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test_videoapi.py
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import collections
import os
import urllib
import pytest
import torch
import torchvision
from pytest import approx
from torchvision.datasets.utils import download_url
from torchvision.io import _HAS_VIDEO_OPT, VideoReader
try:
import av
# Do a version test too
torchvision.io.video._check_av_available()
except ImportError:
av = None
VIDEO_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "assets", "videos")
CheckerConfig = ["duration", "video_fps", "audio_sample_rate"]
GroundTruth = collections.namedtuple("GroundTruth", " ".join(CheckerConfig))
def fate(name, path="."):
"""Download and return a path to a sample from the FFmpeg test suite.
See the `FFmpeg Automated Test Environment <https://www.ffmpeg.org/fate.html>`_
"""
file_name = name.split("/")[1]
download_url("http://fate.ffmpeg.org/fate-suite/" + name, path, file_name)
return os.path.join(path, file_name)
test_videos = {
"RATRACE_wave_f_nm_np1_fr_goo_37.avi": GroundTruth(duration=2.0, video_fps=30.0, audio_sample_rate=None),
"SchoolRulesHowTheyHelpUs_wave_f_nm_np1_ba_med_0.avi": GroundTruth(
duration=2.0, video_fps=30.0, audio_sample_rate=None
),
"TrumanShow_wave_f_nm_np1_fr_med_26.avi": GroundTruth(duration=2.0, video_fps=30.0, audio_sample_rate=None),
"v_SoccerJuggling_g23_c01.avi": GroundTruth(duration=8.0, video_fps=29.97, audio_sample_rate=None),
"v_SoccerJuggling_g24_c01.avi": GroundTruth(duration=8.0, video_fps=29.97, audio_sample_rate=None),
"R6llTwEh07w.mp4": GroundTruth(duration=10.0, video_fps=30.0, audio_sample_rate=44100),
"SOX5yA1l24A.mp4": GroundTruth(duration=11.0, video_fps=29.97, audio_sample_rate=48000),
"WUzgd7C1pWA.mp4": GroundTruth(duration=11.0, video_fps=29.97, audio_sample_rate=48000),
}
@pytest.mark.skipif(_HAS_VIDEO_OPT is False, reason="Didn't compile with ffmpeg")
class TestVideoApi:
@pytest.mark.skipif(av is None, reason="PyAV unavailable")
def test_frame_reading(self):
for test_video, config in test_videos.items():
full_path = os.path.join(VIDEO_DIR, test_video)
av_reader = av.open(full_path)
if av_reader.streams.video:
video_reader = VideoReader(full_path, "video")
for av_frame in av_reader.decode(av_reader.streams.video[0]):
vr_frame = next(video_reader)
assert float(av_frame.pts * av_frame.time_base) == approx(vr_frame["pts"], abs=0.1)
av_array = torch.tensor(av_frame.to_rgb().to_ndarray()).permute(2, 0, 1)
vr_array = vr_frame["data"]
mean_delta = torch.mean(torch.abs(av_array.float() - vr_array.float()))
# on average the difference is very small and caused
# by decoding (around 1%)
# TODO: asses empirically how to set this? atm it's 1%
# averaged over all frames
assert mean_delta.item() < 2.5
av_reader = av.open(full_path)
if av_reader.streams.audio:
video_reader = VideoReader(full_path, "audio")
for av_frame in av_reader.decode(av_reader.streams.audio[0]):
vr_frame = next(video_reader)
assert float(av_frame.pts * av_frame.time_base) == approx(vr_frame["pts"], abs=0.1)
av_array = torch.tensor(av_frame.to_ndarray()).permute(1, 0)
vr_array = vr_frame["data"]
max_delta = torch.max(torch.abs(av_array.float() - vr_array.float()))
# we assure that there is never more than 1% difference in signal
assert max_delta.item() < 0.001
def test_metadata(self):
"""
Test that the metadata returned via pyav corresponds to the one returned
by the new video decoder API
"""
for test_video, config in test_videos.items():
full_path = os.path.join(VIDEO_DIR, test_video)
reader = VideoReader(full_path, "video")
reader_md = reader.get_metadata()
assert config.video_fps == approx(reader_md["video"]["fps"][0], abs=0.0001)
assert config.duration == approx(reader_md["video"]["duration"][0], abs=0.5)
def test_seek_start(self):
for test_video, config in test_videos.items():
full_path = os.path.join(VIDEO_DIR, test_video)
video_reader = VideoReader(full_path, "video")
num_frames = 0
for frame in video_reader:
num_frames += 1
# now seek the container to 0 and do it again
# It's often that starting seek can be inprecise
# this way and it doesn't start at 0
video_reader.seek(0)
start_num_frames = 0
for frame in video_reader:
start_num_frames += 1
assert start_num_frames == num_frames
# now seek the container to < 0 to check for unexpected behaviour
video_reader.seek(-1)
start_num_frames = 0
for frame in video_reader:
start_num_frames += 1
assert start_num_frames == num_frames
def test_accurateseek_middle(self):
for test_video, config in test_videos.items():
full_path = os.path.join(VIDEO_DIR, test_video)
stream = "video"
video_reader = VideoReader(full_path, stream)
md = video_reader.get_metadata()
duration = md[stream]["duration"][0]
if duration is not None:
num_frames = 0
for frame in video_reader:
num_frames += 1
video_reader.seek(duration / 2)
middle_num_frames = 0
for frame in video_reader:
middle_num_frames += 1
assert middle_num_frames < num_frames
assert middle_num_frames == approx(num_frames // 2, abs=1)
video_reader.seek(duration / 2)
frame = next(video_reader)
lb = duration / 2 - 1 / md[stream]["fps"][0]
ub = duration / 2 + 1 / md[stream]["fps"][0]
assert (lb <= frame["pts"]) and (ub >= frame["pts"])
def test_fate_suite(self):
# TODO: remove the try-except statement once the connectivity issues are resolved
try:
video_path = fate("sub/MovText_capability_tester.mp4", VIDEO_DIR)
except (urllib.error.URLError, ConnectionError) as error:
pytest.skip(f"Skipping due to connectivity issues: {error}")
vr = VideoReader(video_path)
metadata = vr.get_metadata()
assert metadata["subtitles"]["duration"] is not None
os.remove(video_path)
if __name__ == "__main__":
pytest.main([__file__])