在我的项目中，我正在保存视频，使用 ffmpeg 将格式转换为 .swf。转换和保存视频工作正常，但创建缩略图时遇到问题。它保存了“picture.jpg”，但没有图像。查看缩略图，它只有正常的 photoviewer 标志，这很好，但是当我尝试打开图像时，它会显示 Windows 照片查看器的消息：Windows 照片查看器无法打开此图片，因为文件似乎已损坏、损坏或太大。（这张图片是 2.7MB） - 从我的相机拍摄的照片大约是 5MB 并且可以打开。
PictureViewer：无法显示“image.jpg”，因为找不到合适的图形导入器。
油漆：油漆无法读取此文件。这不是一个有效的位图文件或其格式目前不受支持。我为保存图像所做的任何操作都不会打开图像：
protected void btnUploadVideo_Click(object sender, EventArgs e)
{
string dtMonth = DateTime.Now.ToString("MMM");
string dtYear = DateTime.Now.ToString("yyyy");
lblMsg.Visible = false;
lblMsg.Visible = true;
// Before attempting to save the file, verify
// that the FileUpload control contains a file.
if (fuPath.HasFile)
{
// Get the size in bytes of the file to upload.
int fileSize = fuPath.PostedFile.ContentLength;
// Allow only files less than 2,100,000 bytes (approximately 2 MB) to be uploaded.
if (fileSize < 10497717)
{
// Call a helper method routine to save the file.
SaveFile2();
}
}
else
// Notify the user that a file was not uploaded.
lblMsg.Text = "You did not specify a file to upload.";
}
private void SaveFile2()
{
string dtMonth = DateTime.Now.ToString("MMM");
string dtYear = DateTime.Now.ToString("yyyy");
if (fuPath != null || fuPath.PostedFile != null)
{
postedfilename = fuPath.PostedFile.FileName;
SavePath = Server.MapPath("~\\Video\\");
string NewFName = postedfilename;
NewFName = NewFName.Substring(NewFName.LastIndexOf("\\") + 1, NewFName.Length - NewFName.LastIndexOf(".")) + "." + NewFName.Substring(NewFName.LastIndexOf(".") + 1);
Filenamewithpath = SavePath + NewFName;
string outputPath = Server.MapPath("~\\uploads\\" + dtYear + "\\" + dtMonth + "\\SWF\\");
CreateDirectoryIfNotExists(SavePath);
CreateDirectoryIfNotExists(outputPath);
//Save The file
fuPath.PostedFile.SaveAs(Filenamewithpath);
//Start Converting
string inputfile, outputfile, filargs;
string withoutext;
//Get the file name without Extension
withoutext = Path.GetFileNameWithoutExtension(Filenamewithpath);
//Input file path of uploaded image
inputfile = SavePath + NewFName;
//output file format in swf
outputfile = outputPath + withoutext + ".swf";
Session["outputfile"] = withoutext + ".swf";
//file orguments for FFMEPG
// Create the path and file name to check for duplicates.
string pathToCheck = outputfile;
// Create a temporary file name to use for checking duplicates.
string tempfileName = "";
// Check to see if a file already exists with the
// same name as the file to upload.
if (System.IO.File.Exists(pathToCheck))
{
int counter = 2;
while (System.IO.File.Exists(pathToCheck))
{
// if a file with this name already exists,
// prefix the filename with a number.
tempfileName = outputPath + counter.ToString() + withoutext + ".swf";
pathToCheck = tempfileName;
counter++;
}
outputfile = tempfileName;
// Notify the user that the file name was changed.
lblMsg.Text = "A file with the same name already exists." +
"<br />Your file was saved as " + counter.ToString() + withoutext + ".swf";
}
filargs = "-i " + inputfile + " -ar 22050 " + outputfile;
string spath;
spath = Server.MapPath(".");
Process proc;
proc = new Process();
proc.StartInfo.FileName = spath + "\\ffmpeg\\ffmpeg.exe";
proc.StartInfo.Arguments = filargs;
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.CreateNoWindow = false;
proc.StartInfo.RedirectStandardOutput = false;
try
{
proc.Start();
fuPath.PostedFile.SaveAs(outputfile);
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
proc.WaitForExit();
proc.Close();
//Create Thumbs
string thumbPath, thumbName;
string thumbargs;
thumbPath = Server.MapPath("~\\uploads\\" + dtYear + "\\" + dtMonth + "\\Thumb\\");
CreateDirectoryIfNotExists(thumbPath);
thumbName = thumbPath + withoutext + ".jpg";
// Create the path and file name to check for duplicates.
