Image processing 00:00:01-f image2\”,destFile\”; fullCommand=string.Concat(ffPath,strCommand); pth=新工艺(); pth.StartInfo.FileName=ffPath; pth.Star
00:00:01-f image2\”,destFile\”; fullCommand=string.Concat(ffPath,strCommand); pth=新工艺(); pth.StartInfo.FileName=ffPath; pth.StartInfo.Arguments=strCommand; pth.StartInfo.UseShellExecute=false; pth.StartInfo.CreateNoWindow=true; pth.Start(); pth.WaitForExit(); this.Cursor=Cursors.Default; } 私有int GetVideoLength(字符串ffmpeg,字符串源文件) { //exec('start C:\Inetpub\ffmpeg\ffmpeg-i“D:/Jaime flex.wmv“2>&1|grep”Duration“| cut-D”“-f4-| sed s/,/”,$output); 字符串结果=”; string strCommand=string.Concat( “-i\”,源文件“\”2>”; 流程pth=新流程(); pth.StartInfo.FileName=ffmpeg; pth.StartInfo.Arguments=strCommand; pth.StartInfo.UseShellExecute=false; pth.StartInfo.CreateNoWindow=true; pth.StartInfo.RedirectStandardOutput=true; pth.StartInfo.RedirectStandardError=true; pth.Start(); pth.WaitForExit(); //结果=pth.StandardOutput.ReadToEnd(); //结果=pth.StandardError.ReadToEnd(); 字符串str=“”; 字符串[]ssplit; char[]splitChars=new char[]{'.',''}; 整数秒=0; 而(!pth.StandardError.EndOfStream) { str=pth.StandardError.ReadLine(); 如果(str.Contains(“持续时间”)) { ssplit=str.Split(splitChars); seconds=GetSeconds(ssplit[3]); } } 返回秒数; } private int GetSeconds(字符串p) { 字符串[]ssplit=p.Split(“:”); int ho=转换为32(ssplit[0])*120; int mi=转换为32(ssplit[1])*60; int se=转换为32(ssplit[2]); 返回ho+mi+se; } } 公共类MediaItem { 公共字符串短名称{get;set;} 公共字符串全名{get;set;} 公共字符串iconName{get;set;} 公共媒体mainType mainType{get;set;} 公共媒体子类型子类型{get;set;} 公共长长度{get;set;} } 公共枚举MediaMainType { MMT\u视频=0,MMT\u图像,MMT\u图标,MMT\u NOTMEDIA } 公共枚举媒体子类型 { MST_JPG=0,MST_GIF,MST_BMP,MST_PNG,MST_MP4,MST_WMV,MST_FLV,MST_NOTMEDIA 3.Image processing 00:00:01-f image2\”,destFile\”; fullCommand=string.Concat(ffPath,strCommand); pth=新工艺(); pth.StartInfo.FileName=ffPath; pth.Star,image-processing,ffmpeg,video-capture,Image Processing,Ffmpeg,Video Capture,00:00:01-f image2\”,destFile\”; fullCommand=string.Concat(ffPath,strCommand); pth=新工艺(); pth.StartInfo.FileName=ffPath; pth.StartInfo.Arguments=strCommand; pth.StartInfo.UseShellExecute=false; pth.StartInfo.CreateNoWindow=true; pth.Start(); pth.WaitF
您将如何选择特定的视频帧作为缩略图?选择一个随机帧是否足够好,或者您是否希望选择一个最能代表特定视频的帧?您能否确切地说明问题所在?ffmpeg似乎对您有所帮助,但太费时间了。如果问题是文件的数量,那么ffmpeg生成,您可能可以限制它。
public partial class ThumbSelector : Form
{
public List<MediaItem> videoList = new List<MediaItem>();
private Random ra = new Random();
int iCount = 1;
public ThumbSelector()
{
InitializeComponent();
}
public void FillList()
{
if(videoList.Count() < 1)
return;
//only get mp4 files
var videosOnly = from n in videoList
where n.mainType == MediaMainType.MMT_VIDEO
select n;
lbVideoList.Items.Clear();
foreach (MediaItem mi in videosOnly)
{
lbVideoList.Items.Add(mi.shortName);
}
}
private void lbVideoList_SelectedIndexChanged(object sender, EventArgs e)
{
if(lbVideoList.SelectedItems.Count < 1)
return;
CreateThumbs(lbVideoList.SelectedItems[0].ToString());
}
private void CreateThumbs(string fShortName)
{
string sourceVideoName;
int sourceLength = 0;
int quarter = 0;
int half = 0;
int threequarter = 0;
string destDir = @"C:\Users\robert\dwhelper\VideoIcons";
string ffPath = System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\ffmpeg.exe";
var sname = (from n in videoList
where n.shortName == fShortName
select n).First();
sourceVideoName = sname.fullName;
sourceLength = GetVideoLength(ffPath, sourceVideoName);
quarter = sourceLength / 4;
half = sourceLength / 2;
