opentimelineio.core

Core implementation details and wrappers around the C++ library

class opentimelineio.core.Composable(name: str = '', metadata: object = None)

An object that can be composed within a Composition (such as Track or Stack).

overlapping() → bool

parent() → opentimelineio._otio.Composition

visible() → bool

class opentimelineio.core.Composition(name: str = '', children: Optional[List[opentimelineio._otio.Composable]] = None, source_range: Optional[opentimelineio._opentime.TimeRange] = None, metadata: object = None)

Base class for an Item that contains Composables.

Should be subclassed (for example by Track and Stack), not used directly.

child_at_time(search_time: opentimelineio._opentime.RationalTime, shallow_search: bool = False) → opentimelineio._otio.Composable

children_in_range(search_range: opentimelineio._opentime.TimeRange) → List[opentimelineio._otio.SerializableObject]

property composition_kind

find_children(descended_from_type: object = None, search_range: Optional[opentimelineio._opentime.TimeRange] = None, shallow_search: bool = False) → List[opentimelineio._otio.SerializableObject]

handles_of_child(child: opentimelineio._otio.Composable) → tuple

has_clips() → bool

insert(index, item)

is_parent_of(other: opentimelineio._otio.Composable) → bool

range_of_all_children() → dict

range_of_child(child: opentimelineio._otio.Composable, reference_space: opentimelineio._otio.Composable = None) → opentimelineio._opentime.TimeRange

range_of_child_at_index(index: int) → opentimelineio._opentime.TimeRange

trim_child_range(child_range: opentimelineio._opentime.TimeRange) → Optional[opentimelineio._opentime.TimeRange]

trimmed_child_range(child_range: opentimelineio._opentime.TimeRange) → Optional[opentimelineio._opentime.TimeRange]

trimmed_range_of_child(child: opentimelineio._otio.Composable, reference_space: opentimelineio._otio.Composable = None) → Optional[opentimelineio._opentime.TimeRange]

trimmed_range_of_child_at_index(index: int) → opentimelineio._opentime.TimeRange

class opentimelineio.core.Item(name: str = '', source_range: Optional[opentimelineio._opentime.TimeRange] = None, effects: Optional[List[opentimelineio._otio.Effect]] = None, markers: Optional[List[opentimelineio._otio.Marker]] = None, enabled: bool = True, metadata: object = None)

property available_image_bounds

available_range() → opentimelineio._opentime.TimeRange

duration() → opentimelineio._opentime.RationalTime

property effects

property enabled

If true, an Item contributes to compositions. For example, when an audio/video clip is enabled=false the clip is muted/hidden.

property markers

range_in_parent() → opentimelineio._opentime.TimeRange

property source_range

transformed_time(time: opentimelineio._opentime.RationalTime, to_item: opentimelineio._otio.Item) → opentimelineio._opentime.RationalTime

transformed_time_range(time_range: opentimelineio._opentime.TimeRange, to_item: opentimelineio._otio.Item) → opentimelineio._opentime.TimeRange

trimmed_range() → opentimelineio._opentime.TimeRange

trimmed_range_in_parent() → Optional[opentimelineio._opentime.TimeRange]

visible_range() → opentimelineio._opentime.TimeRange

class opentimelineio.core.MediaReference(name: str = '', available_range: Optional[opentimelineio._opentime.TimeRange] = None, metadata: object = None, available_image_bounds: Optional[opentimelineio._otio.Box2d] = None)

property available_image_bounds

property available_range

property is_missing_reference

class opentimelineio.core.SerializableObject

Superclass for all classes whose instances can be serialized.

clone() → opentimelineio._otio.SerializableObject

deepcopy(*args, **kwargs)

static from_json_file(file_name: str) → opentimelineio._otio.SerializableObject

static from_json_string(input: str) → opentimelineio._otio.SerializableObject

is_equivalent_to(other: opentimelineio._otio.SerializableObject) → bool

property is_unknown_schema

schema_name() → str

schema_version() → int

to_json_file(file_name: str, indent: int = 4) → bool

to_json_string(indent: int = 4) → str

class opentimelineio.core.SerializableObjectWithMetadata(name: str = '', metadata: object = None)

property metadata

property name

class opentimelineio.core.Track(name: str = '', children: Optional[List[opentimelineio._otio.Composable]] = None, source_range: Optional[opentimelineio._opentime.TimeRange] = None, kind: str = 'Video', metadata: object = None)

class Kind

Audio = 'Audio'

Video = 'Video'

class NeighborGapPolicy(value: int)

Members:

around_transitions

never

around_transitions = <NeighborGapPolicy.around_transitions: 1>

property name

never = <NeighborGapPolicy.never: 0>

property value

find_clips(search_range: Optional[opentimelineio._opentime.TimeRange] = None, shallow_search: bool = False) → List[opentimelineio._otio.SerializableObject]

property kind

neighbors_of(item: opentimelineio._otio.Composable, policy: opentimelineio._otio.Track.NeighborGapPolicy = <NeighborGapPolicy.never: 0>) → tuple

opentimelineio.core.add_method(cls)

opentimelineio.core.deprecated_field()

For marking attributes on a SerializableObject deprecated.

opentimelineio.core.deserialize_json_from_file(filename: str) → object

Deserialize json file to in-memory objects.

Parameters

filename (str) – path to json file to read

Returns

root object in the file (usually a Timeline or SerializableCollection)

Return type

SerializableObject

opentimelineio.core.deserialize_json_from_string(input: str) → object

Deserialize json string to in-memory objects.

