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0a4deb9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | from moviepy import VideoFileClip, CompositeAudioClip
def shift_audio(video_path, output_path, shift_seconds=2.0):
print(f"🎬 正在加载视频: {video_path}")
# 加载视频和对应的音频
video = VideoFileClip(video_path)
audio = video.audio
# 核心逻辑：让音频“时间错位”
# shift_seconds > 0: 音频延后（开头静音）
# shift_seconds < 0: 音频提前（结尾静音）
print(f"⏱️ 正在将音频平移 {shift_seconds} 秒...")
if shift_seconds >= 0:
shifted_audio = CompositeAudioClip([audio.with_start(shift_seconds)]).with_duration(video.duration)
else:
advance_seconds = abs(shift_seconds)
if advance_seconds >= video.duration:
shifted_audio = CompositeAudioClip([]).with_duration(video.duration)
else:
trimmed_audio = audio.subclipped(advance_seconds, video.duration)
shifted_audio = CompositeAudioClip([trimmed_audio.with_start(0)]).with_duration(video.duration)
# 把错位的音频重新合成到视频上
final_video = video.with_audio(shifted_audio)
# 导出被“下毒”的对抗样本
print(f"💾 正在导出对抗样本: {output_path}")
final_video.write_videofile(output_path, codec="libx264", audio_codec="aac")
print("✅ 搞定！CT-DPO 负样本生成成功！")
# 示例1：音频往后 2 秒（开头静音）
shift_audio(
"/home/ubuntu/uag_oops_data/uag_oops/34 Funny Kid Nominees - FailArmy Hall Of Fame (May 2017)9.mp4",
"/home/ubuntu/poisoned_output_delay2.mp4",
shift_seconds=2.0,
)
# 示例2：音频往前 2 秒（结尾静音）
shift_audio(
"/home/ubuntu/uag_oops_data/uag_oops/34 Funny Kid Nominees - FailArmy Hall Of Fame (May 2017)9.mp4",
"/home/ubuntu/poisoned_output_early2.mp4",
shift_seconds=-2.0,
) |