threequarter = quarter * 3;
Image im1;
Image im2;
Image im3;
string n1;
string n2;
string n3;
while (File.Exists(string.Concat(destDir, @"\", "x1_", iCount.ToString(), ".jpg")))
{
++iCount;
}
n1 = string.Concat("x1_", iCount.ToString(), ".jpg");
++iCount;
while (File.Exists(string.Concat(destDir, @"\", "x2_", iCount.ToString(), ".jpg")))
{
++iCount;
}
n2 = string.Concat("x2_", iCount.ToString(), ".jpg");
++iCount;
while (File.Exists(string.Concat(destDir, @"\", "x3_", iCount.ToString(), ".jpg")))
{
++iCount;
}
n3 = string.Concat("x3_", iCount.ToString(), ".jpg");
pic1.Image = null;
pic2.Image = null;
pic3.Image = null;
CreateThumbs(sname, quarter, n1);
im1 = Image.FromFile(string.Concat(destDir, @"\", n1));
pic1.Image = im1;
CreateThumbs(sname, half, n2);
im2 = Image.FromFile(string.Concat(destDir, @"\", n2));
pic2.Image = im2;
CreateThumbs(sname, threequarter, n3);
im3 = Image.FromFile(string.Concat(destDir, @"\", n3));
pic3.Image = im3;
}
private void CreateThumbs(MediaItem mi, int timeIn, string outName)
{
this.Cursor = Cursors.WaitCursor;
Process pth;
string destDir = @"C:\Users\robert\dwhelper\VideoIcons";
string sourceFile;
string destFile;
string ffPath = System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\ffmpeg.exe";
string strCommand;
string fullCommand;
string[] ssplit;
sourceFile = mi.fullName;
ssplit = mi.shortName.Split('.');
destFile = string.Concat(destDir, "\\", outName);
strCommand = string.Concat(
" -i \"", sourceFile, "\" -r 1 -ss ", timeIn.ToString(), " -t 00:00:01 -f image2 \"", destFile, "\"");
fullCommand = string.Concat(ffPath, strCommand);
pth = new Process();
pth.StartInfo.FileName = ffPath;
pth.StartInfo.Arguments = strCommand;
pth.StartInfo.UseShellExecute = false;
pth.StartInfo.CreateNoWindow = true;
pth.Start();
pth.WaitForExit();
this.Cursor = Cursors.Default;
}
private int GetVideoLength(string ffmpeg, string sourceFile)
{
//exec('start C:\Inetpub\ffmpeg\ffmpeg -i "D:/Jaime-flex.wmv" 2>&1 | grep "Duration" | cut -d " " -f 4 - | sed s/,//', $output);
string result = "";
string strCommand = string.Concat(
" -i \"", sourceFile, "\" 2>");
Process pth = new Process();
pth.StartInfo.FileName = ffmpeg;
pth.StartInfo.Arguments = strCommand;
pth.StartInfo.UseShellExecute = false;
pth.StartInfo.CreateNoWindow = true;
pth.StartInfo.RedirectStandardOutput = true;
pth.StartInfo.RedirectStandardError = true;
pth.Start();
pth.WaitForExit();
//result = pth.StandardOutput.ReadToEnd();
//result = pth.StandardError.ReadToEnd();
string str = "";
string[] ssplit;
char[] splitChars = new char[] { '.', ' ' };
int seconds = 0;
while (!pth.StandardError.EndOfStream)
{
str = pth.StandardError.ReadLine();
if (str.Contains("Duration"))
{
ssplit = str.Split(splitChars);
seconds = GetSeconds(ssplit[3]);
}
}
return seconds;
}
private int GetSeconds(string p)
{
string[] ssplit = p.Split(':');
int ho = Convert.ToInt32(ssplit[0]) * 120;
int mi = Convert.ToInt32(ssplit[1]) * 60;
int se = Convert.ToInt32(ssplit[2]);
return ho + mi + se;
}
}
public class MediaItem
{
public string shortName { get; set; }
public string fullName { get; set; }
public string iconName { get; set; }
public MediaMainType mainType { get; set; }
public MediaSubType subType { get; set; }
public long length { get; set; }
}
public enum MediaMainType
{
MMT_VIDEO = 0, MMT_IMAGE, MMT_ICON, MMT_NOTMEDIA
}
public enum MediaSubType
{
MST_JPG = 0, MST_GIF, MST_BMP, MST_PNG, MST_MP4, MST_WMV, MST_FLV, MST_NOTMEDIA
3