241 lines
9.0 KiB
Go
241 lines
9.0 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"io/fs"
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"log"
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"os/exec"
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"path/filepath"
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"regexp"
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"sort"
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"strconv"
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"strings"
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)
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// Movie 电影结构
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type Movie struct {
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Name string `json:"filename"` // Original filename of the movie, e.g., "video1.mp4"
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Image string `json:"image"` // Corresponding image filename, e.g., "video1.png"
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Duration int `json:"duration"` // Duration in minutes
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TimeCategory string `json:"time_category"` // 分类名称, e.g., "15min", "30min"
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VideoPath string `json:"-"` // Full path to the video file, used for ffmpeg
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}
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var movies []Movie // This will store all movies
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var IsRemakePNG = false // Set to true to regenerate all PNGs
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func getVideoDuration(videoPath string) (float64, error) {
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// 使用ffmpeg获取视频信息
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cmd := exec.Command("ffmpeg", "-i", videoPath)
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var stderr bytes.Buffer
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cmd.Stderr = &stderr
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_ = cmd.Run() // 忽略错误，因为ffmpeg在没有输出文件时会返回错误
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// 解析ffmpeg输出的时长信息
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output := stderr.String()
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re := regexp.MustCompile(`Duration: (\d{2}):(\d{2}):(\d{2}\.\d{2})`)
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matches := re.FindStringSubmatch(output)
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if len(matches) < 4 {
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// Try to find duration even if format is slightly different (e.g. no milliseconds)
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reAlt := regexp.MustCompile(`Duration: (\d{2}):(\d{2}):(\d{2})`)
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matches = reAlt.FindStringSubmatch(output)
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if len(matches) < 4 {
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return 0, fmt.Errorf("duration not found in ffmpeg output for %s. Output: %s", filepath.Base(videoPath), output)
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}
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// Add .00 for consistency if seconds has no decimal part
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matches[3] += ".00"
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}
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// 将时间转换为秒
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hours, errH := strconv.ParseFloat(matches[1], 64)
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minutes, errM := strconv.ParseFloat(matches[2], 64)
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seconds, errS := strconv.ParseFloat(matches[3], 64)
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if errH != nil || errM != nil || errS != nil {
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return 0, fmt.Errorf("error parsing time components from ffmpeg output: %v, %v, %v", errH, errM, errS)
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}
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duration := hours*3600 + minutes*60 + seconds
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return duration, nil
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}
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func initMovie() {
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// movieDict stores movies for which thumbnails might need to be generated.
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// Key: base filename without extension (e.g., "video1")
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// Value: *Movie object (initially with Name as full path to video, Duration updated later)
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var movieDict map[string]*Movie = make(map[string]*Movie)
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// Glob for all files in "movie/" directory to check for existing PNGs
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allFiles, err := filepath.Glob("movie/*")
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if err != nil {
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log.Printf("Error globbing movie directory: %v", err)
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// Decide if you want to return or continue with an empty list
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}
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// This loop is to determine which videos need thumbnails.
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// If a video `video.mp4` exists but `video.png` also exists,
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// `video.mp4` is removed from `movieDict` unless `IsRemakePNG` is true.
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for _, fullPath := range allFiles {
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baseWithExt := filepath.Base(fullPath)
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ext := filepath.Ext(baseWithExt)
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baseName := strings.TrimSuffix(baseWithExt, ext) // Filename without extension
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if ext == ".png" {
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// If it's a PNG, check if its corresponding video is in the dict
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if movieEntry, ok := movieDict[baseName]; ok {
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if !IsRemakePNG {
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// PNG exists and we are not remaking, so remove video from thumbnail generation list
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log.Printf("Thumbnail %s already exists. Skipping generation for %s.", baseWithExt, movieEntry.VideoPath)
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delete(movieDict, baseName)
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}
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}
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} else if ext != "" && ext != ".db" { // Assume other non-empty extensions are videos
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// If it's a video file (or any non-PNG, non-empty extension file)
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if _, ok := movieDict[baseName]; !ok {
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// If not already processed (e.g. by a .png file check) and not forced remake
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movieDict[baseName] = &Movie{VideoPath: fullPath} // Store full path for ffmpeg
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} else if IsRemakePNG {
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// If it was already there (e.g. from a PNG that we decided to remake), ensure VideoPath is set
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movieDict[baseName].VideoPath = fullPath
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}
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}
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}
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// Reset the global movies slice
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movies = []Movie{}
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// Walk through the movie directory to process video files
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err = filepath.WalkDir("./movie", func(path string, d fs.DirEntry, err error) error {
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if err != nil {
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log.Printf("Error accessing path %q: %v\n", path, err)
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return err
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}
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if d.IsDir() || filepath.Ext(d.Name()) == ".png" || filepath.Ext(d.Name()) == ".db" { // Skip directories, PNGs, and DB files
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return nil
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}
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videoFileName := d.Name() // e.g., "video1.mp4"
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baseNameWithoutExt := strings.TrimSuffix(videoFileName, filepath.Ext(videoFileName))
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durationSec, err := getVideoDuration(path)
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if err != nil {
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// log.Printf("Error getting duration for %s: %v. Skipping this file.", videoFileName, err)
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// Remove from movieDict if it was there, as we can't process it
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delete(movieDict, baseNameWithoutExt)
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return nil // Continue with next file
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}
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durationMin := int(durationSec / 60.0)
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var timeCat string
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if durationMin <= 15 {
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timeCat = "15min"
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} else if durationMin <= 30 {
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timeCat = "30min"
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} else if durationMin <= 60 {
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timeCat = "60min"
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} else {
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timeCat = "大于60min"
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}
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movie := Movie{
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Name: videoFileName,
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Image: baseNameWithoutExt + ".png",
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Duration: durationMin,
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TimeCategory: timeCat,
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VideoPath: path, // Store full path
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}
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movies = append(movies, movie)
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// If this movie base name is in movieDict (meaning it needs/might need a thumbnail),
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// update its duration.
