视频时间码

复制import subprocess
import json

# 使用 FFmpeg 叠加时间码水印到视频
input_video = "input.mp4"
output_video = "output_timestamp.mp4"

# drawtext 滤镜：显示当前时间戳（格式 HH:MM:SS.ms）
# fontfile 需替换为系统实际字体路径
filter_complex = (
    "drawtext=text='%{pts\\:gmtime:0\\:%H\\:%M\\:%S.\\%3N}':"
    "fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf:"
    "fontsize=24:fontcolor=white:box=1:boxcolor=black@0.5:"
    "x=10:y=10"
)

cmd = [
    "ffmpeg", "-i", input_video,
    "-vf", filter_complex,
    "-codec:a", "copy",  # 保持原音频不重新编码
    output_video
]

result = subprocess.run(cmd, capture_output=True, text=True)
if result.returncode != 0:
    print(f"FFmpeg error: {result.stderr}")
else:
    print(f"Generated: {output_video}")

复制package main

import (
	"fmt"
	"os/exec"
	"strings"
)

func main() {
	input := "input.mp4"
	output := "output_frame_number.mp4"

	// 使用 FFmpeg 叠加帧号（从 0 开始计数）
	filter := fmt.Sprintf(
		"drawtext=text='Frame: %%{n}':fontsize=28:fontcolor=yellow:box=1:boxcolor=black@0.5:x=w-tw-10:y=10",
	)

	cmd := exec.Command("ffmpeg",
		"-i", input,
		"-vf", filter,
		"-codec:a", "copy",
		output,
	)

	var stderr strings.Builder
	cmd.Stderr = &stderr

	if err := cmd.Run(); err != nil {
		fmt.Printf("FFmpeg failed: %v\n%s", err, stderr.String())
		return
	}
	fmt.Printf("Output: %s\n", output)
}

复制// 浏览器端：使用 Canvas 逐帧叠加时间码（模拟 FFmpeg 行为）
const video = document.createElement('video');
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');

video.src = 'input.mp4';
video.addEventListener('loadeddata', () => {
  canvas.width = video.videoWidth;
  canvas.height = video.videoHeight;
  
  // 每帧绘制时间戳
  function drawTimestamp() {
    ctx.drawImage(video, 0, 0);
    
    // 格式化当前时间（秒 → HH:MM:SS.mmm）
    const sec = video.currentTime;
    const h = Math.floor(sec / 3600);
    const m = Math.floor((sec % 3600) / 60);
    const s = Math.floor(sec % 60);
    const ms = Math.floor((sec % 1) * 1000);
    const timeStr = `${String(h).padStart(2,'0')}:${String(m).padStart(2,'0')}:${String(s).padStart(2,'0')}.${String(ms).padStart(3,'0')}`;
    
    ctx.font = '24px monospace';
    ctx.fillStyle = 'white';
    ctx.strokeStyle = 'black';
    ctx.lineWidth = 3;
    ctx.strokeText(timeStr, 10, 40);
    ctx.fillText(timeStr, 10, 40);
    
    requestAnimationFrame(drawTimestamp);
  }
  
  video.play();
  drawTimestamp();
});