffix.lower() in [".ttf", ".otf"]
            if not is_font and not self.lang:
                raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
            if not is_font:
                args = ["--attachment-mime-type", self.lang]
            else:
                args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
            if self.name:
                args.extend(["--attachment-name", self.name])

            args.extend(["--attach-file", filepath])
            return args

        elif self.type == TrackType.MKV:
            return [*self.args, filepath]
        elif self.type == TrackType.CHAPTERS:
            return ["--chapters", filepath]
        args = ["--track-name", f"0:{self.name}"]
        if self.lang:
            args.extend(["--language", f"0:{self.lang}"])
        if self.delay:
            args.extend(["--sync", f"0:{self.delay}"])
        args.extend(
            [
                "--default-track-flag",
                f"0:{'yes' if self.default else 'no'}",
                "--forced-display-flag",
                f"0:{'yes' if self.forced else 'no'}",
            ]
        )
        if self.args:
            args.extend(self.args)
        args.append(filepath)
        return args

args: list[str] | None = args instance-attribute

default: bool = default instance-attribute

delay: int = file.container_delay if isinstance(file, MuxingFile) else delay instance-attribute

file: Path = ensure_path_exists(file, self) instance-attribute

forced: bool = forced instance-attribute

lang: str = lang instance-attribute

name: str = name instance-attribute

type: TrackType = type if isinstance(type, TrackType) else TrackType(type) if isinstance(type, int) else TrackType[type.upper()] instance-attribute

__init__(file, type, name='', lang='', default=True, forced=False, delay=0, args=None)

Source code in muxtools/muxing/tracks.py 
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def __init__(
    self,
    file: PathLike,
    type: str | int | TrackType,
    name: str = "",
    lang: str = "",
    default: bool = True,
    forced: bool = False,
    delay: int = 0,
    args: list[str] | None = None,
) -> None:
    from .muxfiles import MuxingFile

    """
    :param file:        Filepath as string or Path object
    :param type:        TrackType enum, or int or string (1 = 'video', 2 = 'audio', 3 = 'sub')
    :param name:        The track name in the resulting mkv file
    :param lang:        The language tag for the track
    :param default:     Default flag
    :param forced:      Forced flag
    :param delay:       Container delay of track in ms
    """
    self.file = ensure_path_exists(file, self)
    self.default = default
    self.forced = forced
    self.name = name
    self.delay = file.container_delay if isinstance(file, MuxingFile) else delay
    self.lang = lang
    self.type = type if isinstance(type, TrackType) else (TrackType(type) if isinstance(type, int) else TrackType[type.upper()])
    self.args = args

mkvmerge_args()

Source code in muxtools/muxing/tracks.py 
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def mkvmerge_args(self) -> list[str]:
    filepath = str(self.file.resolve())
    if self.type == TrackType.ATTACHMENT:
        is_font = self.file.suffix.lower() in [".ttf", ".otf"]
        if not is_font and not self.lang:
            raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
        if not is_font:
            args = ["--attachment-mime-type", self.lang]
        else:
            args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
        if self.name:
            args.extend(["--attachment-name", self.name])

        args.extend(["--attach-file", filepath])
        return args

    elif self.type == TrackType.MKV:
        return [*self.args, filepath]
    elif self.type == TrackType.CHAPTERS:
        return ["--chapters", filepath]
    args = ["--track-name", f"0:{self.name}"]
    if self.lang:
        args.extend(["--language", f"0:{self.lang}"])
    if self.delay:
        args.extend(["--sync", f"0:{self.delay}"])
    args.extend(
        [
            "--default-track-flag",
            f"0:{'yes' if self.default else 'no'}",
            "--forced-display-flag",
            f"0:{'yes' if self.forced else 'no'}",
        ]
    )
    if self.args:
        args.extend(self.args)
    args.append(filepath)
    return args

VideoTrack

Bases: _track

_track object with VIDEO type preselected and japanese language default

Parameters:

Name Type Description Default
timecode_file PathLike | GlobSearch | None

Pass a path for proper vfr playback if needed.

