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import os
import subprocess
def add_silence_to_audio_ffmpeg(audio_path, tmp_audio_path, silence_duration_s=0.5):
# 使用 ffmpeg 命令在音频前加上静音
cmd = [
'ffmpeg',
'-i', audio_path, # 输入音频文件路径
'-f', 'lavfi', # 使用 lavfi 虚拟输入设备生成静音
'-t', str(silence_duration_s), # 静音时长，单位秒
'-i', 'anullsrc=r=16000:cl=stereo', # 创建静音片段（假设音频为 stereo，采样率 44100）
'-filter_complex', '[1][0]concat=n=2:v=0:a=1[out]', # 合并静音和原音频
'-map', '[out]', # 输出合并后的音频
'-y', tmp_audio_path, # 输出文件路径
'-loglevel', 'error'
]
try:
subprocess.run(cmd, check=True, capture_output=True, text=True)
except subprocess.CalledProcessError as e:
raise RuntimeError(f"ffmpeg failed ({e.returncode}): {e.stderr.strip()}")
def convert_video_to_15fps_ffmpeg(video_path, output_path=None):
"""
Convert a video to 15 FPS using ffmpeg.
Parameters
----------
video_path : str
Path to the input .mp4 video.
output_path : str, optional
Path for the output video. If None, a new file will be created next to the input.
Returns
-------
str
The output video path.
"""
if not os.path.exists(video_path):
raise FileNotFoundError(f"Input video not found: {video_path}")
# Auto-generate output path if not provided
if output_path is None:
base, ext = os.path.splitext(video_path)
output_path = base + "_15fps.mp4"
cmd = [
"ffmpeg",
"-i", video_path,
"-filter:v", "fps=15", # Set frame rate
"-c:a", "copy", # Copy audio without re-encoding
"-y", output_path, # Overwrite output
"-loglevel", "error"
]
try:
subprocess.run(cmd, check=True, capture_output=True, text=True)
except subprocess.CalledProcessError as e:
raise RuntimeError(f"ffmpeg failed ({e.returncode}): {e.stderr.strip()}")
return output_path |