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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
import tempfile
import unittest
import pytest
from pytorchvideo.data.encoded_video import EncodedVideo
from pytorchvideo.data.encoded_video_pyav import EncodedVideoPyAV
from utils import temp_encoded_video, temp_encoded_video_with_audio
class TestEncodedVideo(unittest.TestCase):
# Clip sampling is end time exclusive so we need to add _EPS to sample
# all the frames of a video.
_EPS = 1e-9
def test_video_works(self):
num_frames = 11
fps = 5
with temp_encoded_video(num_frames=num_frames, fps=fps) as (file_name, data):
test_video = EncodedVideo.from_path(file_name)
self.assertAlmostEqual(test_video.duration, num_frames / fps)
# All frames (0 - test_video.duration seconds)
clip = test_video.get_clip(0, test_video.duration + self._EPS)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(data))
self.assertEqual(audio_samples, None)
# Half frames
clip = test_video.get_clip(0, test_video.duration / 2)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(data[:, : round(num_frames / 2)]))
self.assertEqual(audio_samples, None)
# No frames
clip = test_video.get_clip(test_video.duration + 1, test_video.duration + 3)
frames, audio_samples = clip["video"], clip["audio"]
self.assertEqual(frames, None)
self.assertEqual(audio_samples, None)
test_video.close()
def test_video_with_shorter_audio_works(self):
num_audio_samples = 8000
num_frames = 5
fps = 5
audio_rate = 8000
with temp_encoded_video_with_audio(
num_frames=num_frames,
fps=fps,
num_audio_samples=num_audio_samples,
audio_rate=audio_rate,
) as (file_name, video_data, audio_data):
test_video = EncodedVideo.from_path(file_name)
# Duration is max of both streams, therefore, the video duration will be expected.
self.assertEqual(test_video.duration, num_frames / fps)
# All audio (0 - 1 seconds)
clip = test_video.get_clip(0, test_video.duration + self._EPS)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(video_data))
self.assertTrue(audio_samples.equal(audio_data))
# Half frames
clip = test_video.get_clip(0, test_video.duration / 2)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(video_data[:, : num_frames // 2]))
self.assertTrue(audio_samples.equal(audio_data))
test_video.close()
def test_video_with_longer_audio_works(self):
audio_rate = 10000
fps = 5
num_frames = 5
num_audio_samples = 40000
with temp_encoded_video_with_audio(
num_frames=num_frames,
fps=fps,
num_audio_samples=num_audio_samples,
audio_rate=audio_rate,
) as (file_name, video_data, audio_data):
test_video = EncodedVideo.from_path(file_name)
# All audio
clip = test_video.get_clip(0, test_video.duration + self._EPS)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(video_data))
self.assertTrue(audio_samples.equal(audio_data))
# No frames (3 - 5 seconds)
clip = test_video.get_clip(test_video.duration + 1, test_video.duration + 2)
frames, audio_samples = clip["video"], clip["audio"]
self.assertEqual(frames, None)
self.assertEqual(audio_samples, None)
test_video.close()
def test_decode_audio_is_false(self):
audio_rate = 10000
fps = 5
num_frames = 5
num_audio_samples = 40000
with temp_encoded_video_with_audio(
num_frames=num_frames,
fps=fps,
num_audio_samples=num_audio_samples,
audio_rate=audio_rate,
) as (file_name, video_data, audio_data):
test_video = EncodedVideo.from_path(file_name, decode_audio=False)
# All audio
clip = test_video.get_clip(0, test_video.duration + self._EPS)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(video_data))
self.assertEqual(audio_samples, None)
test_video.close()
def test_file_api(self):
num_frames = 11
fps = 5
with temp_encoded_video(num_frames=num_frames, fps=fps) as (file_name, data):
with open(file_name, "rb") as f:
test_video = EncodedVideoPyAV(f)
self.assertAlmostEqual(test_video.duration, num_frames / fps)
clip = test_video.get_clip(0, test_video.duration + self._EPS)
frames, audio_samples = clip["video"], clip["audio"]
self.assertTrue(frames.equal(data))
self.assertEqual(audio_samples, None)
def test_open_video_failure(self):
with pytest.raises(FileNotFoundError):
test_video = EncodedVideo.from_path("non_existent_file.txt")
test_video.close()
def test_decode_video_failure(self):
with tempfile.NamedTemporaryFile(suffix=".mp4") as f:
f.write(b"This is not an mp4 file")
with pytest.raises(RuntimeError):
test_video = EncodedVideo.from_path(f.name)
test_video.close()
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