 None
crop int | tuple[int, int] | tuple[int, int, int, int] | None

Container based cropping with (horizontal, vertical) or (left, top, right, bottom). Will crop the same on all sides if passed a single integer.

 None
Source code in muxtools/muxing/tracks.py 
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class VideoTrack(_track):
    """
    _track object with VIDEO type preselected and japanese language default

    :param timecode_file:       Pass a path for proper vfr playback if needed.
    :param crop:                Container based cropping with (horizontal, vertical) or (left, top, right, bottom).
                                Will crop the same on all sides if passed a single integer.
    """

    def __init__(
        self,
        file: PathLike | GlobSearch,
        name: str = "",
        lang: str = "ja",
        default: bool = True,
        forced: bool = False,
        delay: int = 0,
        timecode_file: PathLike | GlobSearch | None = None,
        crop: int | tuple[int, int] | tuple[int, int, int, int] | None = None,
        args: list[str] = [],
    ) -> None:
        if timecode_file is not None:
            args.extend(["--timestamps", f"0:{ensure_path_exists(timecode_file, self).resolve()}"])
        if crop:
            if isinstance(crop, int):
                crop = tuple([crop] * 4)
            elif len(crop) == 2:
                crop = crop * 2
            args.extend(["--cropping", f"0:{crop[0]},{crop[1]},{crop[2]},{crop[3]}"])
        super().__init__(file, TrackType.VIDEO, name, lang, default, forced, delay, args)

args: list[str] | None = args instance-attribute

default: bool = default instance-attribute

delay: int = file.container_delay if isinstance(file, MuxingFile) else delay instance-attribute

file: Path = ensure_path_exists(file, self) instance-attribute

forced: bool = forced instance-attribute

lang: str = lang instance-attribute

name: str = name instance-attribute

type: TrackType = type if isinstance(type, TrackType) else TrackType(type) if isinstance(type, int) else TrackType[type.upper()] instance-attribute

__init__(file, name='', lang='ja', default=True, forced=False, delay=0, timecode_file=None, crop=None, args=[])

Source code in muxtools/muxing/tracks.py 
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def __init__(
    self,
    file: PathLike | GlobSearch,
    name: str = "",
    lang: str = "ja",
    default: bool = True,
    forced: bool = False,
    delay: int = 0,
    timecode_file: PathLike | GlobSearch | None = None,
    crop: int | tuple[int, int] | tuple[int, int, int, int] | None = None,
    args: list[str] = [],
) -> None:
    if timecode_file is not None:
        args.extend(["--timestamps", f"0:{ensure_path_exists(timecode_file, self).resolve()}"])
    if crop:
        if isinstance(crop, int):
            crop = tuple([crop] * 4)
        elif len(crop) == 2:
            crop = crop * 2
        args.extend(["--cropping", f"0:{crop[0]},{crop[1]},{crop[2]},{crop[3]}"])
    super().__init__(file, TrackType.VIDEO, name, lang, default, forced, delay, args)

mkvmerge_args()

Source code in muxtools/muxing/tracks.py 
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def mkvmerge_args(self) -> list[str]:
    filepath = str(self.file.resolve())
    if self.type == TrackType.ATTACHMENT:
        is_font = self.file.suffix.lower() in [".ttf", ".otf"]
        if not is_font and not self.lang:
            raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
        if not is_font:
            args = ["--attachment-mime-type", self.lang]
        else:
            args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
        if self.name:
            args.extend(["--attachment-name", self.name])

        args.extend(["--attach-file", filepath])
        return args

    elif self.type == TrackType.MKV:
        return [*self.args, filepath]
    elif self.type == TrackType.CHAPTERS:
        return ["--chapters", filepath]
    args = ["--track-name", f"0:{self.name}"]
    if self.lang:
        args.extend(["--language", f"0:{self.lang}"])
    if self.delay:
        args.extend(["--sync", f"0:{self.delay}"])
    args.extend(
        [
            "--default-track-flag",
            f"0:{'yes' if self.default else 'no'}",
            "--forced-display-flag",
            f"0:{'yes' if self.forced else 'no'}",
        ]
    )
    if self.args:
        args.extend(self.args)
    args.append(filepath)
    return args

