463 lines
12 KiB
Go
463 lines
12 KiB
Go
package ffmpeg
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import (
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"fmt"
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"io"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"time"
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"github.com/drama-generator/backend/pkg/logger"
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)
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type FFmpeg struct {
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log *logger.Logger
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tempDir string
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}
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func NewFFmpeg(log *logger.Logger) *FFmpeg {
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tempDir := filepath.Join(os.TempDir(), "drama-video-merge")
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os.MkdirAll(tempDir, 0755)
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return &FFmpeg{
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log: log,
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tempDir: tempDir,
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}
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}
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type VideoClip struct {
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URL string
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Duration float64
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StartTime float64
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EndTime float64
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Transition map[string]interface{}
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}
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type MergeOptions struct {
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OutputPath string
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Clips []VideoClip
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}
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func (f *FFmpeg) MergeVideos(opts *MergeOptions) (string, error) {
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if len(opts.Clips) == 0 {
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return "", fmt.Errorf("no video clips to merge")
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}
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f.log.Infow("Starting video merge with trimming", "clips_count", len(opts.Clips))
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// 下载并裁剪所有视频片段
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trimmedPaths := make([]string, 0, len(opts.Clips))
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downloadedPaths := make([]string, 0, len(opts.Clips))
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for i, clip := range opts.Clips {
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// 下载原始视频
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downloadPath := filepath.Join(f.tempDir, fmt.Sprintf("download_%d_%d.mp4", time.Now().Unix(), i))
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localPath, err := f.downloadVideo(clip.URL, downloadPath)
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if err != nil {
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f.cleanup(downloadedPaths)
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f.cleanup(trimmedPaths)
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return "", fmt.Errorf("failed to download clip %d: %w", i, err)
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}
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downloadedPaths = append(downloadedPaths, localPath)
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// 裁剪视频片段（根据StartTime和EndTime）
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trimmedPath := filepath.Join(f.tempDir, fmt.Sprintf("trimmed_%d_%d.mp4", time.Now().Unix(), i))
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err = f.trimVideo(localPath, trimmedPath, clip.StartTime, clip.EndTime)
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if err != nil {
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f.cleanup(downloadedPaths)
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f.cleanup(trimmedPaths)
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return "", fmt.Errorf("failed to trim clip %d: %w", i, err)
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}
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trimmedPaths = append(trimmedPaths, trimmedPath)
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f.log.Infow("Clip trimmed",
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"index", i,
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"start", clip.StartTime,
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"end", clip.EndTime,
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"duration", clip.EndTime-clip.StartTime)
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}
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// 清理下载的原始文件
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f.cleanup(downloadedPaths)
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// 确保输出目录存在
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outputDir := filepath.Dir(opts.OutputPath)
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if err := os.MkdirAll(outputDir, 0755); err != nil {
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f.cleanup(trimmedPaths)
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return "", fmt.Errorf("failed to create output directory: %w", err)
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}
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// 合并裁剪后的视频片段（支持转场效果）
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err := f.concatenateVideosWithTransitions(trimmedPaths, opts.Clips, opts.OutputPath)
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// 清理裁剪后的临时文件
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f.cleanup(trimmedPaths)
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if err != nil {
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return "", fmt.Errorf("failed to concatenate videos: %w", err)
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}
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f.log.Infow("Video merge completed", "output", opts.OutputPath)
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return opts.OutputPath, nil
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}
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func (f *FFmpeg) downloadVideo(url, destPath string) (string, error) {
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f.log.Infow("Downloading video", "url", url, "dest", destPath)
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resp, err := http.Get(url)
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if err != nil {
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return "", fmt.Errorf("failed to download: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("bad status: %s", resp.Status)
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}
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out, err := os.Create(destPath)
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if err != nil {
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return "", fmt.Errorf("failed to create file: %w", err)
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}
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defer out.Close()
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_, err = io.Copy(out, resp.Body)
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if err != nil {
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return "", fmt.Errorf("failed to save file: %w", err)
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}
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return destPath, nil
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}
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func (f *FFmpeg) trimVideo(inputPath, outputPath string, startTime, endTime float64) error {
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f.log.Infow("Trimming video",
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"input", inputPath,
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"output", outputPath,
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"start", startTime,
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"end", endTime)
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// 如果startTime和endTime都为0，或者endTime <= startTime，直接复制整个视频
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if (startTime == 0 && endTime == 0) || endTime <= startTime {
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f.log.Infow("No valid trim range, copying entire video")
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cmd := exec.Command("ffmpeg",
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"-i", inputPath,
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"-c", "copy",
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"-y",
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outputPath,
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)
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output, err := cmd.CombinedOutput()
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if err != nil {
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f.log.Errorw("FFmpeg copy failed", "error", err, "output", string(output))
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return fmt.Errorf("ffmpeg copy failed: %w, output: %s", err, string(output))
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}
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f.log.Infow("Video copied successfully", "output", outputPath)
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return nil
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}
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// 使用FFmpeg裁剪视频
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// -i: 输入文件
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// -ss: 开始时间（秒）
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// -to: 结束时间（秒）或使用-t指定持续时间
