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April 23, 2014   


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FAQ

XviD FAQ

Introduction

1.1     About the XviD FAQ

1.2     Finding the latest version of the XviD FAQ

1.3     I'm still having problems after reading the XviD FAQ


Requirements

2.1     Software needed to play XviD movies in Windows

2.2     Hardware requirements to play XviD movies

2.3     Lowering image quality to reduce skipping

2.4     Lowering image resolution to reduce skipping


Installation problems

3.1     XviD codec installation problem: Error opening file for writing

3.2     XviD codec installation problem: Delete file failed, code 5

3.3     XviD codec installation problem: Installer corrupted or incomplete

3.4     XviD.dll freezes/crashes and causes Windows Explorer to close


Playback problems

4.1     XviD movies won't play and I don't know why

4.2     Incomplete XviD movies won't play in Windows Media Player

4.3     No picture, I get no video when playing XviD movies

4.4     No sound, I get no audio when playing XviD movies

4.5     Picture freezes, but sound keeps going when playing XviD movies

4.6     Picture is green/distorted/corrupted when playing XviD movies

4.7     Picture is too dark when playing XviD movies

4.8     Picture is upside-down or mirrored when playing XviD movies

4.9     Picture and sound is having problems with skipping

4.10   Sound volume is too low when playing XviD movies


Common questions

5.1     What is a codec?

5.2     What is the XviD codec?


Error messages (Windows Media Player)

6.1     Unable to download an appropriate decompressor

6.2     Unable to render video: DIV3 decompressor not found

6.3     Unable to render video: DIV4 decompressor not found

6.4     Unable to render video: DIVX decompressor not found

6.5     Unable to render video: DX50 decompressor not found

6.6     Unable to render video: MP43 decompressor not found

6.7     Unable to render video: XVID decompressor not found

6.8     No combination of filters could be found to render the stream

6.9     The file format is invalid




Introduction

1.1   About the XviD FAQ

The XviD FAQ is intended to answer common questions about the XviD codec and provide helpful information and tips on fixing common problems. The XviD FAQ may not be published at any other website without permission. Duplication of links or content is strictly prohibited. It is written and maintained by the webmaster of http://www.xvidmovies.com/.


1.2   Finding the latest version of the XviD FAQ

The latest version of the XviD FAQ will always be available at http://www.xvidmovies.com/faq/.


1.3   I'm still having problems after reading the XviD FAQ

First of all, browse through the FAQ to make sure that your problem isn't already covered. In particular we recommend reading section 4.1, which describes the most common reasons why XviD movies won't play. If you still aren't able to find the solution to your problem, try asking in the DivX.com Forums.




Requirements

2.1   Software needed to play XviD movies in Windows

In order to play XviD movies you need to install the XviD codec, DirectX and a media player which supports the codec. We recommend using Windows Media Player 6.4 or higher to play XviD movies. For information how to install the XviD codec, goto the XviD codec section.


2.2   Hardware requirements to play XviD movies

All that is needed is a fast enough computer. We don't know the exact minimum requirements, but anything less than a Pentium 300MHz running Windows 9X/NT/2000/XP is likely to encounter problems with skipping. For AMD K6/K6-2 computers we have found that the minimum requirements are higher and we recommend at least an AMD K6-2 400MHz for proper playback.


2.3   Lowering image quality to reduce skipping

If your computer isn't fast enough to play XviD movies it is possible to disable some post-processing options. Goto the File menu in Windows Media Player and select Properties (make sure that you have a XviD movie loaded or the Properties option will be disabled). Then click the Advanced tab and select the "XviD MPEG-4 Video Decoder", then click Properties. A new window with various XviD codec settings will be displayed. To disable post-processing, simply uncheck all the post-processing options. We recommend users to not change this setting unless they are having playback problems.

Please note that the above instructions only work in Windows Media Player v6.4. If your system has a newer version of Windows Media Player installed you can still access the older version to make the needed changes. Simply goto the Start menu in Windows, select "Run..." and enter "mplayer2" in the box. Then click the OK button to start Windows Media Player v6.4.


