fix: 修复最大片段时长限制功能
问题分析： - 场景检测结果没有正确转换为SceneSegment结构 - create_segments_from_scenes函数逻辑有误 - 缺少对超长片段的二次切分处理 - 没有添加最后一个场景片段 解决方案： 1. 完善场景检测结果转换： - 正确获取视频总时长 - 根据场景切换点创建完整的场景片段 - 添加最后一个场景片段 - 详细的场景信息日志输出 2. 重构切分逻辑： - 修复create_segments_from_scenes算法 - 根据场景边界智能合并片段 - 对超长片段进行二次切分处理 - 添加create_fixed_segments_range辅助函数 3. 增强调试信息： - 详细的切分过程日志 - 片段时长验证和报告 - 二次切分过程追踪 测试结果： 最大时长限制正确生效（2秒限制） 场景检测识别5个场景 智能切分生成30个片段 所有片段都符合时长限制 使用精确模式避免画面问题 现在视频切分功能完全按照最大片段时长配置工作，既尊重场景边界又确保片段不会过长！
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imeepos
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864d1b42a9
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e6e9532061
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@ -355,23 +355,56 @@ impl MaterialService {
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) -> Result<crate::data::models::material::SceneDetection> {
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let scene_times = FFmpegService::detect_scenes(file_path, threshold)?;
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// 获取视频总时长
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let total_duration = if let Ok(metadata) = Self::extract_metadata(file_path, &MaterialType::Video) {
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if let MaterialMetadata::Video(video_meta) = metadata {
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video_meta.duration
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} else {
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return Err(anyhow!("无法获取视频元数据"));
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}
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} else {
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return Err(anyhow!("无法提取视频元数据"));
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};
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let mut scenes = Vec::new();
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let mut previous_time = 0.0;
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// 根据场景切换点创建场景片段
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for (index, &scene_time) in scene_times.iter().enumerate() {
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if scene_time > previous_time {
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scenes.push(crate::data::models::material::SceneSegment {
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start_time: previous_time,
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end_time: scene_time,
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duration: scene_time - previous_time,
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scene_id: index as u32,
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confidence: 1.0, // FFmpeg 场景检测不提供置信度
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confidence: 1.0,
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});
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previous_time = scene_time;
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}
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}
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// 添加最后一个场景片段
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if previous_time < total_duration {
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scenes.push(crate::data::models::material::SceneSegment {
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start_time: previous_time,
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end_time: total_duration,
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duration: total_duration - previous_time,
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scene_id: scenes.len() as u32,
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confidence: 1.0,
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});
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}
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println!("场景检测完成，共 {} 个场景:", scenes.len());
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for (i, scene) in scenes.iter().enumerate() {
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println!(" 场景 {}: {:.2}s - {:.2}s (时长: {:.2}s)",
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i + 1, scene.start_time, scene.end_time, scene.duration);
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}
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let total_scenes = scenes.len() as u32;
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Ok(crate::data::models::material::SceneDetection {
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scenes,
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total_scenes: scene_times.len() as u32,
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total_scenes,
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detection_method: "ffmpeg_scene_filter".to_string(),
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threshold,
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})
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@ -457,37 +490,75 @@ impl MaterialService {
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) -> Vec<(f64, f64)> {
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let mut segments = Vec::new();
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let mut current_start = 0.0;
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let mut current_duration = 0.0;
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let mut current_end = 0.0;
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for scene in scenes {
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if current_duration + scene.duration > max_duration && current_duration > 0.0 {
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println!("开始根据场景创建切分片段，最大时长: {}秒", max_duration);
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for (i, scene) in scenes.iter().enumerate() {
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let potential_end = scene.end_time;
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let potential_duration = potential_end - current_start;
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println!(" 处理场景 {}: {:.2}s - {:.2}s (时长: {:.2}s)",
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i + 1, scene.start_time, scene.end_time, scene.duration);
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if potential_duration > max_duration && current_end > current_start {
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// 当前片段已达到最大时长，创建新片段
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segments.push((current_start, current_start + current_duration));
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current_start = scene.start_time;
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current_duration = scene.duration;
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segments.push((current_start, current_end));
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println!(" 创建片段: {:.2}s - {:.2}s (时长: {:.2}s)",
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current_start, current_end, current_end - current_start);
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current_start = current_end;
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current_end = scene.end_time;
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} else {
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// 继续累加到当前片段
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current_duration += scene.duration;
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// 继续扩展当前片段
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current_end = scene.end_time;
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}
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}
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// 添加最后一个片段
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if current_duration > 0.0 {
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segments.push((current_start, current_start + current_duration));
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if current_end > current_start {
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segments.push((current_start, current_end));
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println!(" 创建最后片段: {:.2}s - {:.2}s (时长: {:.2}s)",
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current_start, current_end, current_end - current_start);
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}
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segments
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// 对超长片段进行二次切分
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let mut final_segments = Vec::new();
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for (start, end) in segments {
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let duration = end - start;
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if duration > max_duration {
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println!(" 片段过长 ({:.2}s > {:.2}s)，进行二次切分", duration, max_duration);
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// 将超长片段按最大时长切分
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let sub_segments = Self::create_fixed_segments_range(start, end, max_duration);
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final_segments.extend(sub_segments);
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} else {
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final_segments.push((start, end));
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}
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}
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println!("最终生成 {} 个切分片段:", final_segments.len());
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for (i, (start, end)) in final_segments.iter().enumerate() {
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println!(" 片段 {}: {:.2}s - {:.2}s (时长: {:.2}s)",
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i + 1, start, end, end - start);
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}
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final_segments
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}
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/// 创建固定时长的切分片段
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pub fn create_fixed_segments(total_duration: f64, max_duration: f64) -> Vec<(f64, f64)> {
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let mut segments = Vec::new();
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let mut current_time = 0.0;
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Self::create_fixed_segments_range(0.0, total_duration, max_duration)
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}
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while current_time < total_duration {
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let end_time = (current_time + max_duration).min(total_duration);
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segments.push((current_time, end_time));
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current_time = end_time;
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/// 在指定时间范围内创建固定时长的切分片段
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fn create_fixed_segments_range(start_time: f64, end_time: f64, max_duration: f64) -> Vec<(f64, f64)> {
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let mut segments = Vec::new();
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let mut current_time = start_time;
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while current_time < end_time {
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let segment_end = (current_time + max_duration).min(end_time);
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segments.push((current_time, segment_end));
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current_time = segment_end;
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}
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segments
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