string thumbPathToCheck = thumbName;
// Create a temporary file name to use for checking duplicates.
string thumbTempfileName = "";
// Check to see if a file already exists with the
// same name as the file to upload.
if (System.IO.File.Exists(thumbPathToCheck))
{
int counter = 2;
while (System.IO.File.Exists(thumbPathToCheck))
{
// if a file with this name already exists,
// prefix the filename with a number.
thumbTempfileName = thumbPath + counter.ToString() + withoutext + ".jpg";
thumbPathToCheck = thumbTempfileName;
counter++;
}
thumbName = thumbTempfileName;
// Notify the user that the file name was changed.
lblMsg.Text = "A file with the same name already exists." +
"<br />Your file was saved as " + counter.ToString() + withoutext + ".jpg";
}
//thumbargs = "-i " + inputfile + " -an -ss 00:00:03 -s 120×90 -vframes 1 -f mjpeg " + thumbName;
// thumbargs = "-i " + inputfile + "-f image2 -ss 1.000 -vframes 1 " + thumbName;
thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:10 -s 150x150 " + thumbName;
// thumbargs = "ffmpeg -i" + inputfile + " -ss 0:00:01.000 -sameq -vframes 1 " + withoutext + ".jpg";
// thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:07 -s 150x150 " + thumbName;
Process thumbproc = new Process();
thumbproc.StartInfo.FileName = spath + "\\ffmpeg\\ffmpeg.exe";
thumbproc.StartInfo.Arguments = thumbargs;
thumbproc.StartInfo.UseShellExecute = false;
thumbproc.StartInfo.CreateNoWindow = true;
thumbproc.StartInfo.RedirectStandardOutput = false;
string data = "";
try
{
fuPath.PostedFile.SaveAs(thumbName);
thumbproc.Start();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
thumbproc.WaitForExit();
thumbproc.Close();
File.Delete(inputfile);
lblMsg.Text = "Video Uploaded Successfully";
hyp.Visible = true;
hyp.NavigateUrl = "WatchVideo.aspx";
SaveToDB(outputfile, thumbName);
}
}
编辑：如果是拇指参数，我尝试了几种方法，但没有成功：
//thumbargs = "-i " + inputfile + " -an -ss 00:00:03 -s 120×90 -vframes 1 -f mjpeg " + thumbName;
// thumbargs = "-i " + inputfile + "-f image2 -ss 1.000 -vframes 1 " + thumbName;
thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:10 -s 150x150 " + thumbName;
// thumbargs = "ffmpeg -i" + inputfile + " -ss 0:00:01.000 -sameq -vframes 1 " + withoutext + ".jpg";
这是保存后的样子，但是打不开......
编辑：
我尝试将参数添加到命令提示符以查看它是否在那里工作，但它给了我一条消息：[NULL @ 000000000025f7a0] Unable to find a suitable output format for 'vframes' vframes: invalid argument 我使用的行：
ffmpeg -i VID2012.3GP vframes 1 VID2012.jpg
如果是在 IIS 中设置不正确，我该如何设置？
编辑：我更改了一些代码。通过我的代码进行调试没有抛出异常，但是如果我将鼠标指向进程（在它启动之后），它“显示 System.InvalidOperationException 类型的异常”
thumbargs = "-i " + postedfilename + " vframes 1" + thumbName;
ProcessStartInfo thumbProcstartIfo = new ProcessStartInfo();
thumbProcstartIfo.FileName = @"\ffmpeg\ffmpeg.exe";
thumbProcstartIfo.Arguments = thumbargs;
thumbProcstartIfo.UseShellExecute = false;
thumbProcstartIfo.CreateNoWindow = true;
thumbProcstartIfo.RedirectStandardOutput = false;
try
{
using (var process = new Process())
{
process.StartInfo = thumbProcstartIfo;
process.Start();
process.WaitForExit();
}
}
catch (InvalidOperationException ex)
{
lblMsg.Text = ex.ToString();
}