ThePendulum
f634dda5bb
sync_logic.py: pure delay_ms computation with the documented sign convention. Caught and fixed a sign error in my own test-fixture ground-truth doc while writing the unit tests: the audio+350ms fixture actually requires delay_ms=-350 (delay video), not +350, since the audio is already the late one. ffmpeg_export.py: ports ffdelay's two-branch command structure (offset video input vs audio input depending on delay_ms sign) plus its documented quirks (leading-zero float formatting, -ss/-t applied to both inputs for clip mode, non-fatal stream-copy warnings surfaced via stderr rather than swallowed). Added an end-to-end integration test (scripts/test_export_roundtrip.py) that independently re-detects event timing in the exported output via ffmpeg scene-change/silence detection (not the same code path used to build the export) and confirms both the positive- and negative-delay branches bring drift down from ~350ms to under 1ms.
39 lines
1.6 KiB
Python
39 lines
1.6 KiB
Python
import sys
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import unittest
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from pathlib import Path
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sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
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from sync_logic import compute_offset
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class TestComputeOffset(unittest.TestCase):
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def test_audio_ahead_needs_delay(self):
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# Flash seen at 5.000s, beep heard at 4.500s -> audio is running
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# ahead of video, so audio needs to be delayed to catch up.
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offset = compute_offset(video_mark_sec=5.000, audio_mark_sec=4.500)
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self.assertAlmostEqual(offset.delay_ms, 500.0)
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self.assertEqual(offset.target, "audio")
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def test_audio_behind_needs_video_delay(self):
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# This is our synthetic test fixture: audio was shifted +350ms
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# later than video, so the fix is to delay video to catch up to
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# the already-late audio -- NOT to delay audio further.
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offset = compute_offset(video_mark_sec=5.000, audio_mark_sec=5.350)
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self.assertAlmostEqual(offset.delay_ms, -350.0)
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self.assertEqual(offset.target, "video")
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def test_already_in_sync(self):
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offset = compute_offset(video_mark_sec=5.000, audio_mark_sec=5.000)
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self.assertEqual(offset.delay_ms, 0.0)
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self.assertEqual(offset.target, "none")
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def test_describe_formatting(self):
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self.assertIn("audio will be delayed", compute_offset(5.5, 5.0).describe())
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self.assertIn("video will be delayed", compute_offset(5.0, 5.5).describe())
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self.assertIn("+500", compute_offset(5.5, 5.0).describe())
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self.assertIn("-500", compute_offset(5.0, 5.5).describe())
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if __name__ == "__main__":
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unittest.main()
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