ffmpeg 的一些使用提取帧, 图片合成视频等

1 提取视频帧

Process ffmpeg = new Process();
ffmpeg.StartInfo.Arguments = " -i " + videoFilePath + " -r 1 -q:v 2 -f image2 " +     @imagePath + "\\%6d.jpeg";
ffmpeg.StartInfo.FileName = Folder + "ffmpeg.exe";
ffmpeg.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
ffmpeg.Start();
ffmpeg.WaitForExit();
ffmpeg.Close();
ffmpeg.Dispose();

-videoFilePath : 视频文件路径

-imagePath : 存放图片路径

-r : 每s取一帧

-q:v:图片质量等

-%6d:图片名称000001.jpg......

 

 

2 多张图片合成视频

Process ffmpeg = new Process();
ffmpeg.StartInfo.Arguments = "-r 25 -i " + imagespath + "\\pic-%6d.jpeg " + VideoPath + "\\" + videoName +  ".mp4";
ffmpeg.StartInfo.FileName = Folder + "ffmpeg.exe";
ffmpeg.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
ffmpeg.Start();
ffmpeg.WaitForExit();
ffmpeg.Close();
ffmpeg.Dispose();

-r : 每秒多少帧

- imagespath : 存放图片的文件夹路径

-videopath : 存放视频的路径 

3 c#获取文件名的方式


string filename = System.IO.Path.GetFileName(fullPath);//文件名全称  image.jpg
string extension = System.IO.Path.GetExtension(fullPath);//文件名后缀  jpg
string fileNameWithoutExtension = System.IO.Path.GetFileNameWithoutExtension(fullPath); //文件名不带后缀 image

 4 其他ffmpeg相关功能应用

常用命令

应用

帧间隔、时间间隔取帧

#时间间隔
ffmpeg -i <input> -filter:v "select=(gte(t\,120))*(isnan(prev_selected_t)+gte(t-prev_selected_t\,120))" -frames:v 1 -y tile.png

 

 

 

 

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