Parameters

input (str) – json string to deserialize

Returns

root object in the string (usually a Timeline or SerializableCollection)

Return type

SerializableObject

opentimelineio.core.downgrade_function_from(cls, version_to_downgrade_from)

Decorator for identifying schema class downgrade functions.

Example:

@downgrade_function_from(MyClass, 5)
def downgrade_from_five_to_four(data):
    return {"old_attr": data["new_attr"]}

This will get called to downgrade a schema of MyClass from version 5 to version 4. MyClass must be a class deriving from SerializableObject.

The downgrade function should take a single argument - the dictionary to downgrade, and return a dictionary with the fields downgraded.

Parameters

• cls (Type[SerializableObject]) – class to downgrade

• version_to_downgrade_from (int) – the function downgrading from this version to (version - 1)

opentimelineio.core.flatten_stack(in_stack: opentimelineio._otio.Stack) → opentimelineio._otio.Track

opentimelineio.core.flatten_stack(tracks: List[opentimelineio._otio.Track]) → opentimelineio._otio.Track

Overloaded function.

1. flatten_stack(in_stack: opentimelineio._otio.Stack) -> opentimelineio._otio.Track

2. flatten_stack(tracks: List[opentimelineio._otio.Track]) -> opentimelineio._otio.Track

opentimelineio.core.install_external_keepalive_monitor(so: opentimelineio._otio.SerializableObject, apply_now: bool) → None

opentimelineio.core.instance_from_schema(schema_name: str, schema_version: int, data: object) → opentimelineio._otio.SerializableObject

Return an instance of the schema from data in the data_dict.

Raises

UnsupportedSchemaError – when the requested schema version is greater than the registered schema version.

opentimelineio.core.register_type(classobj, schemaname=None)

Decorator for registering a SerializableObject type

Example:

@otio.core.register_type
class SimpleClass(otio.core.SerializableObject):
  serializable_label = "SimpleClass.2"
  ...

Parameters

• cls (Type[SerializableObject]) – class to register

• schemaname (str) – Schema name (default: parse from serializable_label)

opentimelineio.core.release_to_schema_version_map() → Dict[str, Dict[str, int]]

Fetch the compiled in CORE_VERSION_MAP.

The CORE_VERSION_MAP maps OTIO release versions to maps of schema name to schema version and is autogenerated by the OpenTimelineIO build and release system. For example: {“0.15.0”: {“Clip”: 2, …}}

Returns

dictionary mapping core version label to schema_version_map

Return type

dict[str, dict[str, int]]

opentimelineio.core.serializable_field(name, required_type=None, doc=None)

Convenience function for adding attributes to child classes of SerializableObject in such a way that they will be serialized/deserialized automatically.

Use it like this:

@core.register_type
class Foo(SerializableObject):
    bar = serializable_field("bar", required_type=int, doc="example")

This would indicate that class “foo” has a serializable field “bar”. So:

f = foo()
f.bar = "stuff"

# serialize & deserialize
otio_json = otio.adapters.from_name("otio")
f2 = otio_json.read_from_string(otio_json.write_to_string(f))

# fields should be equal
f.bar == f2.bar

Additionally, the “doc” field will become the documentation for the property.

Parameters

• name (str) – name of the field to add

• required_type (type) – type required for the field

• doc (str) – field documentation

Returns

property object

Return type

property

opentimelineio.core.serialize_json_to_file(root, filename, schema_version_targets=None, indent=4)

Serialize root to a json file. Optionally downgrade resulting schemas to schema_version_targets.

Parameters

• root (SerializableObject) – root object to serialize

• schema_version_targets (dict[str, int]) – optional dictionary mapping schema name to desired schema version, for downgrading the result to be compatible with older versions of OpenTimelineIO.

• indent (int) – number of spaces for each json indentation level. Use -1 for no indentation or newlines.

Returns

true for success, false for failure

Return type

bool

opentimelineio.core.serialize_json_to_string(root, schema_version_targets=None, indent=4)

Serialize root to a json string. Optionally downgrade resulting schemas to schema_version_targets.

Parameters

• root (SerializableObject) – root object to serialize

• schema_version_targets (dict[str, int]) – optional dictionary mapping schema name to desired schema version, for downgrading the result to be compatible with older versions of OpenTimelineIO.

• indent (int) – number of spaces for each json indentation level. Use -1 for no indentation or newlines.

Returns

resulting json string

Return type

str

opentimelineio.core.set_type_record(serializable_obejct: opentimelineio._otio.SerializableObject, schema_name: str) → None

opentimelineio.core.type_version_map() → Dict[str, int]

Fetch the currently registered schemas and their versions.

Returns

Map of all registered schema names to their current versions.

Return type

dict[str, int]

opentimelineio.core.upgrade_function_for(cls, version_to_upgrade_to)

Decorator for identifying schema class upgrade functions.

Example:

@upgrade_function_for(MyClass, 5)
def upgrade_to_version_five(data):
    pass

This will get called to upgrade a schema of MyClass to version 5. MyClass must be a class deriving from SerializableObject.

The upgrade function should take a single argument - the dictionary to upgrade, and return a dictionary with the fields upgraded.

Remember that you don’t need to provide an upgrade function for upgrades that add or remove fields, only for schema versions that change the field names.

Parameters

• cls (Type[SerializableObject]) – class to upgrade

• version_to_upgrade_to (int) – the version to upgrade to

Modules

opentimelineio.core.composable
opentimelineio.core.composition
opentimelineio.core.item
opentimelineio.core.mediaReference