Measured to solve the problem of Windows 7 popping noise

            There are a lot of users around the author who treat the system as a system compatibility issue. When he watches HD movies under Windows XP, the player works normally, the picture is smooth, and the sound quality is very good, but when you go to the Windows 7 platform After that, the player often has popping and noise. Is there a compatibility issue with Windows 7 playing HD with pops and noise? For the above problems, once the player's own problem is ruled out, many users are blamed on "Windows 7 and the player" or "Windows 7 and the sound card driver" is not compatible. In fact, this is wrong, not a problem caused by compatibility, but the difference between Windows XP and Windows 7 in the multimedia service priority setting. In order to test and solve such problems, the authors tested on the same machine and on the following environment.

First of all, I explained that the test in this article is not to verify the extent of pops and noises in HD playback under Windows 7. (There is an objective fact that such problems exist), the author's purpose is mainly to test first. And then give a solution.

Test results show that the same movie file in the same hardware environment, Windows XP system using the player to play high-definition movies, there is no popping and noise, and Windows 7 platform (some movies) There have been cases of pops and noises.

It is important to note that popping and murmurs that you are used to talking about generally refer to what happens when you play a high-quality MP3 file. The reason why I use HD movies for testing is "accidental" behavior. Since many users are arguing that Windows 7 and Windows XP play HD, who's picture quality is smoother, who "doesn't card", the author did this for a relatively long-term comparison, in front of multiple hardware environments Under several tests, some HD media files have appeared in the Windows 7 system "slow voice". This situation is completely consistent with the method of playing high-quality MP3 files. Therefore, the author takes the existing data as an example and shares the solution with everyone. In the test files I have done, in addition to the current "Muse of the Subway" and "McDull Dangdang", I used "Transformers 1", "Transformers 2", "Taxi Express 4", "Thirteen Arhats" I have tested HD movies. (This article was tested on October 19th)

The statement and test results on the network indicate that there is a problem with HD video playing under Windows 7 system, but there is no similar under Windows XP system. problem. Does this mean that there is a problem with Windows 7 compatibility? the answer is negative. The reason why the above mentioned problems arise is because Microsoft gives higher priority to multimedia playback files in Windows 7 systems. The common saying is that Microsoft tried to optimize multimedia (playback) performance by controlling the CPU in Windows 7. This way is fine for computers with high hardware configuration, but for machines that are not well configured, this way Not necessarily the best. Find out the reason, 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, double-click “DependOnService” in the right window, and delete “MMCSS Delete” in the pop-up dialog box.

Delete MMCSS (do not delete other values) After the modification is completed, save the settings to exit. This modification is only the first step. To solve the problem completely, you need to proceed to the next step. In the second step, enter msconfig in the Start menu <;Search Programs and Files" box, and in the pop-up dialog box, switch to the “Services” tab and find and uncheck “Multimedia Class Scheduler”.

Uncheck the “Multimedia Class Scheduler”. After the modification, click the “OK” button to save the settings and exit. Restart your computer so that the two-step modification described above takes effect. At this point, once again tested under Windows 7 system, playing HD movies no longer has the problem of "slow voice". The above test was tested in the Windows 7 Ultimate 32-bit system. After editing: In the process of trying Windows 7, I always insisted that “Windwos 7 is better than Windows XP”, this view is reflected in the operability, ease of use and security of Windows 7, each In detail. In the transition from Windows 98 to Windows XP, many users can also pick out all kinds of problems with Windows XP, but such problems need to be viewed with "development vision". After all, any new software, new system will have its problems, but at the same time it has its advantages. Again, the "pop" & rdquo; & quoquo; murmurs are not the problems that occur when playing high quality MP3 files. However, problems that occur when playing high-quality MP3 files, and problems that occur when playing HD movies, can be solved in the same way.