92 lines
3.6 KiB
Python
92 lines
3.6 KiB
Python
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# -*- coding: utf-8 -*-
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"""按 aigc-idea-impression 抽帧 SOP 提取视频关键帧（双因素 + 首尾 + 5s 长间隔补帧）。
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规避原 SOP bash 版的 bc 依赖与 Windows CRLF 坑：全部用 Python 调度 ffmpeg/ffprobe。
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用法：
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python extract_frames.py --dir <视频目录(自动找首个.mp4)> --out <帧输出目录> --ff <ffmpeg bin 目录>
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"""
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import argparse, glob, os, re, subprocess, sys
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def run(cmd):
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return subprocess.run(cmd, capture_output=True, text=True, encoding="utf-8", errors="replace")
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def probe(video, ffprobe):
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r = run([ffprobe, "-v", "error", "-select_streams", "v:0",
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"-show_entries", "stream=width,height", "-show_entries", "format=duration",
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"-of", "default=nk=1:nw=1", video])
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vals = [x.strip() for x in r.stdout.split("\n") if x.strip()]
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w = int(vals[0]); h = int(vals[1]); dur = float(vals[2])
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return w, h, dur
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def scene_times(video, vf, ffmpeg):
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"""对给定 -vf 跑一次 scene 检测，解析所有 pts_time。"""
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r = run([ffmpeg, "-i", video, "-vf", vf + ",showinfo", "-vsync", "vfr", "-f", "null", "-"])
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out = set()
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for line in r.stderr.splitlines():
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m = re.search(r"pts_time:([0-9.]+)", line)
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if m:
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out.add(round(float(m.group(1)), 4))
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return sorted(out)
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def main():
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ap = argparse.ArgumentParser()
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ap.add_argument("--dir", required=True, help="含 .mp4 的目录")
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ap.add_argument("--out", required=True, help="帧输出目录")
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ap.add_argument("--ff", default=r"D:\ComfyUI_windows\ffmpeg-8.0.1-full_build\bin",
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help="ffmpeg/ffprobe 所在 bin 目录")
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args = ap.parse_args()
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ffmpeg = os.path.join(args.ff, "ffmpeg.exe")
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ffprobe = os.path.join(args.ff, "ffprobe.exe")
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vids = sorted(glob.glob(os.path.join(args.dir, "*.mp4")))
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if not vids:
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print("✗ 目录里没有 .mp4：%s" % args.dir); sys.exit(1)
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video = vids[0]
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print("视频：%s" % video)
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w, h, dur = probe(video, ffprobe)
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print("分辨率=%dx%d 时长=%.2fs" % (w, h, dur))
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# 字幕区 = 底部 15%（横屏 B 站常用；竖屏改 1/4 即可）
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sh = max(1, int(h * 0.15)); sy = h - sh
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crop_vf = "crop=%d:%d:0:%d" % (w, sh, sy)
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t_a = scene_times(video, "select='gt(scene,0.3)'", ffmpeg) # ① 画面变化
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t_b = scene_times(video, "%s,select='gt(scene,0.1)'" % crop_vf, ffmpeg) # ② 字幕变化
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t_c = scene_times(video, "select='gt(scene,0.05)'", ffmpeg) # ③ 低阈值补漏
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print("scene 0.3=%d 字幕区 0.1=%d 0.05=%d" % (len(t_a), len(t_b), len(t_c)))
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times = sorted(set(t_a) | set(t_b) | set(t_c))
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times.append(0.0) # 首帧
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times.append(max(0.0, round(dur - 0.3, 3))) # 尾帧
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times = sorted(set(times))
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# ④ 长间隔强制补帧（>5s 补中点）
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filled = []
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for i, t in enumerate(times):
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filled.append(t)
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if i > 0:
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gap = t - times[i - 1]
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if gap > 5:
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filled.append(round((t + times[i - 1]) / 2, 3))
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times = sorted(set(filled))
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print("最终帧数（含首尾+补帧）：%d" % len(times))
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os.makedirs(args.out, exist_ok=True)
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for i, t in enumerate(times, 1):
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tt = t
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if t > dur:
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tt = max(0.0, dur - 0.3)
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outp = os.path.join(args.out, "c_%04d_%.3fs.jpg" % (i, t))
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r = run([ffmpeg, "-y", "-ss", "%.3f" % tt, "-i", video,
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"-frames:v", "1", "-q:v", "2", outp])
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if r.returncode != 0:
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print(" ✗ 帧 %d 失败：%s" % (i, r.stderr[-200:]))
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print("✓ 抽帧完成 → %s" % args.out)
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if __name__ == "__main__":
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main()
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