283 lines
9.8 KiB
Python
283 lines
9.8 KiB
Python
"""
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视频合成服务
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"""
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import os
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import subprocess
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import json
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import shlex
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from pathlib import Path
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from loguru import logger
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from typing import Optional
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class VideoService:
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def __init__(self):
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pass
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def _run_ffmpeg(self, cmd: list) -> bool:
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cmd_str = ' '.join(shlex.quote(str(c)) for c in cmd)
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logger.debug(f"FFmpeg CMD: {cmd_str}")
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try:
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# Synchronous call for BackgroundTasks compatibility
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result = subprocess.run(
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cmd,
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shell=False,
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capture_output=True,
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text=True,
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encoding='utf-8',
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)
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if result.returncode != 0:
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logger.error(f"FFmpeg Error: {result.stderr}")
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return False
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return True
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except Exception as e:
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logger.error(f"FFmpeg Exception: {e}")
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return False
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def _get_duration(self, file_path: str) -> float:
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# Synchronous call for BackgroundTasks compatibility
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# 使用参数列表形式避免 shell=True 的命令注入风险
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cmd = [
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'ffprobe', '-v', 'error',
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'-show_entries', 'format=duration',
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'-of', 'default=noprint_wrappers=1:nokey=1',
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file_path
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]
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try:
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result = subprocess.run(
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cmd,
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capture_output=True,
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text=True,
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)
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return float(result.stdout.strip())
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except Exception:
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return 0.0
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def mix_audio(
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self,
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voice_path: str,
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bgm_path: str,
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output_path: str,
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bgm_volume: float = 0.2
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) -> str:
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"""混合人声与背景音乐"""
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Path(output_path).parent.mkdir(parents=True, exist_ok=True)
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volume = max(0.0, min(float(bgm_volume), 1.0))
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filter_complex = (
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f"[0:a]volume=1.0[a0];"
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f"[1:a]volume={volume}[a1];"
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f"[a0][a1]amix=inputs=2:duration=first:dropout_transition=2:normalize=0[aout]"
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)
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cmd = [
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"ffmpeg", "-y",
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"-i", voice_path,
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"-stream_loop", "-1", "-i", bgm_path,
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"-filter_complex", filter_complex,
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"-map", "[aout]",
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"-c:a", "pcm_s16le",
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"-shortest",
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output_path,
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]
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if self._run_ffmpeg(cmd):
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return output_path
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raise RuntimeError("FFmpeg audio mix failed")
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async def compose(
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self,
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video_path: str,
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audio_path: str,
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output_path: str,
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subtitle_path: Optional[str] = None
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) -> str:
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"""合成视频"""
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# Ensure output dir
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Path(output_path).parent.mkdir(parents=True, exist_ok=True)
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video_duration = self._get_duration(video_path)
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audio_duration = self._get_duration(audio_path)
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# Audio loop if needed
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loop_count = 1
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if audio_duration > video_duration and video_duration > 0:
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loop_count = int(audio_duration / video_duration) + 1
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cmd = ["ffmpeg", "-y"]
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# Input video (stream_loop must be before -i)
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if loop_count > 1:
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cmd.extend(["-stream_loop", str(loop_count)])
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cmd.extend(["-i", video_path])
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# Input audio
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cmd.extend(["-i", audio_path])
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# Filter complex
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filter_complex = []
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# Subtitles (skip for now to mimic previous state or implement basic)
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# Previous state: subtitles disabled due to font issues
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# if subtitle_path: ...
