Solved the pop-up noise problem during HD movie playback in Windows 7.

"Windows 7 has been released. There are so many questions. How do you trust it ?" -- This is a common reason to reject Windows 7 users who stick to Windows XP. For such a problem, I usually ask: "Windows XP has been released for many years, so now there is no problem ?" I am not really angry with some netizens. In many cases, the problems in Windows 7 are not related to compatibility. However, compared with Windows XP, Windows 7 has made changes in system settings, but such changes are not clear to some users, as a result, the user was misunderstood as "Windows 7 is not compatible "......
I have many users who regard system settings as system compatibility issues. When he watches HD movies in Windows XP, the player works normally, the picture is smooth, and the sound quality is also very good, however, when switched to the Windows 7 platform, the player will often experience sound bursts and noises. : In Windows 7, is there compatibility between high definition sound bursts and noises? After the above problems are eliminated, many users blame "Windows 7 and player" or "Windows 7 and audio/video driver" for poor compatibility. In fact, this is wrong, not because of compatibility, but because Windows XP and Windows 7 have different priority settings in multimedia services.

To test and solve such problems, I will perform tests on the same machine in the following environment.

: Test environment

First, I want to explain to you that the test in this article is not to verify the extent to which the HD video is played in Windows 7 (it is an objective fact that such a problem exists ), the goal of the author is to first test and then provide a solution.

The test results show that there is no burst sound or noise when the player is used to play HD videos in the same hardware environment and Windows XP, on the Windows 7 platform (some films), there is a burst of sound and noise.

It should be particularly noted that the sound bursts and noises that people are used to when playing high-quality MP3 files. The reason why I used high-definition films for testing is "accidental.

Many users are arguing about HD playback in Windows 7 and Windows XP, who has a smoother picture quality and who has no cards, so I have made a "long" comparison, some HD media files have experienced "sound slowness" in Windows 7 systems under several tests in multiple hardware environments. This situation is exactly the same as the solution for playing high-quality MP3 files. Therefore, I will take the existing materials as an example to share with you the solution.

In my test file, apart from the current movie of the subway and movie of McDull, I used high-definition films such as transformers 1, Transformers 2, delivery 4, and 13 Rohan for tests. (This article was tested on July 22, October 19) both the online statements and test results show that there is a "problem" in playing HD videos in Windows 7, but there is no similar problem in Windows XP. Does this mean there is a problem with the compatibility of Windows 7? The answer is no.

The reason for the above problem is that Microsoft gives multimedia playback files a higher priority in Windows 7. A common saying is that Microsoft tries to optimize multimedia (playback) performance by controlling the CPU in Windows 7. This method is acceptable for computers with high hardware configurations, however, for machines with poor configuration, this method may not be the best.

After finding out the cause, we can modify the system settings to solve the problem.

Step 1: run the Registry Editor, expand to HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ services \ Audiosrv, and double-click "DependOnService" in the right window ", then, delete "MMCSS deletion" in the pop-up dialog box ".

: Delete MMCSS (do not delete other values)

After modification, save the settings and exit. Such modification is only the first step. To completely solve the problem, you still need to proceed to the next step.

Step 2: Enter msconfig in the "search programs and files" box in the Start Menu, switch to the "service" tab in the pop-up dialog box, find and deselect "Multimedia Class Scheduler ".
 
: Uncheck "Multimedia Class Scheduler"

After the modification, click OK to save the settings and exit.

Restart the computer so that the preceding two steps take effect.

Now, in Windows 7 again, there is no longer a problem of "sound dull" when playing HD videos.

The above test is passed in the 32-bit Windows 7 flagship edition.

Post:

During the trial of Windows 7, I always insisted that "Windows 7 is better than Windows XP". This is reflected in the operability, ease of use, and security of Windows 7, details. During the transition from Windows 98 to Windows XP, many users can also pick out all kinds of Windows XP problems, but such problems need to be viewed from a "development perspective. After all, any new software or system will have its problems, but it also has its advantages.

Once again, the "sound burst" and "noisy" mentioned in this Article do not mean the problems that occur when playing high-quality MP3 files. However, you can solve the problem when playing high-quality MP3 files in the same way as when playing HD videos.