59 lines
2.9 KiB
Python
59 lines
2.9 KiB
Python
"""Verify actual rendered stages in the synthetic long-trial recordings.
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Copies of H.264 packets alone are insufficient evidence that clients saw a
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retry slate or a recovered channel. Compare decoded text pixels, not file names.
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"""
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import argparse
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import json
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from pathlib import Path
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import subprocess
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def pixels(ffmpeg, path, second=0):
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command = [ffmpeg, '-hide_banner', '-loglevel', 'error', '-nostdin', '-threads', '1', '-filter_threads', '1',
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'-ss', str(second), '-i', str(path), '-frames:v', '1', '-vf',
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'crop=1920:260:0:430,scale=640:86:flags=area', '-pix_fmt', 'gray', '-f', 'rawvideo', 'pipe:1']
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output = subprocess.run(command, capture_output=True, check=True, timeout=20).stdout
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if len(output) != 640 * 86:
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raise RuntimeError('Incomplete video frame')
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return output
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def difference(first, second):
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return sum(abs(a-b) for a, b in zip(first, second)) / len(first)
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def verify(root, ffmpeg):
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result = json.loads((root / 'result.json').read_text())
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if result['FailureSeconds'] != 75:
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raise ValueError('Use the long trial with the documented stage times')
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errors = {}
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for language in ('pl', 'en'):
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waiting = pixels(ffmpeg, root / (language + '-waiting-slate.ts'))
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retrying = pixels(ffmpeg, root / (language + '-retrying-slate.ts'))
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observed_waiting = pixels(ffmpeg, root / (language + '.mkv'), 1)
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observed_retrying = pixels(ffmpeg, root / (language + '.mkv'), 70)
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live = pixels(ffmpeg, root / (language + '.mkv'), 39)
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recovered = pixels(ffmpeg, root / (language + '.mkv'), 140)
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metrics = {'waiting_error': difference(waiting, observed_waiting),
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'retrying_error': difference(retrying, observed_retrying),
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'live_difference': difference(retrying, live),
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'recovered_difference': difference(retrying, recovered)}
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assert metrics['waiting_error'] < 0.5 and metrics['retrying_error'] < 0.5, metrics
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assert metrics['live_difference'] > 15 and metrics['recovered_difference'] > 15, metrics
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other = 'en' if language == 'pl' else 'pl'
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assert difference(observed_retrying, pixels(ffmpeg, root / (other + '-retrying-slate.ts'))) > 2
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errors[language] = {key: round(value, 4) for key, value in metrics.items()}
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result.update(RenderedWaitingVerified=True, RenderedRetryingVerified=True, RenderedLiveRecoveryVerified=True,
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RenderedPerViewerLanguageVerified=True, VisualErrorMetrics=errors)
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(root / 'result.json').write_text(json.dumps(result, indent=2) + '\n')
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print(json.dumps({'rendered_stages_verified': True, 'metrics': errors}))
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('--output', type=Path, required=True)
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parser.add_argument('--ffmpeg', default='/usr/lib/jellyfin-ffmpeg/ffmpeg')
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args = parser.parse_args()
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verify(args.output, args.ffmpeg)
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