AudioTrack

Bases: _track

_track object with AUDIO type preselected and japanese language default

Source code in muxtools/muxing/tracks.py 
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class AudioTrack(_track):
    """
    _track object with AUDIO type preselected and japanese language default
    """

    def __init__(
        self,
        file: PathLike | GlobSearch,
        name: str = "",
        lang: str = "ja",
        default: bool = True,
        forced: bool = False,
        delay: int = 0,
        args: list[str] | None = None,
    ) -> None:
        super().__init__(file, TrackType.AUDIO, name, lang, default, forced, delay, args)

args: list[str] | None = args instance-attribute

default: bool = default instance-attribute

delay: int = file.container_delay if isinstance(file, MuxingFile) else delay instance-attribute

file: Path = ensure_path_exists(file, self) instance-attribute

forced: bool = forced instance-attribute

lang: str = lang instance-attribute

name: str = name instance-attribute

type: TrackType = type if isinstance(type, TrackType) else TrackType(type) if isinstance(type, int) else TrackType[type.upper()] instance-attribute

__init__(file, name='', lang='ja', default=True, forced=False, delay=0, args=None)

Source code in muxtools/muxing/tracks.py 
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def __init__(
    self,
    file: PathLike | GlobSearch,
    name: str = "",
    lang: str = "ja",
    default: bool = True,
    forced: bool = False,
    delay: int = 0,
    args: list[str] | None = None,
) -> None:
    super().__init__(file, TrackType.AUDIO, name, lang, default, forced, delay, args)

mkvmerge_args()

Source code in muxtools/muxing/tracks.py 
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def mkvmerge_args(self) -> list[str]:
    filepath = str(self.file.resolve())
    if self.type == TrackType.ATTACHMENT:
        is_font = self.file.suffix.lower() in [".ttf", ".otf"]
        if not is_font and not self.lang:
            raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
        if not is_font:
            args = ["--attachment-mime-type", self.lang]
        else:
            args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
        if self.name:
            args.extend(["--attachment-name", self.name])

        args.extend(["--attach-file", filepath])
        return args

    elif self.type == TrackType.MKV:
        return [*self.args, filepath]
    elif self.type == TrackType.CHAPTERS:
        return ["--chapters", filepath]
    args = ["--track-name", f"0:{self.name}"]
    if self.lang:
        args.extend(["--language", f"0:{self.lang}"])
    if self.delay:
        args.extend(["--sync", f"0:{self.delay}"])
    args.extend(
        [
            "--default-track-flag",
            f"0:{'yes' if self.default else 'no'}",
            "--forced-display-flag",
            f"0:{'yes' if self.forced else 'no'}",
        ]
    )
    if self.args:
        args.extend(self.args)
    args.append(filepath)
    return args

SubTrack

Bases: _track

_track object with SUB type preselected and english language default

Supports merging multiple files by passing a List of Path objects or filepath strings and of course also a GlobSearch

Source code in muxtools/muxing/tracks.py 
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class SubTrack(_track):
    """
    _track object with SUB type preselected and english language default

    Supports merging multiple files by passing a List of Path objects or filepath strings
    and of course also a GlobSearch
    """

    def __init__(
        self,
        file: PathLike | GlobSearch,
        name: str = "",
        lang: str = "en",
        default: bool = True,
        forced: bool = False,
        delay: int = 0,
        args: list[str] | None = None,
    ) -> None:
        super().__init__(file, TrackType.SUB, name, lang, default, forced, delay, args)

args: list[str] | None = args instance-attribute

default: bool = default instance-attribute

delay: int = file.container_delay if isinstance(file, MuxingFile) else delay instance-attribute

file: Path = ensure_path_exists(file, self) instance-attribute

forced: bool = forced instance-attribute

lang: str = lang instance-attribute

name: str = name instance-attribute

type: TrackType = type if isinstance(type, TrackType) else TrackType(type) if isinstance(type, int) else TrackType[type.upper()] instance-attribute