2.4   Lowering image resolution to reduce skipping

If you're having problems with skipping you can also try lowering your desktop resolution to 640x480 and see if it helps.




Installation problems

3.1   XviD codec installation problem: Error opening file for writing

This problem occurs when you try to install the XviD codec and the XviD installation program for some reason is unable to create/replace files in the Windows system directory.

If you don't have the xvid.ax file installed on your system already the problem is most likely that you don't have the required priviliges to install the XviD codec. The installation program needs to be able to create some files in the Windows system directories as well as update the system registry. Make sure you have these privileges or contact someone who has them to get help.

If you already have the xvid.ax file installed on your system you need to figure out why the installation program is unable to replace it. This can either be caused by the file attribute being set to read-only or because the codec currently is in use by another program. Make sure to close all other programs before you try to install the XviD codec. If you still get the same error message you could try to manually remove the file before you start the installation.


3.2   XviD codec installation problem: Delete file failed, code 5

This problem occurs when you try to install the XviD codec and the XviD installation program for some reason is unable to delete files in the Windows system directory.

If you don't have the xvid.ax file installed on your system already the problem is most likely that you don't have the required priviliges to install the XviD codec. The installation program needs to be able to create some files in the Windows system directories as well as update the system registry. Make sure you have these privileges or contact someone who has them to get help.

If you already have the xvid.ax file installed on your system you need to figure out why the installation program is unable to delete it. This can either be caused by the file attribute being set to read-only or because the codec currently is in use by another program. Make sure to close all other programs before you try to install the XviD codec. If you still get the same error message you could try to manually remove the file before you start the installation.


3.3   XviD codec installation problem: Installer corrupted or incomplete

If you get the error message "The installer you are trying to use is corrupted or incomplete." when you try to install the XviD codec it's because there was some problem during the downloading process that caused the installation file to become corrupted or incomplete. To fix the problem you can either try to re-download the installation file or if you're having general problems with downloading EXE files from the web you can download the following alternative ZIP version instead: Xvid-1.3.2-20110601.zip

Please note that you will need WinZIP or some other software to decompress the installation file from the ZIP archive before you can start the installation process.


3.4   XviD.dll freezes/crashes and causes Windows Explorer to close

This problem usually occurs when you're browsing a folder containing XviD videos and Explorer tries to create thumbnail previews of the videos using an outdated version of the XviD codec that's installed. When it fails you get an error message about Explorer encountering a problem with xvid.dll and having to close down (Windows Explorer has encountered a problem and needs to close).

As the xvid.dll file hasn't been used for quite some time its presence on your system suggests that you've still got an outdated version of the XviD codec installed. Just installing the latest version of the XviD codec over the old one won't fix the problem as it doesn't remove the old files and registry settings. You first need to uninstall all previous versions of the XviD codec and verify that the problem goes away. Then you should install the latest version of the XviD codec.




Playback problems

4.1   XviD movies won't play and I don't know why

The most common reason that downloaded movies don't work is because the download is incomplete. To find out if a movie is incomplete you should download GSpot and open the movie you are having problems playing. If the "Stat" field for the file says that the file length is correct the file is complete. If the "Stat" field for the file says that the file is truncated the file is incomplete and you need to resume the download. For information how to watch an incomplete movie, see section 4.2.

If the movie is complete and it still won't work it's probably because you don't have the required video/audio codecs installed on your computer. If you're having problems with the video you can find instructions how to determine what video codec is required to play the movie in section 4.3. If you're having problems with the audio you can find instructions how to determine what audio codec is required to play the movie in section 4.4.

If you've got all the required codecs installed on your system and you still can't play the movie it's possible that your installed codecs aren't working properly. We've provided a small XviD video clip with no sound that can be used to test your installation of the XviD codec. Download it and try to watch it, but make sure that it is complete (376832 bytes in size). If the small XviD video clip plays fine then you can conclude that there is some problem with the movie you have downloaded. If you experience the same errors/problems with the small clip then your installed codec isn't working properly and you need to reinstall the XviD codec. We recommend uninstalling all previous versions of the XviD codec before you upgrade to avoid possible conflicts with the new version of the codec.


