ThePendulum
91390f751d
Confirms single-frame stepping is reliable: monotonic frame counter across steps, and the synthetic clip's 1-frame flash event lands on exactly one frame with clean neighbors. Also documents/works around three environment quirks hit along the way: locally-built libmpv not in ldconfig's cache, QApplication resetting LC_NUMERIC and breaking libmpv's locale requirement, and the playback-restart event not firing reliably after frame-step (switched to polling estimated_frame_number).
63 lines
1.9 KiB
Python
63 lines
1.9 KiB
Python
"""Standalone validation harness for build-order step 1: confirm python-mpv
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gives frame-accurate seeking before any of the rest of the UI is built.
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Steps frame-by-frame across the known flash event in the synthetic test clip
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(white flash at t=5.000s, frame 150 @ 30fps) and dumps a screenshot + reported
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position/frame-number per step, so the results can be inspected directly
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instead of trusted on faith.
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"""
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import sys
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import time
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from pathlib import Path
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from PyQt6.QtWidgets import QApplication
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sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
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from player_widget import PlayerWidget
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CLIP = str(Path(__file__).resolve().parent.parent / "test_media" / "sync_test_INSYNC.mp4")
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OUT_DIR = Path(__file__).resolve().parent.parent / "test_media" / "seek_validation"
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def main():
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OUT_DIR.mkdir(exist_ok=True)
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app = QApplication(sys.argv)
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w = PlayerWidget()
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w.resize(640, 480)
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w.show()
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app.processEvents()
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w.load(CLIP)
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app.processEvents()
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print(f"fps reported by mpv: {w.fps()}")
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# Land a few frames before the flash (frame 150 == t=5.000s), then
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# single-step across it.
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w.seek(4.900)
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app.processEvents()
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time.sleep(0.2)
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app.processEvents()
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results = []
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for i in range(8):
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pos = w.get_position()
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frame = w.get_estimated_frame()
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shot = OUT_DIR / f"step_{i:02d}_frame{frame}.png"
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w.screenshot(str(shot))
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results.append((i, pos, frame, shot.name))
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print(f"step {i}: time_pos={pos:.4f}s estimated_frame={frame} -> {shot.name}")
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w.step_frame(1)
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app.processEvents()
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w.shutdown()
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print("\nExpected: flash frame is frame index 150 (t=5.000-5.033s).")
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print("Check the dumped PNGs in test_media/seek_validation/ to confirm")
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print("exactly one frame is white/bright and it lines up with the")
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print("reported frame number close to 150.")
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if __name__ == "__main__":
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main()
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