def test_frames(video_with_small, start, end, step, error):
"""Test frame extraction."""
frame_indices = []
tmp = tempfile.mkdtemp(dir=dirname(__file__))
# Convert percentages to values
duration = float(ff_probe(video_with_small, 'duration'))
time_step = duration * step / 100
start_time = duration * start / 100
end_time = (duration * end / 100) + 0.01
arguments = dict(input_file=video_with_small,
start=start_time,
end=end_time,
step=time_step,
duration=duration,
output=join(tmp, 'img{0:02d}.jpg'),
progress_callback=lambda i: frame_indices.append(i))
# Extract frames
if error:
with pytest.raises(error):
ff_frames(**arguments)
else:
ff_frames(**arguments)
# Check that progress updates are complete
expected_file_no = int(((end - start) / step) + 1)
assert frame_indices == list(range(1, expected_file_no + 1))
# Check number of generated files
file_no = len([f for f in listdir(tmp) if isfile(join(tmp, f))])
assert file_no == expected_file_no
shutil.rmtree(tmp)
def test_ffmpeg_mov(video_mov):
"""Test ffmpeg wrapper for extract frames."""
tmp = tempfile.mkdtemp(dir=dirname(__file__))
start, end = 5, 95
ff_frames(video_mov, start, end, 1, join(tmp, 'img%d.jpg'))
file_no = len([f for f in listdir(tmp) if isfile(join(tmp, f))])
assert file_no == end - start
shutil.rmtree(tmp)
def test_error_report(datadir):
"""Test FFmpeg error reporting."""
not_found = 'invalid_filename: No such file or directory'
is_dir = 'Is a directory'
with pytest.raises(MetadataExtractionExecutionError) as e:
ff_probe('invalid_filename', 'width')
assert not_found in repr(e.value)
assert not_found in e.value.error_message
with pytest.raises(MetadataExtractionExecutionError) as e:
ff_probe(datadir, 'width')
assert is_dir in repr(e.value)
assert is_dir in e.value.error_message
with pytest.raises(FrameExtractionExecutionError) as e:
ff_frames('invalid_filename', 10, 20, 2, 100, '')
assert not_found in repr(e.value)
assert not_found in e.value.error_message