4.2   Incomplete XviD movies won't play in Windows Media Player

There is a program called DivFix which can be used to rebuild the missing index part so that you can watch partially downloaded (incomplete) XviD movies. The program can be downloaded from the Software section. Just remember to strip the index before you resume the download or the file will be completely corrupted and impossible to repair.


4.3   No picture, I get no video when playing XviD movies

This problem occurs when you try to watch a movie and the video player you are using is unable to find the needed video codec. You might be able to listen to the sound but no video is shown. Fortunately, there is an easy way to fix this problem. All AVI files contain a FourCC code in the header of the file, which can be used to identify the video codec required to play the movie.

To find out which video codec you're missing you should download GSpot and open the movie you are having problems playing. The program will give you information about what codecs are needed to play the movie and if you have them installed on your computer. However, please note that even though GSpot might say that you have compatible codecs installed this information isn't always correct. To see which codec is actually used to decode the video, use the "Render" option at the bottom of the program. If GSpot says "Rendering failed" or "Partial failure" then you don't have any compatible video codec installed, so you need to use the FourCC code to lookup the codec you need to download and install in the following list:

FourCC (4CC)

Video codec

DIVX, DIV3, DIV4, DX50 DivX codec v8.0 for Windows XP, Windows Vista, Windows 7

DivX codec v5.2.1 for Windows 98, Windows ME

DivX codec v6.6.1 for Mac OS X

DivX codec v5.1.1 for Mac OS

XVID XviD codec v1.3.2 for Windows

XviD codec for Mac

MP43

SMR codec

If the video codec you need isn't listed above, check out FourCC.org for a more complete list of codecs. Please note that there doesn't exist any video codec that uses the FourCC code 0. If you've downloaded a movie with the FourCC code 0 it's either fake or corrupt and you won't be able to watch it.


4.4   No sound, I get no audio when playing XviD movies

First of all, you need to figure out if the problem is with the movie you are trying to play or your system configuration. You can do this by trying to play an MP3 or another movie and see if the sound works. If it does you should keep on reading for more information how to fix the problem. Otherwise you have to figure out what's wrong with your system configuration.

It's important to understand that video and audio are two separate things, which when combined make up movies. A movie consists of a video stream for the picture and an audio stream for the sound. The XviD codec is what makes it possible to decode the video stream, but it has nothing to do with decoding the audio stream. If the sound in a movie isn't working you have to find out which audio codec is missing and install it.

To find out which audio codec you're missing you should download GSpot and open the movie you are having problems playing. The program will give you information about what codecs are needed to play the movie and if you have them installed on your computer. However, please note that even though GSpot might say that you have compatible codecs installed this information isn't always correct. To see which codec is actually used to decode the audio, use the "Render" option at the bottom of the program. If GSpot says "Rendering failed" or "Partial failure" then you don't have any compatible audio codec installed, so you need to use audio codec name to lookup the codec you need to download and install in the following list:

Compression

Tag (hex)

Tag (dec)

Audio codec

MPEG-1 Layer 3 Codec

tag 55 tag 85 MP3 codec
DivX ;-) Audio Compressor

tag 161 tag 353 DivX ;-) audio
AC3 Codec

tag 2000 tag 8192 AC3 codec
Ogg Vorbis Codec

tag 674F tag 26447 OGG codec

Please note that the new DivX® codec doesn't include support for the DivX ;-) Audio format, so you won't be able to watch these movies with sound simply using the new DivX® codec. The only way to watch these movies with sound is either using the original DivX codec v3.11 alpha, or by installing the DivX ;-) audio decompressor separately.