__init__(file, name='', lang='en', default=True, forced=False, delay=0, args=None)

Source code in muxtools/muxing/tracks.py 
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def __init__(
    self,
    file: PathLike | GlobSearch,
    name: str = "",
    lang: str = "en",
    default: bool = True,
    forced: bool = False,
    delay: int = 0,
    args: list[str] | None = None,
) -> None:
    super().__init__(file, TrackType.SUB, name, lang, default, forced, delay, args)

mkvmerge_args()

Source code in muxtools/muxing/tracks.py 
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def mkvmerge_args(self) -> list[str]:
    filepath = str(self.file.resolve())
    if self.type == TrackType.ATTACHMENT:
        is_font = self.file.suffix.lower() in [".ttf", ".otf"]
        if not is_font and not self.lang:
            raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
        if not is_font:
            args = ["--attachment-mime-type", self.lang]
        else:
            args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
        if self.name:
            args.extend(["--attachment-name", self.name])

        args.extend(["--attach-file", filepath])
        return args

    elif self.type == TrackType.MKV:
        return [*self.args, filepath]
    elif self.type == TrackType.CHAPTERS:
        return ["--chapters", filepath]
    args = ["--track-name", f"0:{self.name}"]
    if self.lang:
        args.extend(["--language", f"0:{self.lang}"])
    if self.delay:
        args.extend(["--sync", f"0:{self.delay}"])
    args.extend(
        [
            "--default-track-flag",
            f"0:{'yes' if self.default else 'no'}",
            "--forced-display-flag",
            f"0:{'yes' if self.forced else 'no'}",
        ]
    )
    if self.args:
        args.extend(self.args)
    args.append(filepath)
    return args

Premux

Bases: _track

Source code in muxtools/muxing/tracks.py 
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class Premux(_track):
    def __init__(
        self,
        file: PathLike | GlobSearch,
        video: int | list[int] | None = -1,
        audio: int | list[int] | None = -1,
        subtitles: int | list[int] | None = -1,
        keep_attachments: bool = True,
        mkvmerge_args: str | list[str] = "--no-global-tags",
        assume_absolute: bool = False,
    ) -> None:
        """
        Custom Track object to arbitrarily grab tracks from an existing file.

        For all track params:
        `None` means there won't be any chosen and `-1` means all will be chosen.
        You can also specify a single or multiple *relative* track numbers to choose any.

        :param video:               Video Track(s) to choose
        :param audio:               Audio Track(s) to choose
        :param subtitles:           Subtitle Track(s) to choose
        :param keep_attachments:    Whether to keep attachments from the file. Fonts for example.
        :param mkvmerge_args:       Any other args you may want to pass.
        :param assume_absolute:     Assume that the track numbers passed were already absolute to begin with.
                                    If False it will simply get absolute numbers derived from the relative ones.
        """
        args = ""
        if video is None:
            args += " -D"
        elif video != -1:
            if isinstance(video, list):
                lv = []
                for num in video:
                    abso = get_absolute_tracknum(file, num, TrackType.VIDEO) if not assume_absolute else num
                    lv.append(abso)
                args += f" -d {','.join(str(i) for i in lv)}"
            else:
                abso = get_absolute_tracknum(file, video, TrackType.VIDEO) if not assume_absolute else video
                args += f" -d {abso}"

        if audio is None:
            args += " -A"
        elif audio != -1:
            if isinstance(audio, list):
                la = []
                for num in audio:
                    abso = get_absolute_tracknum(file, num, TrackType.AUDIO) if not assume_absolute else num
                    la.append(abso)
                args += f" -a {','.join(str(i) for i in la)}"
            else:
                abso = get_absolute_tracknum(file, audio, TrackType.AUDIO) if not assume_absolute else audio
                args += f" -a {abso}"

        if subtitles is None:
            args += " -S"
        elif subtitles != -1:
            if isinstance(subtitles, list):
                ls = []
                for num in subtitles:
                    abso = get_absolute_tracknum(file, num, TrackType.SUB) if not assume_absolute else num
                    ls.append(abso)
                args += f" -s {','.join(str(i) for i in ls)}"
            else:
                abso = get_absolute_tracknum(file, subtitles, TrackType.SUB) if not assume_absolute else subtitles
                args += f" -s {abso}"

