6c760b5e2e
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- Download full audio as Blob on mount so seeking is instant (no network range-requests) - Remove readyState guard from playAt() that was silently blocking seek attempts - Add disabled/ready state to SessionReel for reliable click-to-seek - Generate 48kbps Opus playback file during extraction (~65MB for 3hrs vs 1.5GB lossless) - Serve Opus first in audio endpoint, then original upload, then extracted WAV - Delete original upload after successful transcription to reclaim storage - Reorder extract_audio checks so retry works without the original file - Fix Back links on Speakers and Notes pages to go to home
63 lines
2.4 KiB
Python
63 lines
2.4 KiB
Python
import subprocess
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from pathlib import Path
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from ..errors import AudioExtractionError
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from ..logging_config import get_logger
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log = get_logger(__name__)
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def extract_audio(video_path: Path, audio_path: Path) -> Path:
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"""Extract 16kHz mono wav from any video/audio container."""
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if audio_path.exists():
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log.info("Audio already extracted at %s, skipping", audio_path)
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return audio_path
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if not video_path.exists():
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raise AudioExtractionError(f"Uploaded file not found on disk at {video_path}. It may not have finished uploading, or the upload volume isn't mounted correctly.")
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log.info("Extracting audio: %s -> %s", video_path, audio_path)
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result = subprocess.run(
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[
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"ffmpeg", "-y", "-i", str(video_path),
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"-vn", "-acodec", "pcm_s16le", "-ar", "16000", "-ac", "1",
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str(audio_path),
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],
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capture_output=True, text=True,
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)
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if result.returncode != 0:
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# surface ffmpeg's own error line rather than the whole verbose log
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stderr_tail = "\n".join(result.stderr.strip().splitlines()[-5:])
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raise AudioExtractionError(
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f"ffmpeg failed to extract audio (exit code {result.returncode}). "
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f"This usually means the file is corrupt or not a supported format. Last output:\n{stderr_tail}"
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)
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return audio_path
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def generate_playback_audio(video_path: Path, playback_path: Path) -> Path | None:
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"""Generate a compressed Opus file for browser playback (~48 kbps).
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This is done alongside the WAV extraction so the frontend can download a
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small file for instant-seeking Blob playback. Existing sessions that lack
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the Opus file will fall back to the original upload or the extracted WAV.
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"""
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if playback_path.exists():
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log.info("Playback audio already exists at %s, skipping", playback_path)
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return playback_path
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log.info("Generating playback audio: %s -> %s", video_path, playback_path)
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result = subprocess.run(
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[
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"ffmpeg", "-y", "-i", str(video_path),
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"-vn", "-c:a", "libopus", "-b:a", "48k",
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str(playback_path),
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],
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capture_output=True, text=True,
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)
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if result.returncode != 0:
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stderr_tail = "\n".join(result.stderr.strip().splitlines()[-5:])
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log.warning("Failed to generate playback audio (non-fatal): %s", stderr_tail)
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return None
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return playback_path
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