4.5   Picture freezes, but sound keeps going when playing XviD movies

The XviD movie that you are trying to play contains errors. Some of the frames in the movie are invalid and when you try to play the movie the picture freezes because of these errors. The sound is able to keep on playing since it isn't as sensitive to small errors as the video. The invalid frames are usually caused by resuming downloads. To fix the invalid frames you can either try to download the movie again, but this won't help if your source also has a corrupted movie. In that case the only way to fix the movie is to load the movie into VirtualDub and manually edit/delete the invalid frames. There exists a workaround called DivX AntiFreeze, which once installed will avoid the permanent freezings during playback in Windows Media Player. However, it does not fix the invalid frames in the clip.


4.6   Picture is green/distorted/corrupted when playing XviD movies

This problem usually occurs when you try to play an XviD movie that is encoded with a newer version of the XviD codec than the one installed on your system (the codec installed on your system is outdated). If you don't have the latest version of the XviD codec installed already, make sure to upgrade before trying any of these suggestions. We recommend uninstalling all previous versions of the XviD codec before you upgrade to avoid possible conflicts with the new version of the codec.

If simply upgrading the XviD codec doesn't help, the problem is most likely that another DirectShow filter which isn't fully compatible with XviD is overriding the XviD codec for playback. To find out which filter/codec is actually being used to decode the movie you should download GSpot and open the movie you are having problems playing. After loading the movie into GSpot, use the "Render" option at the bottom of the program and look at the value of the "Video path". If the video path says "XviD MPEG-4 Video Decoder" then the XviD codec is being used to decode the movie, so either the installed version of the codec is outdated or the file is damaged/corrupt. If the video path says "DivX Decoder Filter", "ffdshow MPEG-4 Video Decoder", or anything else then you need to figure out how to disable this filter/codec.

To disable the "DivX Decoder Filter" from decoding XviD videos, simply goto the Start->Programs->DivX->DivX Codec folder and select the Configuration option. Then switch to the "Decoder" tab and uncheck the "Support decoding of Generic MPEG-4 video" checkbox. This should tell your computer to use the installed XviD codec to decode XviD movies instead of the DivX® codec.

To disable the "ffdshow MPEG-4 Video Decoder" from decoding XviD videos, simply goto the Start->Programs->ffdshow folder and select the Configuration option. Then switch to the "Codecs" section and change the XviD setting from "libavcodec" to either "disabled" or the "XviD" option. This should tell your computer to use the installed XviD codec to decode XviD movies instead of FFDShow.


4.7   Picture is too dark when playing XviD movies

If the picture is too dark when playing XviD movies it is possible to change the brightness setting. Goto the File menu in Windows Media Player and select Properties (make sure that you have a XviD movie loaded or the Properties option will be disabled). Then click the Advanced tab and select the "XviD MPEG-4 Video Decoder", then click Properties. A new window with a brightness slider will be displayed. If you move the slider to the left the picture will become darker. If you move the slider to the right the picture will become brighter. Experiment a bit to find the value that works best for you.

Please note that the above instructions only work in Windows Media Player v6.4. If your system has a newer version of Windows Media Player installed you can still access the older version to make the needed changes. Simply goto the Start menu in Windows, select "Run..." and enter "mplayer2" in the box. Then click the OK button to start Windows Media Player v6.4.


4.8   Picture is upside-down or mirrored when playing XviD movies

If you don't already have the latest version of the XviD codec installed, make sure to upgrade before trying any of these suggestions. We recommend uninstalling all previous versions of the XviD codec before you upgrade to avoid possible conflicts with the new version of the codec.

If the video still plays upside-down or mirrored after upgrading, it's likely that you have some conflicting DirectShow filter(s) installed that are flipping the video. The two most common filters that cause these type of problems are the Bicubic Resize filter (bicubic_resizer.ax) and the G400 filter (divxg400.ax). To check if any of these filters are installed, simply look for the files in your C:\Windows\System32 directory (on the drive where Windows is installed). If you find any of these filters installed, simply goto the Start menu in Windows and select "Run...", then enter "regsvr32 /u filename.ax" in the box and click the OK button to unregister the filter.

