为什么在从我的网络应用程序转换视频时ffmpeg从未完成? [英] Why does ffmpeg never finish when converting a video from my web app?
问题描述
当用户提交表单时,我正在尝试转换视频。似乎转换好的,但是当我尝试做任何事情时,文件被另一个进程使用。看起来ffmpeg.exe不会退出。我的代码在下面有什么我应该做的不同,以允许进程释放文件?如果我手动运行,它会正常运行。
I am trying to convert a video when the user submits a form. It seems to convert ok but the file "is being used by another proccess" when I try to do anything with it. It looks like ffmpeg.exe never exits. My code is below is there anything I should be doing different to allow the process to release the file? If I run this manually it exits fine.
internal class ConversionUtility : Utility
{
public void Convert(string videoFileName)
{
var video = new VideoFile(videoFileName);
if (!video.infoGathered)
GetVideoInfo(video);
var Params = string.Format("-y -i \"{0}\" -coder ac -me_method full -me_range 16 -subq 5 -sc_threshold 40 -vcodec libx264 -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -i_qfactor 0.71 -keyint_min 25 -b_strategy 1 -g 250 -r 20 \"{1}\"", video.Path, Path.ChangeExtension(videoFileName,".mp4"));
//var Params = string.Format("-y -i \"{0}\" -acodec libfaac -ar 44100 -ab 96k -coder ac -me_method full -me_range 16 -subq 5 -sc_threshold 40 -vcodec libx264 -s 1280x544 -b 1600k -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -i_qfactor 0.71 -keyint_min 25 -b_strategy 1 -g 250 -r 20 c:\\output3.mp4", video.Path, videoFileName);
//var Params = String.Format(" {0} \"{1}\"",this.FFmpegLocation, video.Path);
var threadStart = new ParameterizedThreadStart(del => RunProcess(Params));
var thread = new Thread(threadStart);
thread.Start();
//RunProcess(Params);
}
}
internal class Utility
{
public string FFmpegLocation { get; set; }
private string WorkingPath { get { return Path.GetDirectoryName(FFmpegLocation); } }
protected string RunProcess(string Parameters)
{
//create a process info
var oInfo = new ProcessStartInfo(this.FFmpegLocation, Parameters)
{
UseShellExecute = false,
CreateNoWindow = true,
RedirectStandardOutput = true,
RedirectStandardError = true
};
//Create the output and streamreader to get the output
string output = null; StreamReader srOutput = null;
//try the process
try
{
//run the process
Process proc = System.Diagnostics.Process.Start(oInfo);
proc.WaitForExit();
//if (!proc.WaitForExit(10000))
// proc.Kill();
//get the output
srOutput = proc.StandardError;
//now put it in a string
output = srOutput.ReadToEnd();
proc.Close();
}
catch (Exception)
{
output = string.Empty;
}
finally
{
//now, if we succeded, close out the streamreader
if (srOutput != null)
{
srOutput.Close();
srOutput.Dispose();
}
}
return output;
}
推荐答案
经过很多研究我发现这个帖子。这使我在正确的轨道上。我阅读了关于 RedirectStandardError 的更多信息,并发现我需要改变我所说的事情的顺序。在调用 WaitForExit
之后,一切正常工作。以下是更新的代码:
After a good bit of research I came across this post. Which set me on the right track. I read more about RedirectStandardError and found I needed to change the order I was calling things. After calling WaitForExit
at the end everything worked as expected. Here is the updated code:
protected string RunProcess(string Parameters)
{
//create a process info
var oInfo = new ProcessStartInfo(this.FFmpegLocation, Parameters)
{
UseShellExecute = false,
CreateNoWindow = true,
RedirectStandardOutput = true,
RedirectStandardError = true
};
var output = string.Empty;
try
{
Process process = System.Diagnostics.Process.Start(oInfo);
output = process.StandardError.ReadToEnd();
process.WaitForExit();
process.Close();
}
catch (Exception)
{
output = string.Empty;
}
return output;
}
这篇关于为什么在从我的网络应用程序转换视频时ffmpeg从未完成?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!