467 lines
21 KiB
C#
467 lines
21 KiB
C#
using FFMpegCore;
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using FFMpegCore.Enums;
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using Standard;
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using System;
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using System.IO;
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using System.Threading.Tasks;
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using VideoConcat.Common.Tools;
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using static System.Windows.Forms.DataFormats;
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namespace VideoConcat.Services.Video
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{
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public class VideoProcess
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{
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/// <summary>
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/// 在前30%、中间30%、后30%三个位置各随机删除一帧，确保通过广告平台相似度检查
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/// </summary>
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/// <param name="inputPath">输入文件路径</param>
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/// <param name="outputPath">输出文件路径</param>
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/// <returns>操作是否成功</returns>
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public static async Task<bool> RemoveFrameRandomeAsync(string inputPath, string outputPath)
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{
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if (!File.Exists(inputPath))
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{
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LogUtils.Error($"输入文件不存在：{inputPath}");
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return false;
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}
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// 创建临时目录
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string tempDir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
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try
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{
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Directory.CreateDirectory(tempDir);
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// 1. 获取视频信息
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IMediaAnalysis mediaInfo = await FFProbe.AnalyseAsync(inputPath);
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var videoStream = mediaInfo.PrimaryVideoStream;
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if (videoStream == null)
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{
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LogUtils.Error("没有找到视频流");
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return false;
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}
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// 视频总时长（秒）
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double totalDuration = mediaInfo.Duration.TotalSeconds;
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double frameRate = videoStream.FrameRate;
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// 确保视频时长足够（至少20秒）
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if (totalDuration < 20)
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{
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LogUtils.Error($"视频时长太短（{totalDuration:F2}秒），无法抽帧（需要至少20秒）");
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return false;
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}
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// 计算总帧数
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int totalFrames = (int)(totalDuration * frameRate);
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if (totalFrames <= 0)
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{
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LogUtils.Error($"无法计算视频总帧数，帧率={frameRate}");
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return false;
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}
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// 如果是 HEVC 编码，先转换为 H.264（select 过滤器在某些编码格式下可能不稳定）
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bool isHevc = videoStream.CodecName == "hevc";
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string workingInputPath = inputPath;
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if (isHevc)
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{
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try
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{
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string videoConvert = Path.Combine(tempDir, $"{Guid.NewGuid()}.mp4");
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LogUtils.Info($"检测到 HEVC 编码，先转换为 H.264：{inputPath} -> {videoConvert}");
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await FFMpegArguments.FromFileInput(inputPath)
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.OutputToFile(videoConvert, true, opt =>
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opt.WithVideoCodec("libx264")
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.WithAudioCodec("copy") // 复制音频流，不重新编码
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).ProcessAsynchronously();
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// 重新分析转换后的视频
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mediaInfo = await FFProbe.AnalyseAsync(videoConvert);
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videoStream = mediaInfo.PrimaryVideoStream;
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if (videoStream == null)
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{
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LogUtils.Error("转换后没有找到视频流");
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return false;
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}
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totalDuration = mediaInfo.Duration.TotalSeconds;
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frameRate = videoStream.FrameRate;
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totalFrames = (int)(totalDuration * frameRate);
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workingInputPath = videoConvert;
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LogUtils.Info($"HEVC 转换完成，新帧率={frameRate}, 总帧数={totalFrames}");
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}
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catch (Exception ex)
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{
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LogUtils.Error("HEVC 转换失败", ex);
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return false;
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}
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}
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// 2. 计算三个区域的范围（前30%、中间30%、后30%）
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// 前30%：0% 到 30%
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int front30StartFrame = 0;
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int front30EndFrame = (int)(totalFrames * 0.30);
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// 中间30%：35% 到 65%（避开边界）
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int middle30StartFrame = (int)(totalFrames * 0.35);
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int middle30EndFrame = (int)(totalFrames * 0.65);
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// 后30%：70% 到 100%
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int back30StartFrame = (int)(totalFrames * 0.70);
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int back30EndFrame = totalFrames - 1; // 最后一帧
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// 确保范围有效
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if (front30EndFrame <= front30StartFrame) front30EndFrame = front30StartFrame + 1;