Another way to fix the problem is to simply reconfigure the XviD codec to flip the video. To do this, goto the Start menu in Windows and select "Run...", then enter "rundll32.exe xvid.ax,Configure" into the box and click the OK button to launch the XviD Configuration tool. Try to change the "Flip video" option and see if it fixes the problem.


4.9   Picture and sound is having problems with skipping

The reason for this is most likely that your computer isn't fast enough to play XviD movies. You can try disabling some post-processing options and lower the resolution as described in section 2.3 and 2.4. If this doesn't fix the problem, we recommend users to try BSPlayer, since it uses considerably less CPU and memory than Windows Media Player. The program can be downloaded from the XviD players section.


4.10   Sound volume is too low when playing XviD movies

We've found that the problem with really low volume in XviD movies is usually caused by the movies using the AC3 audio codec. The default volume for the AC3 codec is quite low, so raising the regular volume controls might not be enough for some movies. To fix the problem, simply goto the Start menu in Windows, select "Settings" and then the "Control Panel". If you have the AC3 codec installed on your system you should see the "AC3 Filter" listed there. Simply open the "AC3 Filter" and from there you should be able to change the Master volume, and even the volume of individual channels such as the Voice channel.




Common questions

5.1   What is a codec?

The word codec is short for compressor/decompressor. When you install a video codec on your system it basically works as an add-on to your system with instructions how to compress and decompress video in that format. If the needed codec is missing you will receive an error message that Windows Media Player is unable to download an appropriate decompressor. For more information about this problem, see section 6.1.


5.2   What is the XviD codec?

XviD is the name of a popular new video codec which is being developed as an open source project by volunteer programmers from all over the world. The codec is just like the DivX® codec based on the highly efficient MPEG-4 compression standard for video. The XviD format is still not as widely used as the DivX® format, but as it's fully compliant with the same MPEG-4 standard XviD movies usually play in DVD players that support the DivX® format. To download and install the codec, goto the XviD codec section.




Error messages (Windows Media Player)

6.1   Unable to download an appropriate decompressor

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. You might be able to listen to the sound but no video is shown. This either means that you haven't got the required video codec installed or that the installed codec isn't working properly. To figure out which video codec you need to install, see section 4.3.


6.2   Unable to render video: DIV3 decompressor not found

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. In order to play the movie you need to install the DivX® codec which contains a DIV3 decompressor. For information how to install the DivX® codec, goto the DivX codec section.


6.3   Unable to render video: DIV4 decompressor not found

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. In order to play the movie you need to install the DivX® codec which contains a DIV4 decompressor. For information how to install the DivX® codec, goto the DivX codec section.


6.4   Unable to render video: DIVX decompressor not found

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. In order to play the movie you need to install the DivX® codec which contains a DIVX decompressor. For information how to install the DivX® codec, goto the DivX codec section.


6.5   Unable to render video: DX50 decompressor not found

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. In order to play the movie you need to install the DivX® codec which contains a DX50 decompressor. For information how to install the DivX® codec, goto the DivX codec section.


6.6   Unable to render video: MP43 decompressor not found

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. In order to play the movie you need to install the SMR codec which contains a MP43 decompressor. You can download the SMR codec from the Software section.


6.7   Unable to render video: XVID decompressor not found

This error occurs when you try to watch a movie and Windows Media Player is unable to find the needed video codec. In order to play the movie you need to install the XviD codec which contains a XVID decompressor. For information how to install the XviD codec, goto the XviD codec section.


6.8   No combination of filters could be found to render the stream

This error occurs when you try to watch a movie and Windows Media Player is unable to render the video stream. The XviD movie that you are trying to play is either incomplete or corrupt and the XviD codec doesn't support playback of incomplete XviD movies, so make sure that you have the whole file before you try to watch it. For a possible workaround, see section 4.2.


6.9   The file format is invalid

This error occurs when you try to watch a movie and Windows Media Player detects that the file format is invalid. The XviD movie that you are trying to play is either incomplete or corrupt and the XviD codec doesn't support playback of incomplete XviD movies, so make sure that you have the whole file before you try to watch it. For a possible workaround, see section 4.2.







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