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// -c copy: 直接复制流，不重新编码（速度快）
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// -avoid_negative_ts 1: 避免负时间戳问题
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var cmd *exec.Cmd
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if endTime > 0 {
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// 有明确的结束时间
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cmd = exec.Command("ffmpeg",
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"-i", inputPath,
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"-ss", fmt.Sprintf("%.2f", startTime),
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"-to", fmt.Sprintf("%.2f", endTime),
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"-c", "copy",
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"-avoid_negative_ts", "1",
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"-y", // 覆盖输出文件
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outputPath,
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)
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} else {
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// 只有开始时间，裁剪到视频末尾
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cmd = exec.Command("ffmpeg",
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"-i", inputPath,
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"-ss", fmt.Sprintf("%.2f", startTime),
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"-c", "copy",
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"-avoid_negative_ts", "1",
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"-y",
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outputPath,
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)
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}
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output, err := cmd.CombinedOutput()
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if err != nil {
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f.log.Errorw("FFmpeg trim failed", "error", err, "output", string(output))
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return fmt.Errorf("ffmpeg trim failed: %w, output: %s", err, string(output))
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}
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f.log.Infow("Video trimmed successfully", "output", outputPath)
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return nil
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}
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func (f *FFmpeg) concatenateVideosWithTransitions(inputPaths []string, clips []VideoClip, outputPath string) error {
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if len(inputPaths) == 0 {
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return fmt.Errorf("no input paths")
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}
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// 如果只有一个视频，直接复制
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if len(inputPaths) == 1 {
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f.log.Infow("Only one clip, copying directly")
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return f.copyFile(inputPaths[0], outputPath)
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}
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// 检查是否有转场效果
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hasTransitions := false
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for _, clip := range clips {
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if clip.Transition != nil && len(clip.Transition) > 0 {
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hasTransitions = true
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break
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}
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}
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// 如果没有转场效果，使用简单拼接
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if !hasTransitions {
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f.log.Infow("No transitions, using simple concatenation")
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return f.concatenateVideos(inputPaths, outputPath)
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}
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// 使用xfade滤镜添加转场效果
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f.log.Infow("Merging with transitions", "clips_count", len(inputPaths))
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return f.mergeWithXfade(inputPaths, clips, outputPath)
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}
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func (f *FFmpeg) concatenateVideos(inputPaths []string, outputPath string) error {
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// 创建文件列表
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listFile := filepath.Join(f.tempDir, fmt.Sprintf("filelist_%d.txt", time.Now().Unix()))
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defer os.Remove(listFile)
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var content strings.Builder
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for _, path := range inputPaths {
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content.WriteString(fmt.Sprintf("file '%s'\n", path))
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}
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if err := os.WriteFile(listFile, []byte(content.String()), 0644); err != nil {
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return fmt.Errorf("failed to create file list: %w", err)
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}
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// 使用FFmpeg合并视频
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// -f concat: 使用concat demuxer
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// -safe 0: 允许不安全的文件路径
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// -i: 输入文件列表
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// -c copy: 直接复制流，不重新编码（速度快）
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cmd := exec.Command("ffmpeg",
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"-f", "concat",
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"-safe", "0",
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"-i", listFile,
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"-c", "copy",
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"-y", // 覆盖输出文件
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outputPath,
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)
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output, err := cmd.CombinedOutput()
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if err != nil {
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f.log.Errorw("FFmpeg failed", "error", err, "output", string(output))
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return fmt.Errorf("ffmpeg execution failed: %w, output: %s", err, string(output))
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}
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f.log.Infow("FFmpeg concatenation completed", "output", outputPath)
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return nil
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}
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func (f *FFmpeg) mergeWithXfade(inputPaths []string, clips []VideoClip, outputPath string) error {
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// 使用xfade滤镜进行转场
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// 构建输入参数
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args := []string{}
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for _, path := range inputPaths {
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args = append(args, "-i", path)
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}
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// 构建filter_complex
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// 例如: [0:v][1:v]xfade=transition=fade:duration=1:offset=5[v01];[v01][2:v]xfade=transition=fade:duration=1:offset=10[out]
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var filterParts []string
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var offset float64 = 0
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for i := 0; i < len(inputPaths)-1; i++ {
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// 获取当前片段的时长
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clipDuration := clips[i].Duration
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if clips[i].EndTime > 0 && clips[i].StartTime >= 0 {
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clipDuration = clips[i].EndTime - clips[i].StartTime
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}
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// 获取转场类型和时长
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transitionType := "fade" // 默认淡入淡出
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transitionDuration := 1.0 // 默认转场时长为1秒
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if clips[i].Transition != nil {
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// 读取转场类型
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if tType, ok := clips[i].Transition["type"].(string); ok && tType != "" {
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transitionType = f.mapTransitionType(tType)
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f.log.Infow("Using transition type", "type", tType, "mapped", transitionType)
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}
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// 读取转场时长
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if tDuration, ok := clips[i].Transition["duration"].(float64); ok && tDuration > 0 {
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transitionDuration = tDuration
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}
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}
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// 计算转场开始的时间点
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// 转场在两个片段的交界处，从前一个片段结束前 transitionDuration/2 开始
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// 这样转场效果会平均分布在两个片段的交界处