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if (middle30EndFrame <= middle30StartFrame) middle30EndFrame = middle30StartFrame + 1;
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if (back30EndFrame <= back30StartFrame) back30EndFrame = back30StartFrame + 1;
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// 使用时间戳和文件路径作为随机种子，确保每次处理都不同
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var random = new Random((int)(DateTime.Now.Ticks % int.MaxValue) + inputPath.GetHashCode());
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// 3. 在每个区域随机选择一帧删除
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int frame1 = random.Next(front30StartFrame, front30EndFrame + 1); // 前30%
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int frame2 = random.Next(middle30StartFrame, middle30EndFrame + 1); // 中间30%
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int frame3 = random.Next(back30StartFrame, back30EndFrame + 1); // 后30%
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// 确保三帧不重复（如果重复，调整其中一个）
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if (frame2 == frame1) frame2 = (frame2 + 1) % totalFrames;
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if (frame3 == frame1 || frame3 == frame2)
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{
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frame3 = (frame3 + 1) % totalFrames;
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if (frame3 == frame1 || frame3 == frame2) frame3 = (frame3 + 1) % totalFrames;
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}
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double time1 = frame1 / frameRate;
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double time2 = frame2 / frameRate;
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double time3 = frame3 / frameRate;
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LogUtils.Info($"开始精确抽帧：输入={inputPath}, 输出={outputPath}, 总帧数={totalFrames}");
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LogUtils.Info($"删除帧1（前30%）：帧编号={frame1}, 时间≈{time1:F2}秒");
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LogUtils.Info($"删除帧2（中间30%）：帧编号={frame2}, 时间≈{time2:F2}秒");
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LogUtils.Info($"删除帧3（后30%）：帧编号={frame3}, 时间≈{time3:F2}秒");
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// 4. 只删除视频帧，音频直接复制，使用最快编码设置以达到1秒内完成
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// 注意：使用 select 过滤器删除帧时，视频需要重新编码，但使用最快设置
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LogUtils.Info("使用最快模式删除帧（仅处理视频，音频直接复制）...");
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var ffmpegArgs = FFMpegArguments
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.FromFileInput(workingInputPath)
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.OutputToFile(outputPath, true, options =>
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{
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// 使用 select 过滤器删除三帧（只删除视频帧）
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options.WithCustomArgument($"-vf select='not(eq(n\\,{frame1})+eq(n\\,{frame2})+eq(n\\,{frame3}))'");
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// 视频编码：使用最快设置
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options.WithVideoCodec("libx264");
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options.WithCustomArgument("-preset ultrafast"); // 最快编码预设
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options.WithCustomArgument("-tune zerolatency"); // 零延迟调优
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options.WithConstantRateFactor(28); // 质量设置（28比23快）
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options.WithCustomArgument("-g 30"); // 减少关键帧间隔
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options.WithCustomArgument("-threads 0"); // 使用所有CPU核心
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options.WithCustomArgument("-vsync cfr"); // 恒定帧率
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// 音频：直接复制，不重新编码（最快，不处理）
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options.WithAudioCodec("copy"); // 直接复制音频流，零处理时间
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});
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bool success = ffmpegArgs.ProcessSynchronously();
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// 验证输出文件是否存在且有效
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if (success && File.Exists(outputPath))
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{
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FileInfo fileInfo = new FileInfo(outputPath);
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if (fileInfo.Length > 0)
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{
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// 验证输出视频的帧数是否正确（应该比原视频少3帧）
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try
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{
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var outputMediaInfo = await FFProbe.AnalyseAsync(outputPath);
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var outputVideoStream = outputMediaInfo.PrimaryVideoStream;
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if (outputVideoStream != null)
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{
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int expectedFrames = totalFrames - 3;
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double outputDuration = outputMediaInfo.Duration.TotalSeconds;
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int actualFrames = (int)(outputDuration * outputVideoStream.FrameRate);
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LogUtils.Info($"抽帧完成：输出文件={outputPath}, 大小={fileInfo.Length / 1024 / 1024:F2}MB, 时长={outputDuration:F2}秒, 帧数≈{actualFrames} (预期少3帧)");
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// 验证时长是否合理（应该略小于原视频）
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if (outputDuration >= totalDuration)
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{
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LogUtils.Warn($"警告：输出视频时长({outputDuration:F2}秒) >= 原视频时长({totalDuration:F2}秒)，可能未成功删除帧");
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}
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}
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}
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catch (Exception ex)
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{
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LogUtils.Warn($"验证输出视频信息时出错（不影响结果）：{ex.Message}");
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}
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return true;
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}
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else
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{
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LogUtils.Error($"输出文件存在但大小为0：{outputPath}");
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return false;
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}
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}
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else
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{
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LogUtils.Error($"抽帧失败：success={success}, 文件存在={File.Exists(outputPath)}, 输出路径={outputPath}");
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return false;
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}
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}
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catch (Exception ex)
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{
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LogUtils.Error("抽帧过程发生异常", ex);
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return false;
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}
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finally
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{
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// 清理临时目录
