mexca.pipeline

Build a pipeline to extract emotion expression features from a video file.

Module Contents

Classes

Pipeline

Build a pipeline to extract emotion expression features from a video file.

class mexca.pipeline.Pipeline(face_extractor: Optional[Union[FaceExtractor, FaceExtractorContainer]] = None, speaker_identifier: Optional[Union[SpeakerIdentifier, SpeakerIdentifierContainer]] = None, voice_extractor: Optional[Union[VoiceExtractor, VoiceExtractorContainer]] = None, audio_transcriber: Optional[Union[AudioTranscriber, AudioTranscriberContainer]] = None, sentiment_extractor: Optional[Union[SentimentExtractor, SentimentExtractorContainer]] = None)

Build a pipeline to extract emotion expression features from a video file.

Takes either component objects or container component objects (or a mix of both) as input.

Parameters

• face_extractor (FaceExtractor or FaceExtractorContainer, optional, default=None) – Component for detecting and identifying faces as well as extracting facial features.

• speaker_identifier (SpeakerIdentifier or SpeakerIdentifierContainer, optional, default=None) – Component for identifying speech segments and speakers.

• voice_extractor (VoiceExtractor or VoiceExtractorContainer, optional, default=None) – Component for extracting voice features.

• audio_transcriber (AudioTranscriber or AudioTranscriberContainer, optional, default=None) – Component for transcribing speech segments to text.

• sentiment_extractor (SentimentExtractor or SentimentExtractorContainer, optional, default=None) – Component for extracting sentiment from text.

Examples

Create a pipeline with standard components.

>>> from mexca import Pipeline
>>> from mexca.audio import SpeakerIdentifier, VoiceExtractor
>>> from mexca.text import AudioTranscriber, SentimentExtractor
>>> from mexca.video import FaceExtractor
>>> num_faces = 2
>>> num_speaker = 2
>>> pipeline = Pipeline(
...     face_extractor=FaceExtractor(num_faces=num_faces),
...     speaker_identifier=SpeakerIdentifier(
...         num_speakers=num_speakers
...     ),
...     voice_extractor=VoiceExtractor(),
...     audio_transcriber=AudioTranscriber(),
...     sentiment_extractor=SentimentExtractor()
... )

Create a pipeline with container components.

>>> from mexca import Pipeline
>>> from mexca.container import AudioTranscriberContainer, FaceExtractorContainer,
>>>     SentimentExtractorContainer, SpeakerIdentifierContainer, VoiceExtractorContainer
>>> num_faces = 2
>>> num_speaker = 2
>>> pipeline = Pipeline(
...     face_extractor=FaceExtractorContainer(num_faces=num_faces),
...     speaker_identifier=SpeakerIdentifierContainer(
...         num_speakers=num_speakers
...     ),
...     voice_extractor=VoiceExtractorContainer(),
...     audio_transcriber=AudioTranscriberContainer(),
...     sentiment_extractor=SentimentExtractorContainer()
... )

Create a pipeline with standard and container components.

>>> from mexca import Pipeline
>>> from mexca.audio import SpeakerIdentifier, VoiceExtractor
>>> from mexca.container import AudioTranscriberContainer, FaceExtractorContainer,
>>>     SentimentExtractorContainer
>>> num_faces = 2
>>> num_speaker = 2
>>> pipeline = Pipeline(
...     face_extractor=FaceExtractorContainer(num_faces=num_faces),
...     speaker_identifier=SpeakerIdentifier( # standard
...         num_speakers=num_speakers
...     ),
...     voice_extractor=VoiceExtractor(), # standard
...     audio_transcriber=AudioTranscriberContainer(),
...     sentiment_extractor=SentimentExtractorContainer()
... )

apply(filepath: str, frame_batch_size: int = 1, skip_frames: int = 1, process_subclip: Tuple[Optional[float]] = (0, None), language: Optional[str] = None, keep_audiofile: bool = False, show_progress: bool = True) → mexca.data.Multimodal

Extract emotion expression features from a video file.

This is the main function to apply the complete mexca pipeline to a video file.

Parameters

• filepath (str) – Path to the video file.

• frame_batch_size (int, default=1) – Size of the batch of video frames that are loaded and processed at the same time.

• skip_frames (int, default=1) – Only process every nth frame, starting at 0.

• process_subclip (tuple, default=(0, None)) – Process only a part of the video clip. Must be the start and end of the subclip in seconds. None indicates the end of the video.

• language (str, optional, default=None) – The language of the speech that is transcribed. If None, the language is detected for each speech segment.

• keep_audiofile (bool, default=False) – Keeps the audio file after processing. If False, the audio file is only stored temporarily.

• show_progress (bool, default=True) – Enables progress bars and printing info logging messages to the console. The logging is overriden when a custom logger is explicitly created.

Returns

A data class object that contains the extracted merged features in the features attribute. See the Output section for details.

Return type

Multimodal

See also

mexca.data.Multimodal

Examples

>>> import pandas as pd
>>> filepath = 'path/to/video'
>>> output = pipeline.apply(filepath)
>>> assert isinstance(output.features, pd.DataFrame)
True