Python FrameSamplingFilter Example

Introduction

The python framesamplingfilter example is extracted from the most popular open source projects, you can refer to the following example for usage.

Programming language: Python

Namespace/package name: pliersfilters

Example#1

File: test_video_filters.pyProject: tyarkoni/featureX

def test_frame_sampling_video_filter():
    filename = join(VIDEO_DIR, 'small.mp4')
    video = VideoStim(filename, onset=4.2)
    assert video.fps == 30
    assert video.n_frames in (167, 168)
    assert video.width == 560

    # Test frame filters
    conv = FrameSamplingFilter(every=3)
    derived = conv.transform(video)
    assert derived.n_frames == math.ceil(video.n_frames / 3.0)
    assert derived.duration == video.duration
    first = next(f for f in derived)
    assert type(first) == VideoFrameStim
    assert first.name == 'frame[0]'
    assert first.onset == 4.2
    assert first.duration == 3 * (1 / 30.0)
    second = [f for f in derived][1]
    assert second.onset == 4.3
    with pytest.raises(TypeError):
        derived.get_frame(onset=1.0)

    # Commented out because no longer allowing sampling filter chaining
    # conv = FrameSamplingFilter(hertz=15)
    # derived = conv.transform(derived)
    # assert derived.n_frames == math.ceil(video.n_frames / 6.0)
    # first = next(f for f in derived)
    # assert type(first) == VideoFrameStim
    # assert first.duration == 3 * (1 / 15.0)
    # second = [f for f in derived][1]
    # assert second.onset == 4.4

    with pytest.raises(TypeError):
        conv.transform(derived)

Example#2

File: test_google_extractors.pyProject: tyarkoni/featureX

def test_google_vision_face_batch():
    stims = ['apple', 'obama', 'thai_people']
    stim_files = [join(get_test_data_path(), 'image', '%s.jpg' % s)
                  for s in stims]
    stims = [ImageStim(s) for s in stim_files]
    ext = GoogleVisionAPIFaceExtractor(batch_size=5)
    result = ext.transform(stims)
    result = merge_results(result, format='wide', extractor_names=False,
                           handle_annotations='first')
    assert result.shape == (2, 139)
    assert 'joyLikelihood' in result.columns
    assert result['joyLikelihood'][0] == 'VERY_LIKELY'
    assert result['joyLikelihood'][1] == 'VERY_LIKELY'

    video = VideoStim(join(VIDEO_DIR, 'obama_speech.mp4'))
    conv = FrameSamplingFilter(every=10)
    video = conv.transform(video)
    result = ext.transform(video)
    result = merge_results(result, format='wide', extractor_names=False)
    assert 'joyLikelihood' in result.columns
    assert result.shape == (22, 139)

    video = VideoStim(join(VIDEO_DIR, 'small.mp4'))
    video = conv.transform(video)
    result = ext.transform(video)
    result = merge_results(result, format='wide', extractor_names=False)
    assert 'joyLikelihood' not in result.columns
    assert len(result) == 0

Example#3

File: test_video_filters.pyProject: tyarkoni/featureX

def test_frame_sampling_cv2():
    pytest.importorskip('cv2')
    filename = join(VIDEO_DIR, 'small.mp4')
    video = VideoStim(filename)

    conv = FrameSamplingFilter(top_n=5)
    derived = conv.transform(video)
    assert derived.n_frames == 5
    assert type(next(f for f in derived)) == VideoFrameStim

Example#4

File: test_video_filters.pyProject: tyarkoni/featureX

def test_frame_sampling_video_filter2():
    filename = join(VIDEO_DIR, 'obama_speech.mp4')
    video = VideoStim(filename, onset=4.2)
    assert video.fps == 12
    assert video.n_frames == 105

    # Test frame indices
    conv = FrameSamplingFilter(every=3)
    derived = conv.transform(video)
    assert derived.n_frames == 35
    assert derived.frame_index[4] == 12
    conv = FrameSamplingFilter(hertz=3)
    derived = conv.transform(video)
    assert derived.n_frames == 27
    assert derived.frame_index[3] == 12
    conv = FrameSamplingFilter(hertz=24)
    derived = conv.transform(video)
    assert derived.n_frames == 210
    assert derived.frame_index[4] == 2
    video.fps = 11.8
    conv = FrameSamplingFilter(hertz=1)
    derived = conv.transform(video)
    assert derived.n_frames == 9
    assert derived.frame_index[4] == 47
    assert derived.frame_index[5] == 59

Example#5

File: test_utils.pyProject: tyarkoni/featureX

def test_progress_bar(capfd):

    video_dir = join(get_test_data_path(), 'video')
    video = VideoStim(join(video_dir, 'obama_speech.mp4'))
    conv = FrameSamplingFilter(hertz=2)

    old_val = config.get_option('progress_bar')
    config.set_option('progress_bar', True)

    derived = conv.transform(video)
    out, err = capfd.readouterr()
    assert 'Video frame:' in err and '100%' in err

    config.set_option('progress_bar', False)
    derived = conv.transform(video)
    out, err = capfd.readouterr()
    assert 'Video frame:' not in err and '100%' not in err

    config.set_option('progress_bar', old_val)