从ffmpeg保存后无法打开jpg图像 [英] opening jpg image after saving from ffmpeg not working
问题描述
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，但我在创建缩略图时遇到问题。它保存了picture.jpg，但没有图像。看着缩略图它只有正常的photoviewer标志，这很好，但当我尝试打开图像时，它会给出一条消息
Windows照片查看器：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。 （这个图像是2.7MB） - 从我的相机拍摄的照片大约是5MB并打开。
PictureViewer：无法显示image.jpg因为a找不到合适的图形导入器。
画图：画图无法读取此文件。这不是一个有效的位图文件，或者目前不支持它的格式。
图像不会在我保存图像时打开：
In my project I am saving videos, converting formats to .swf using ffmpeg. Converting and saving the videos is working fine, but I have a problem with creating the thumbnails. It saves a "picture.jpg" but there is no image. looking at the thumbnail its only got the normal photoviewer sign which is fine, but when I try to open the image it gives a message of
Windows photo viewer: Windows photo viewer cant open this picture because the file appears to be damaged, corrupted, or is too large. (this image is 2.7MB) - Photos taken from my camera is about 5MB and that opens.
PictureViewer: couldn''t display "image.jpg" because a suitable graphics importer could not be found.
Paint: Paint cannot read this file. This is not a valid bitmap file or its format is currently not supported.
The images won''t open in any I done to save the image:
tring thumbpath, thumbname;
string thumbargs;
string thumbre;
thumbpath = Server.MapPath("~\\uploads\\" + dtYear + "\\" + dtMonth + "\\Thumb\\");
CreateDirectoryIfNotExists(thumbpath);
// Create the path and file name to check for duplicates.
pathToCheck = thumbpath;
// Create a temporary file name to use for checking duplicates.
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 = thumbpath + counter.ToString() + withoutext + ".jpg";
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 + ".jpg";
}
thumbname = thumbpath + withoutext + "%d" + ".jpg";
Session["thumbname"] = withoutext + "1" + ".jpg";
// thumbargs = "-i {0} -f image2 frame-%1d.png -y {1};
thumbargs = "-i " + inputfile + "-f image2 -ss 1.000 -vframes 1 " + thumbName;
Process thumbproc = new Process();
thumbproc = new Process();
thumbproc.StartInfo.FileName = spath + "\\ffmpeg\\ffmpeg.exe";
thumbproc.StartInfo.Arguments = thumbargs;
thumbproc.StartInfo.UseShellExecute = false;
thumbproc.StartInfo.CreateNoWindow = false;
thumbproc.StartInfo.RedirectStandardOutput = false;
try
{
thumbproc.Start();
fuPath.PostedFile.SaveAs(thumbname);
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
thumbproc.WaitForExit();
thumbproc.Close();
编辑：
我试过这些论点同样，仍然无法使图像工作......
它保存，无法打开它...
I''ve tried these arguments as well, still can''t get the image to work...
It saves, just can''t open it...
//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;
EDIT:
I tried adding the argument to the command prompt to see if it works there but it gave me a message of : [NULL @ 000000000025f7a0] Unable to find a suitable output format for 'vframes' vframes: invalid argument The line I used:
<pre lang="c#">>
ffmpeg -i VID2012.3GP vframes 1 VID2012.jpg
编辑：
我改变了一些代码。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）它显示类型System.InvalidOperationException的异常
I changed a bit of my code. Debugging through my code there is no exception that is thrown, but if I point the mouse over the process (after it started) it "shows an exception of type System.InvalidOperationException"
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();
}
推荐答案
这很简单，但你真正需要的是阅读FFmpeg命令行帮助更多关注。它并不像第一眼看到的那么简单：
http://www.ffmpeg.org /ffmpeg.html [ ^ ]。
-SA
This is simple, but what you really need to is read FFmpeg command-line help paying more attention. It is not as simple as it may look at first glance:
http://www.ffmpeg.org/ffmpeg.html[^].
—SA
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