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try
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{
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if (Directory.Exists(tempDir))
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{
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string[] files = Directory.GetFiles(tempDir);
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foreach (string file in files)
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{
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try
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{
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File.Delete(file);
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}
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catch
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{
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// 忽略删除失败
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}
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}
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try
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{
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Directory.Delete(tempDir);
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}
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catch
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{
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// 忽略删除失败
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}
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}
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}
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catch
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{
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// 忽略清理错误
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}
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}
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}
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/// <summary>
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/// 通过修改视频元数据（添加注释）改变MD5
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/// </summary>
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public static bool ModifyByMetadata(string inputPath, string outputPath, string comment = "JSY")
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{
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// 添加或修改视频元数据中的注释信息
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return FFMpegArguments
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.FromFileInput(inputPath)
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.OutputToFile(outputPath, true, options => options
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//.WithVideoCodec("copy") // 直接复制视频流，不重新编码
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//.WithAudioCodec("copy") // 直接复制音频流
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.CopyChannel()
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.WithCustomArgument($"-metadata comment=\"{comment}_{Guid.NewGuid()}\"") // 添加唯一注释
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)
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.ProcessSynchronously();
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}
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public static bool SubVideo(string inputPath, string outputPath, Double startSec, Double endSec)
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{
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try
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{
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// 计算时长
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double duration = endSec - startSec;
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if (duration <= 0)
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{
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LogUtils.Error($"SubVideo失败：时长无效，开始={startSec}秒, 结束={endSec}秒");
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return false;
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}
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LogUtils.Info($"SubVideo：输入={inputPath}, 输出={outputPath}, 开始={startSec}秒, 结束={endSec}秒, 时长={duration}秒");
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// 使用 -ss 和 -t 参数进行裁剪
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bool result = FFMpegArguments
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.FromFileInput(inputPath, true, options => options
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.Seek(TimeSpan.FromSeconds(startSec))
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.WithCustomArgument($"-t {duration}")) // 指定时长而不是结束时间
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.OutputToFile(outputPath, true, options => options
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.CopyChannel()) // 复制流，不重新编码
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.ProcessSynchronously();
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// 验证输出文件是否存在
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if (result && File.Exists(outputPath))
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{
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FileInfo fileInfo = new FileInfo(outputPath);
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LogUtils.Info($"SubVideo成功：{outputPath}, 文件大小={fileInfo.Length / 1024 / 1024}MB");
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return true;
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}
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else
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{
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LogUtils.Error($"SubVideo失败：输入={inputPath}, 输出={outputPath}, 开始={startSec}秒, 结束={endSec}秒, 结果={result}, 文件存在={File.Exists(outputPath)}");
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return false;
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}
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}
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catch (Exception ex)
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{
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LogUtils.Error($"SubVideo异常：输入={inputPath}, 输出={outputPath}", ex);
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return false;
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}
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}
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public static bool SubAudio(string inputPath, string outputPath, Double startSec, Double endSec)
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{
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return FFMpegArguments
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.FromFileInput(inputPath, true, options => options.Seek(TimeSpan.FromSeconds(startSec)).EndSeek(TimeSpan.FromSeconds(endSec)))
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.OutputToFile(outputPath, true, options => options.CopyChannel())
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.ProcessSynchronously();
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}
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public static bool JoinVideo(string outPutPath, string[] videoParts)
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{
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try
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{
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// 验证所有输入文件是否存在
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foreach (var part in videoParts)
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{
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if (!File.Exists(part))
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{
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LogUtils.Error($"JoinVideo失败：输入文件不存在 - {part}");
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return false;
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}
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}
