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    <p>The key to speeding up or slowing down a video is to convince multimedia players that your computer is slower or faster than it really is. This can be accomplished hooking timeGetTime().</p> <p>This is an extremely easy C# code to accomplish it:</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Diagnostics; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using Nektra.Deviare2; namespace DeviareTest { public partial class Form1 : Form { private int nSpeed; private uint nTime; private NktSpyMgr _spyMgr; public Form1() { InitializeComponent(); _spyMgr = new NktSpyMgr(); _spyMgr.Initialize(); _spyMgr.OnFunctionCalled += new DNktSpyMgrEvents_OnFunctionCalledEventHandler(OnFunctionCalled); } private void Form1_Load(object sender, EventArgs e) { NktHook hook = _spyMgr.CreateHook("WINMM.dll!timeGetTime", (int)(eNktHookFlags.flgOnlyPostCall)); hook.Hook(true); bool bProcessFound = false; NktProcessesEnum enumProcess = _spyMgr.Processes(); NktProcess tempProcess = enumProcess.First(); while (tempProcess != null) { if (tempProcess.Name.Equals("iexplore.exe", StringComparison.InvariantCultureIgnoreCase) &amp;&amp; tempProcess.PlatformBits == 32) { hook.Attach(tempProcess, true); bProcessFound = true; } tempProcess = enumProcess.Next(); } if(!bProcessFound) { MessageBox.Show("Please run \"iexplore.exe\" before!", "Error"); Environment.Exit(0); } } private void OnFunctionCalled(NktHook hook, NktProcess process, NktHookCallInfo hookCallInfo) { nTime++; if (nSpeed==-2) hookCallInfo.Result().LongVal = hookCallInfo.Result().LongVal - (int)(nTime * 0.2); else if(nSpeed==2) hookCallInfo.Result().LongVal = hookCallInfo.Result().LongVal + (int)(nTime * 3); } private void SlowButton_CheckedChanged(object sender, EventArgs e) { nSpeed = -2; } private void FastButton_CheckedChanged(object sender, EventArgs e) { nSpeed = 2; } } } </code></pre> <p>I just published an article with a code example showing how to do this with the Deviare hooking engine. The sample code only works with the video part (not audio) and it is available <a href="http://blog.nektra.com/main/2012/06/13/controlling-the-speed-of-youtube-flash-html5-and-desktop-videos-with-deviare-hooks/" rel="nofollow">here</a>.</p>
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    1. POHow Can I Hook a Youtube Video (Flash Player?) To Slow Down Playback?
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    1. COI just compile the code from github but I the application crashes. I couldn't find the manifest file from deviare package. Maybe that is the cause?
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    2. COPlease send the detail of the crash. Mainly two things can happen: you need to download the latsst deviare version since it was very updated and also the code is not working now because there was some change in flash or in the way YouTube is working.
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    3. COThe application crash at start with the message "Deviare test has stopping working". I noticed that the guide required a file called Devicom.x.manifest file. I could not find it in the DeviareV2 folder which I believe to be the latest version.
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