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if mEntry, ok := movieDict[baseNameWithoutExt]; ok {
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mEntry.Duration = movie.Duration // Update duration for thumbnail filter logic
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// Ensure VideoPath in movieDict is the one we just processed (it should be)
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mEntry.VideoPath = path
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mEntry.Name = movie.Name // Also update Name for logging in thumbnail part
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}
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return nil
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})
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if err != nil {
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log.Printf("Error walking the path ./movie: %v\n", err)
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}
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// Sort the global movies list.
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// First by custom time category order, then by duration within that category.
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categoryOrderMap := map[string]int{
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"15min": 0,
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"30min": 1,
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"60min": 2,
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"大于60min": 3,
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}
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sort.Slice(movies, func(i, j int) bool {
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catOrderI := categoryOrderMap[movies[i].TimeCategory]
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catOrderJ := categoryOrderMap[movies[j].TimeCategory]
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if catOrderI != catOrderJ {
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return catOrderI < catOrderJ
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}
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return movies[i].Duration < movies[j].Duration
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})
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// Generate thumbnails for movies in movieDict
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// These are the movies for which PNGs didn't exist or IsRemakePNG is true
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for key, movieToProcess := range movieDict {
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if movieToProcess.VideoPath == "" {
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// log.Printf("Skipping thumbnail for %s, VideoPath is empty (likely only PNG found and no corresponding video processed).", key)
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continue
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}
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// movieToProcess.Duration should have been updated by the WalkDir logic.
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// If a video was in movieDict but not found/processed by WalkDir, its Duration might be 0.
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if movieToProcess.Duration == 0 && movieToProcess.Name != "" { // Name check to avoid new entries
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// Try to get duration again if it's missing, might happen if it was added to dict but WalkDir failed for it
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// Or if the logic for updating movieDict was missed for some edge case.
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// For simplicity, we assume duration is now correctly populated from WalkDir pass.
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log.Printf("Warning: Duration for %s (path: %s) is 0, thumbnail filter might be suboptimal.", movieToProcess.Name, movieToProcess.VideoPath)
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}
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log.Printf("Generating thumbnail for: %s (Duration: %d min, Path: %s)", movieToProcess.Name, movieToProcess.Duration, movieToProcess.VideoPath)
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var filter string
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// Use movieToProcess.Duration for filter logic
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if movieToProcess.Duration <= 2 {
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filter = "select='isnan(prev_selected_t)+gte(t-prev_selected_t\\,5)',scale=320:180,tile=3x3"
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} else if movieToProcess.Duration <= 5 {
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filter = "select='isnan(prev_selected_t)+gte(t-prev_selected_t\\,10)',scale=320:180,tile=3x3"
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} else if movieToProcess.Duration <= 30 {
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filter = "select='isnan(prev_selected_t)+gte(t-prev_selected_t\\,20)',scale=320:180,tile=3x3"
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} else if movieToProcess.Duration <= 60 {
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filter = "select='isnan(prev_selected_t)+gte(t-prev_selected_t\\,35)',scale=320:180,tile=3x3"
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} else { // duration > 60
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filter = "select='isnan(prev_selected_t)+gte(t-prev_selected_t\\,60)',scale=320:180,tile=3x3"
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}
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outputImagePath := filepath.Join("movie", key+".png")
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cmd := exec.Command("ffmpeg",
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"-i", movieToProcess.VideoPath, // Use full path to video
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"-vf", filter,
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"-frames:v", "1",
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"-q:v", "3", // Quality for JPEG/PNG, usually 2-5 is good for -qscale:v
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"-y", // Overwrite output files without asking
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outputImagePath,
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)
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var stderr bytes.Buffer
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cmd.Stderr = &stderr
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if err := cmd.Run(); err != nil {
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log.Printf("Error generating thumbnail for %s (Duration: %d min): %v\nStderr: %s",
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movieToProcess.VideoPath, movieToProcess.Duration, err, stderr.String())
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// Consider whether to panic or just log
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// panic(fmt.Errorf("could not generate frame %s %d. Error: %v. Stderr: %s", movieToProcess.VideoPath, movieToProcess.Duration, err, stderr.String()))
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} else {
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log.Printf("Successfully generated thumbnail: %s", outputImagePath)
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}
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}
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}
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