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bool result = FFMpeg.Join(outPutPath, videoParts);
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// 验证输出文件是否存在
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if (result && File.Exists(outPutPath))
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{
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LogUtils.Info($"JoinVideo成功：{outPutPath}");
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return true;
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}
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else
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{
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LogUtils.Error($"JoinVideo失败：输出文件不存在 - {outPutPath}");
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return false;
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}
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}
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catch (Exception ex)
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{
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LogUtils.Error($"JoinVideo异常：输出={outPutPath}", ex);
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return false;
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}
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}
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public async Task<bool> ProcessVideo(string inputPath, string outputPath, string tempDir)
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{
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// 1. 获取视频信息
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IMediaAnalysis mediaInfo = await FFProbe.AnalyseAsync(inputPath);
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var videoStream = mediaInfo.PrimaryVideoStream;
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if (videoStream == null)
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{
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Console.WriteLine("没有找到视频流");
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return false;
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}
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// 视频总时长（秒）
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var totalDuration = mediaInfo.Duration.TotalSeconds;
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// 计算帧时间参数
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double frameRate = videoStream.FrameRate;
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double frameDuration = Math.Round(1.0 / frameRate, 6); // 一帧时长（秒）
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int totalFram = (int)(totalDuration * frameRate);
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// 2. 随机生成要删除的帧的时间点（避开最后一帧，防止越界）
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var random = new Random();
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var randomFrame = random.Next(20, totalFram - 10);
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double frameTime = Math.Round((randomFrame - 1) * frameDuration, 6); // 目标帧开始时间
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double nextFrameTime = Math.Round((randomFrame + 1) * frameDuration, 6); // 下一帧开始时间
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// 临时文件路径
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string videoPart1 = Path.Combine(tempDir, $"{Guid.NewGuid()}.mp4");
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string videoPart2 = Path.Combine(tempDir, $"{Guid.NewGuid()}.mp4");
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string audioPath = Path.Combine(tempDir, $"{Guid.NewGuid()}.aac");
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string videoNoaudioPath = Path.Combine(tempDir, $"{Guid.NewGuid()}.mp4");
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string finalyPath = Path.Combine(tempDir, $"{Guid.NewGuid()}.mp4");
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string audioPart1 = Path.Combine(tempDir, $"{Guid.NewGuid()}.aac");
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string audioPart2 = Path.Combine(tempDir, $"{Guid.NewGuid()}.aac");
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// 分离视频流（不含音频）
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await FFMpegArguments
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.FromFileInput(inputPath)
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.OutputToFile(videoNoaudioPath, true, opt => opt.WithCustomArgument("-an -c:v copy"))
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.ProcessAsynchronously();
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if (!File.Exists(videoNoaudioPath))
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return false;
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// 分离音频流（不含视频）（如有音频）
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if (mediaInfo.PrimaryAudioStream != null)
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{
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await FFMpegArguments
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.FromFileInput(inputPath)
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.OutputToFile(audioPath, true, opt => opt.WithCustomArgument("-vn -c:a copy"))
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.ProcessAsynchronously();
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if (!File.Exists(audioPath))
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return false;
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}
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inputPath = videoNoaudioPath;
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bool hasSubVideo1 = SubVideo(inputPath, videoPart1, 0, frameTime);
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bool hasSubVideo2 = SubVideo(inputPath, videoPart2, nextFrameTime, totalDuration);
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if (!hasSubVideo1 || !hasSubVideo2)
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{
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return false;
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}
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bool isJoinSuccess = JoinVideo(finalyPath, [videoPart1, videoPart2]);
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if (!isJoinSuccess)
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{
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return false;
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}
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return await FFMpegArguments.FromFileInput(finalyPath)
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.AddFileInput(audioPath)
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.OutputToFile(outputPath, true, opt =>
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opt.WithCustomArgument("-c copy -shortest -y"))
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.ProcessAsynchronously();
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}
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public static bool RemoveVideoFrame(string inputPath, string outputPath, int frameToRemove)
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{
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// 使用FFMpegArguments构建转换流程
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return FFMpegArguments
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.FromFileInput(inputPath)
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.OutputToFile(outputPath, true, options => options
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// 使用select过滤器排除指定帧（帧序号从0开始）
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.WithCustomArgument($"select=not(eq(n\\,{frameToRemove}))")
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// $"not(eq(n\\,{frameToRemove}))"); // 注意：在C#中需要转义反斜杠
|
||
//// 保持其他编码参数
|
||
.WithVideoCodec("libx264")
|
||
.WithAudioCodec("copy") // 如果不需要处理音频，直接复制
|
||
)
|
||
.ProcessSynchronously();
|
||
}
|
||
}
|
||
}
|