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offset += clipDuration - (transitionDuration / 2)
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if offset < 0 {
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offset = 0
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}
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f.log.Infow("Transition settings",
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"clip_index", i,
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"type", transitionType,
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"duration", transitionDuration,
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"offset", offset,
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"clip_duration", clipDuration)
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var inputLabel, outputLabel string
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if i == 0 {
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inputLabel = fmt.Sprintf("[0:v][1:v]")
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} else {
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inputLabel = fmt.Sprintf("[v%02d][%d:v]", i-1, i+1)
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}
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if i == len(inputPaths)-2 {
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outputLabel = "[outv]"
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} else {
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outputLabel = fmt.Sprintf("[v%02d]", i)
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}
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filterPart := fmt.Sprintf("%sxfade=transition=%s:duration=%.1f:offset=%.1f%s",
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inputLabel, transitionType, transitionDuration, offset, outputLabel)
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filterParts = append(filterParts, filterPart)
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}
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filterComplex := strings.Join(filterParts, ";")
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// 音频处理：直接concat连接，不做交叉淡入淡出
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// 这样可以避免音频提前播放的问题
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var audioConcat strings.Builder
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for i := 0; i < len(inputPaths); i++ {
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audioConcat.WriteString(fmt.Sprintf("[%d:a]", i))
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}
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audioConcat.WriteString(fmt.Sprintf("concat=n=%d:v=0:a=1[outa]", len(inputPaths)))
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fullFilter := filterComplex + ";" + audioConcat.String()
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// 构建完整命令
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args = append(args,
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"-filter_complex", fullFilter,
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"-map", "[outv]",
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"-map", "[outa]",
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"-c:v", "libx264",
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"-preset", "medium",
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"-crf", "23",
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"-c:a", "aac",
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"-b:a", "128k",
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"-y",
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outputPath,
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)
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f.log.Infow("Running FFmpeg with transitions", "filter", fullFilter)
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cmd := exec.Command("ffmpeg", args...)
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output, err := cmd.CombinedOutput()
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if err != nil {
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f.log.Errorw("FFmpeg xfade failed", "error", err, "output", string(output))
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return fmt.Errorf("ffmpeg xfade failed: %w, output: %s", err, string(output))
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}
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f.log.Infow("Video merged with transitions successfully")
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return nil
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}
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func (f *FFmpeg) mapTransitionType(transType string) string {
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// 将前端传入的转场类型映射为FFmpeg xfade支持的类型
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// FFmpeg xfade支持的完整转场列表: https://ffmpeg.org/ffmpeg-filters.html#xfade
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switch strings.ToLower(transType) {
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// 淡入淡出类
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case "fade", "fadein", "fadeout":
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return "fade"
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case "fadeblack":
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return "fadeblack"
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case "fadewhite":
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return "fadewhite"
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case "fadegrays":
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return "fadegrays"
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// 滑动类
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case "slideleft":
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return "slideleft"
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case "slideright":
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return "slideright"
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case "slideup":
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return "slideup"
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case "slidedown":
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return "slidedown"
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// 擦除类
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case "wipeleft":
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return "wipeleft"
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case "wiperight":
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return "wiperight"
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case "wipeup":
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return "wipeup"
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case "wipedown":
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return "wipedown"
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// 圆形类
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case "circleopen":
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return "circleopen"
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case "circleclose":
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return "circleclose"
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// 矩形打开/关闭类
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case "horzopen":
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return "horzopen"
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case "horzclose":
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return "horzclose"
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case "vertopen":
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return "vertopen"
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case "vertclose":
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return "vertclose"
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// 其他特效
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case "dissolve":
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return "dissolve"
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case "distance":
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return "distance"
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case "pixelize":
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return "pixelize"
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default:
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return "fade" // 默认淡入淡出
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}
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}
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func (f *FFmpeg) copyFile(src, dst string) error {
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cmd := exec.Command("cp", src, dst)
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output, err := cmd.CombinedOutput()
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if err != nil {
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f.log.Errorw("File copy failed", "error", err, "output", string(output))
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return fmt.Errorf("copy failed: %w", err)
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}
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return nil
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}
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func (f *FFmpeg) cleanup(paths []string) {
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for _, path := range paths {
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if err := os.Remove(path); err != nil {
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f.log.Warnw("Failed to cleanup file", "path", path, "error", err)
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}
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}
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}
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func (f *FFmpeg) CleanupTempDir() error {
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return os.RemoveAll(f.tempDir)
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}
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