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# styletest: ignore E501
""" Tests specific to parsing ffmpeg info.
"""
import pytest
import imageio
import sys
imageio_ffmpeg = pytest.importorskip(
"imageio_ffmpeg", reason="imageio-ffmpeg is not installed"
)
try:
imageio_ffmpeg.get_ffmpeg_version()
except RuntimeError:
pytest.skip("No compatible FFMPEG binary could be found.", allow_module_level=True)
def dedent(text, dedent=8):
lines = [line[dedent:] for line in text.splitlines()]
text = "\n".join(lines)
return text.strip() + "\n"
def test_webcam_parse_device_names():
# Ensure that the device list parser returns all video devices (issue #283)
sample = dedent(
r"""
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 6.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynthlibswresample 2. 3.100 / 2. 3.100
libpostproc 54. 1.100 / 54. 1.100
[dshow @ 039a7e20] DirectShow video devices (some may be both video and audio devices)
[dshow @ 039a7e20] "AVerMedia USB Polaris Analog Capture"
[dshow @ 039a7e20] Alternative name "@device_pnp_\\?\usb#vid_07ca&pid_c039&mi_01#8&55f1102&0&0001#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{9b365890-165f-11d0-a195-0020afd156e4}"
[dshow @ 039a7e20] "Lenovo EasyCamera"
[dshow @ 039a7e20] Alternative name "@device_pnp_\\?\usb#vid_04f2&pid_b50f&mi_00#6&bbc4ae1&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 039a7e20] DirectShow audio devices
[dshow @ 039a7e20] "Microphone (2- USB Multimedia Audio Device)"
[dshow @ 039a7e20] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{73C17834-AA57-4CA1-847A-6BBEB1E0F2E6}"
[dshow @ 039a7e20] "SPDIF Interface (Multimedia Audio Device)"
[dshow @ 039a7e20] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{617B63FB-CFC0-4D10-AE30-42A66CAF6A4E}"
dummy: Immediate exit requested
"""
)
# Parse the sample
device_names = imageio.plugins.ffmpeg.parse_device_names(sample)
# Assert that the device_names list has the correct length
assert len(device_names) == 2
@pytest.mark.skipif("__pypy__" in sys.builtin_module_names, reason="Skipping on PYPI")
def test_overload_fps(test_images):
# Native
r = imageio.get_reader(test_images / "cockatoo.mp4")
assert r.count_frames() == 280 # native
assert int(r._meta["fps"] * r._meta["duration"] + 0.5) == 280
ims = [1 for _ in r]
assert len(ims) in (280, 281)
# Less
r = imageio.get_reader(test_images / "cockatoo.mp4", fps=8)
ims = [1 for _ in r]
assert len(ims) == 114
# More
r = imageio.get_reader(test_images / "cockatoo.mp4", fps=24)
ims = [1 for _ in r]
assert len(ims) in (336, 337)
# Do we calculate nframes correctly? To be fair, the reader wont try to
# read beyond what it thinks how many frames it has. But this at least
# makes sure that this works.
for fps in (8.0, 8.02, 8.04, 8.06, 8.08):
r = imageio.get_reader(test_images / "cockatoo.mp4", fps=fps)
n = int(fps * r._meta["duration"] + 0.5)
i = 0
try:
while True:
r.get_next_data()
i += 1
except (StopIteration, IndexError):
pass
assert n - 2 <= i <= n + 2
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