        if not keep_attachments:
            args += " -M"

        args = split_args(args.strip())
        mkvmerge_args = split_args(mkvmerge_args.strip()) if isinstance(mkvmerge_args, str) else mkvmerge_args
        super().__init__(file, TrackType.MKV, args=args + mkvmerge_args)

args: list[str] | None = args instance-attribute

default: bool = default instance-attribute

delay: int = file.container_delay if isinstance(file, MuxingFile) else delay instance-attribute

file: Path = ensure_path_exists(file, self) instance-attribute

forced: bool = forced instance-attribute

lang: str = lang instance-attribute

name: str = name instance-attribute

type: TrackType = type if isinstance(type, TrackType) else TrackType(type) if isinstance(type, int) else TrackType[type.upper()] instance-attribute

__init__(file, video=-1, audio=-1, subtitles=-1, keep_attachments=True, mkvmerge_args='--no-global-tags', assume_absolute=False)

Custom Track object to arbitrarily grab tracks from an existing file.

For all track params: None means there won't be any chosen and -1 means all will be chosen. You can also specify a single or multiple relative track numbers to choose any.

Parameters:

Name Type Description Default
video int | list[int] | None

Video Track(s) to choose

 -1
audio int | list[int] | None

Audio Track(s) to choose

 -1
subtitles int | list[int] | None

Subtitle Track(s) to choose

 -1
keep_attachments bool

Whether to keep attachments from the file. Fonts for example.

 True
mkvmerge_args str | list[str]

Any other args you may want to pass.

 '--no-global-tags'
assume_absolute bool

Assume that the track numbers passed were already absolute to begin with. If False it will simply get absolute numbers derived from the relative ones.

 False
Source code in muxtools/muxing/tracks.py 
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def __init__(
    self,
    file: PathLike | GlobSearch,
    video: int | list[int] | None = -1,
    audio: int | list[int] | None = -1,
    subtitles: int | list[int] | None = -1,
    keep_attachments: bool = True,
    mkvmerge_args: str | list[str] = "--no-global-tags",
    assume_absolute: bool = False,
) -> None:
    """
    Custom Track object to arbitrarily grab tracks from an existing file.

    For all track params:
    `None` means there won't be any chosen and `-1` means all will be chosen.
    You can also specify a single or multiple *relative* track numbers to choose any.

    :param video:               Video Track(s) to choose
    :param audio:               Audio Track(s) to choose
    :param subtitles:           Subtitle Track(s) to choose
    :param keep_attachments:    Whether to keep attachments from the file. Fonts for example.
    :param mkvmerge_args:       Any other args you may want to pass.
    :param assume_absolute:     Assume that the track numbers passed were already absolute to begin with.
                                If False it will simply get absolute numbers derived from the relative ones.
    """
    args = ""
    if video is None:
        args += " -D"
    elif video != -1:
        if isinstance(video, list):
            lv = []
            for num in video:
                abso = get_absolute_tracknum(file, num, TrackType.VIDEO) if not assume_absolute else num
                lv.append(abso)
            args += f" -d {','.join(str(i) for i in lv)}"
        else:
            abso = get_absolute_tracknum(file, video, TrackType.VIDEO) if not assume_absolute else video
            args += f" -d {abso}"

    if audio is None:
        args += " -A"
    elif audio != -1:
        if isinstance(audio, list):
            la = []
            for num in audio:
                abso = get_absolute_tracknum(file, num, TrackType.AUDIO) if not assume_absolute else num
                la.append(abso)
            args += f" -a {','.join(str(i) for i in la)}"
        else:
            abso = get_absolute_tracknum(file, audio, TrackType.AUDIO) if not assume_absolute else audio
            args += f" -a {abso}"

    if subtitles is None:
        args += " -S"
    elif subtitles != -1:
        if isinstance(subtitles, list):
            ls = []
            for num in subtitles:
                abso = get_absolute_tracknum(file, num, TrackType.SUB) if not assume_absolute else num
                ls.append(abso)
            args += f" -s {','.join(str(i) for i in ls)}"
        else:
            abso = get_absolute_tracknum(file, subtitles, TrackType.SUB) if not assume_absolute else subtitles
            args += f" -s {abso}"

    if not keep_attachments:
        args += " -M"

    args = split_args(args.strip())
    mkvmerge_args = split_args(mkvmerge_args.strip()) if isinstance(mkvmerge_args, str) else mkvmerge_args
    super().__init__(file, TrackType.MKV, args=args + mkvmerge_args)

mkvmerge_args()