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# Audio map with high quality encoding
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cmd.extend([
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"-c:v", "libx264",
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"-preset", "slow", # 慢速预设，更好的压缩效率
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"-crf", "18", # 高质量（与 LatentSync 一致）
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"-c:a", "aac",
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"-b:a", "192k", # 音频比特率
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"-shortest"
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])
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# Use audio from input 1
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cmd.extend(["-map", "0:v", "-map", "1:a"])
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cmd.append(output_path)
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if self._run_ffmpeg(cmd):
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return output_path
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else:
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raise RuntimeError("FFmpeg composition failed")
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def concat_videos(self, video_paths: list, output_path: str) -> str:
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"""使用 FFmpeg concat demuxer 拼接多个视频片段"""
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if not video_paths:
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raise ValueError("No video segments to concat")
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Path(output_path).parent.mkdir(parents=True, exist_ok=True)
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# 生成 concat list 文件
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list_path = Path(output_path).parent / f"{Path(output_path).stem}_concat.txt"
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with open(list_path, "w", encoding="utf-8") as f:
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for vp in video_paths:
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f.write(f"file '{vp}'\n")
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cmd = [
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"ffmpeg", "-y",
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"-f", "concat",
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"-safe", "0",
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"-i", str(list_path),
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"-c", "copy",
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output_path,
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]
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try:
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if self._run_ffmpeg(cmd):
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return output_path
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else:
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raise RuntimeError("FFmpeg concat failed")
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finally:
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try:
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list_path.unlink(missing_ok=True)
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except Exception:
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pass
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def split_audio(self, audio_path: str, start: float, end: float, output_path: str) -> str:
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"""用 FFmpeg 按时间范围切分音频"""
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Path(output_path).parent.mkdir(parents=True, exist_ok=True)
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duration = end - start
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if duration <= 0:
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raise ValueError(f"Invalid audio split range: start={start}, end={end}, duration={duration}")
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cmd = [
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"ffmpeg", "-y",
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"-ss", str(start),
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"-t", str(duration),
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"-i", audio_path,
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"-c", "copy",
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output_path,
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]
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if self._run_ffmpeg(cmd):
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return output_path
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raise RuntimeError(f"FFmpeg audio split failed: {start}-{end}")
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def get_resolution(self, file_path: str) -> tuple:
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"""获取视频分辨率，返回 (width, height)"""
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cmd = [
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'ffprobe', '-v', 'error',
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'-select_streams', 'v:0',
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'-show_entries', 'stream=width,height',
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'-of', 'csv=p=0',
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file_path
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]
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try:
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result = subprocess.run(cmd, capture_output=True, text=True, timeout=10)
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parts = result.stdout.strip().split(',')
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return (int(parts[0]), int(parts[1]))
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except Exception:
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return (0, 0)
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def prepare_segment(self, video_path: str, target_duration: float, output_path: str,
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target_resolution: tuple = None, source_start: float = 0.0) -> str:
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"""将素材视频裁剪或循环到指定时长（无音频）。
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target_resolution: (width, height) 如需统一分辨率则传入，否则保持原分辨率。
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source_start: 源视频截取起点（秒），默认 0。
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"""
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Path(output_path).parent.mkdir(parents=True, exist_ok=True)
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video_dur = self._get_duration(video_path)
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if video_dur <= 0:
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video_dur = target_duration
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# 可用时长 = 从 source_start 到视频结尾
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available = max(video_dur - source_start, 0.1)
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needs_loop = target_duration > available
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needs_scale = target_resolution is not None
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# 当需要循环且有 source_start 时，先裁剪出片段，再循环裁剪后的文件
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# 避免 stream_loop 循环整个视频（而不是从 source_start 开始的片段）
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actual_input = video_path
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trim_temp = None
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if needs_loop and source_start > 0:
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trim_temp = str(Path(output_path).parent / (Path(output_path).stem + "_trim_tmp.mp4"))
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trim_cmd = [
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"ffmpeg", "-y",
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"-ss", str(source_start),
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"-i", video_path,
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"-t", str(available),
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"-an",
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"-c:v", "libx264", "-preset", "fast", "-crf", "18",
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trim_temp,
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]
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if not self._run_ffmpeg(trim_cmd):
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raise RuntimeError(f"FFmpeg trim for loop failed: {video_path}")
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actual_input = trim_temp
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source_start = 0.0 # 已裁剪，不需要再 seek
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# 重新计算循环次数（基于裁剪后文件）
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available = self._get_duration(trim_temp) or available
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loop_count = int(target_duration / available) + 1 if needs_loop else 0
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cmd = ["ffmpeg", "-y"]
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if needs_loop:
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cmd.extend(["-stream_loop", str(loop_count)])
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if source_start > 0:
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cmd.extend(["-ss", str(source_start)])
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cmd.extend(["-i", actual_input, "-t", str(target_duration), "-an"])
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if needs_scale:
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w, h = target_resolution
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cmd.extend(["-vf", f"scale={w}:{h}:force_original_aspect_ratio=decrease,pad={w}:{h}:(ow-iw)/2:(oh-ih)/2"])
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# 需要循环、缩放或指定起点时必须重编码，否则用 stream copy 保持原画质
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if needs_loop or needs_scale or source_start > 0:
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cmd.extend(["-c:v", "libx264", "-preset", "fast", "-crf", "18"])
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else:
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cmd.extend(["-c:v", "copy"])
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cmd.append(output_path)
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try:
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if self._run_ffmpeg(cmd):
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return output_path
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raise RuntimeError(f"FFmpeg prepare_segment failed: {video_path}")
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finally:
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# 清理裁剪临时文件
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if trim_temp:
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try:
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Path(trim_temp).unlink(missing_ok=True)
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except Exception:
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pass
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