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* prevent short hls segments by extending clip backwards * clean up * snap to keyframe instead of arbitrarily subtracting time * formatting
62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
"""Utilities for media file inspection."""
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import subprocess as sp
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from frigate.const import DEFAULT_FFMPEG_VERSION
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FFPROBE_PATH = (
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f"/usr/lib/ffmpeg/{DEFAULT_FFMPEG_VERSION}/bin/ffprobe"
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if DEFAULT_FFMPEG_VERSION
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else "ffprobe"
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)
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def get_keyframe_before(path: str, offset_ms: int) -> int | None:
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"""Get the timestamp (ms) of the last keyframe at or before offset_ms.
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Uses ffprobe packet index to read keyframe positions from the mp4 file.
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Returns None if ffprobe fails or no keyframe is found before the offset.
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"""
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try:
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result = sp.run(
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[
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FFPROBE_PATH,
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"-select_streams",
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"v:0",
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"-show_entries",
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"packet=pts_time,flags",
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"-of",
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"csv=p=0",
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"-loglevel",
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"error",
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path,
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],
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capture_output=True,
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timeout=5,
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)
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except (sp.TimeoutExpired, FileNotFoundError):
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return None
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if result.returncode != 0:
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return None
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offset_s = offset_ms / 1000.0
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best_ms = None
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for line in result.stdout.decode().strip().splitlines():
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parts = line.strip().split(",")
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if len(parts) != 2:
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continue
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ts_str, flags = parts
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if "K" not in flags:
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continue
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try:
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ts = float(ts_str)
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except ValueError:
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continue
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if ts <= offset_s:
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best_ms = int(ts * 1000)
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else:
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break
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return best_ms
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