Source code in muxtools/muxing/tracks.py 
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def mkvmerge_args(self) -> list[str]:
    filepath = str(self.file.resolve())
    if self.type == TrackType.ATTACHMENT:
        is_font = self.file.suffix.lower() in [".ttf", ".otf"]
        if not is_font and not self.lang:
            raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
        if not is_font:
            args = ["--attachment-mime-type", self.lang]
        else:
            args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
        if self.name:
            args.extend(["--attachment-name", self.name])

        args.extend(["--attach-file", filepath])
        return args

    elif self.type == TrackType.MKV:
        return [*self.args, filepath]
    elif self.type == TrackType.CHAPTERS:
        return ["--chapters", filepath]
    args = ["--track-name", f"0:{self.name}"]
    if self.lang:
        args.extend(["--language", f"0:{self.lang}"])
    if self.delay:
        args.extend(["--sync", f"0:{self.delay}"])
    args.extend(
        [
            "--default-track-flag",
            f"0:{'yes' if self.default else 'no'}",
            "--forced-display-flag",
            f"0:{'yes' if self.forced else 'no'}",
        ]
    )
    if self.args:
        args.extend(self.args)
    args.append(filepath)
    return args

Attachment

Bases: _track

pseudo _track object for attachments

Source code in muxtools/muxing/tracks.py 
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class Attachment(_track):
    """
    pseudo _track object for attachments
    """

    def __init__(self, file: str | Path, mimetype: str = "", name: str = "") -> None:
        super().__init__(file, TrackType.ATTACHMENT, lang=mimetype, name=name)

args: list[str] | None = args instance-attribute

default: bool = default instance-attribute

delay: int = file.container_delay if isinstance(file, MuxingFile) else delay instance-attribute

file: Path = ensure_path_exists(file, self) instance-attribute

forced: bool = forced instance-attribute

lang: str = lang instance-attribute

name: str = name instance-attribute

type: TrackType = type if isinstance(type, TrackType) else TrackType(type) if isinstance(type, int) else TrackType[type.upper()] instance-attribute

__init__(file, mimetype='', name='')

Source code in muxtools/muxing/tracks.py 
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def __init__(self, file: str | Path, mimetype: str = "", name: str = "") -> None:
    super().__init__(file, TrackType.ATTACHMENT, lang=mimetype, name=name)

mkvmerge_args()

Source code in muxtools/muxing/tracks.py 
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def mkvmerge_args(self) -> list[str]:
    filepath = str(self.file.resolve())
    if self.type == TrackType.ATTACHMENT:
        is_font = self.file.suffix.lower() in [".ttf", ".otf"]
        if not is_font and not self.lang:
            raise ValueError("Please specify a mimetype for the attachments if they're not fonts!")
        if not is_font:
            args = ["--attachment-mime-type", self.lang]
        else:
            args = ["--attachment-mime-type", "font/ttf" if self.file.suffix.lower() == ".ttf" else "font/otf"]
        if self.name:
            args.extend(["--attachment-name", self.name])

        args.extend(["--attach-file", filepath])
        return args

    elif self.type == TrackType.MKV:
        return [*self.args, filepath]
    elif self.type == TrackType.CHAPTERS:
        return ["--chapters", filepath]
    args = ["--track-name", f"0:{self.name}"]
    if self.lang:
        args.extend(["--language", f"0:{self.lang}"])
    if self.delay:
        args.extend(["--sync", f"0:{self.delay}"])
    args.extend(
        [
            "--default-track-flag",
            f"0:{'yes' if self.default else 'no'}",
            "--forced-display-flag",
            f"0:{'yes' if self.forced else 'no'}",
        ]
    )
    if self.args:
        args.extend(self.args)
    args.append(filepath)
    return args