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POHow to extract stream of images from video file using ffmpeg
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  1. POHow to extract stream of images from video file using ffmpeg
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    copied!<p>I want to extract stream of images from a video file using ffmpeg.</p> <p>I know I can extract them straight to the hard drive using these arguments:</p> <p>-i - -qscale 1 h:\out\img-%05d.jpg</p> <p>But i would like to extract directly to a stream.</p> <p>This is my code so far:</p> <pre><code>private void ExtractImagesFromVideo(byte[] data,string _args) { try { serverBuild = new Process(); serverBuild.StartInfo.WorkingDirectory = Environment.CurrentDirectory; serverBuild.StartInfo.Arguments = _args; serverBuild.StartInfo.FileName = Environment.CurrentDirectory + @"\ffmpeg.exe"; serverBuild.StartInfo.UseShellExecute = false; serverBuild.StartInfo.RedirectStandardOutput = true; serverBuild.StartInfo.RedirectStandardError = true; serverBuild.StartInfo.RedirectStandardInput = true; serverBuild.StartInfo.CreateNoWindow = true; serverBuild.StartInfo.LoadUserProfile = false; serverBuild.EnableRaisingEvents = true; serverBuild.Start(); using (BinaryWriter bw = new BinaryWriter(serverBuild.StandardInput.BaseStream)) { bw.Write(data); } mStandardOutput = serverBuild.StandardOutput.BaseStream; mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null); serverBuild.WaitForExit(); byte[] _data = mStandardOutputMs.ToArray(); mStandardOutput.Close(); } catch (Exception _ex) { } finally { serverBuild.Dispose(); } } </code></pre> <p>and I call like like this:</p> <pre><code> string _argsOut = @"-i pipe:0 -qscale 1 -f mjpeg pipe:1 "; ExtractImagesFromVideo(data, _argsOut); </code></pre> <p>and it hangs on this line:</p> <pre><code>bw.Write(data); </code></pre> <p>thanks</p>
 

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