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help_codec.txt
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1997-01-31
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This is a summary of information contained in Microsoft's
Knowledge Base article ID: Q141801
Troubleshooting Audio CODECS in Windows 95
Missing CODECS
Windows 95 includes 32-bit versions of several common CODECS. These
32-bit CODECS are installed by default during Windows 95 Setup when
a sound card is installed in the computer, and are used by multimedia
programs even if a 16-bit version of the same codec is available.
To verify that the 32-bit CODECS included with Windows 95 are
installed, follow these steps:
1. In Control Panel, double-click Add/Remove Programs.
2. Click the Windows Setup tab.
3. Click Multimedia, and then click Details.
4. Verify that the Audio Compression check box is selected. If it
is not selected, click the check box to select it, and then click
OK.
PhoneFree uses the following 32-bit CODECS included with Windows 95:
DSP Group Truespeech Software
Microsoft Groupe Special Mobile (GSM) 6.10
You can verify that these codecs are installed by following these
steps:
1. In Control Panel, double-click Multimedia.
2. Click the Advanced tab.
3. Double-click the Audio Compression CODECS branch to expand it.
If the codec used to compress the file is not listed, install that
codec using the Add New Hardware tool in Control Panel. To do so,
follow these steps:
1. In Control Panel, double-click Add New Hardware.
2. Click Next, click No, and then click Next.
3. Click Sound, Video, And Game Controllers, and then click Next.
4. To install the GSM 6.10 CODEC, click Microsoft Audio CODECS in the
Manufacturers box, and then click the GSM entry in the Models box.
To install the DSP Group Truespeech Software codec, click DSP Group
in the Manufacturers box, and then click TrueSpeech(TM) Software
CODEC in the Models box.
5. Click Next, and then click Finish.
Disabled or Damaged CODECS
If you still cannot play a particular .wav file after verifying that the
codec used to compress the file is installed, the codec may be disabled
or damaged. To verify that a particular codec is enabled, follow these
steps:
1. In Control Panel, double-click Multimedia.
2. Click the Advanced tab.
3. Double-click the Audio Compression CODECS branch to expand it.
4. Click the codec used to compress the file that you are attempting
to play, and then click Properties.
5. Verify that the Use This Audio Codec option is selected.
To ensure that you are not using a damaged codec, follow these steps to
reinstall a codec:
1. In Control Panel, double-click Multimedia.
2. Click the Advanced tab.
3. Double-click the Audio Compression CODECS branch to expand it.
4. Click the codec used to compress the file that you are attempting to
play, and then click Properties.
5. Click Remove, and then click Yes.
6. Restart your computer.
7. In Control Panel, double-click Add New Hardware.
8. Click Next, click No, and then click Next.
9. Click Sound, Video, And Game Controllers, and then click Next.
Install the codec used to compress the file that you are attempting to
play. To install the GSM 6.10 CODEC, click Microsoft Audio CODECS
in the Manufacturers box, and then click the GSM entry in the Models
box. To install the DSP Group Truespeech Software codec, click DSP
Group in the Manufacturers box, and then click TrueSpeech(TM) Software
CODEC in the Models box.
Click Next, and then click Finish.
Conflicts Between 16-Bit and 32-Bit CODECS
If the 32-bit version of an audio codec that Windows 95 needs to play
a particular .wav file is not installed or is disabled, Windows 95 uses
the 16-bit version of the codec if it is available. If the 32-bit version
of the codec is installed, Windows 95 uses this version by default. However,
you may experience problems when both the 16-bit and 32-bit versions of a
particular codec are installed.
The following 16-bit audio CODECS are installed by the run-time versions of
Microsoft Video for Windows, Microsoft Windows Sound System, and many other
Microsoft multimedia programs:
Microsoft ADPCM
Microsoft IMA ADPCM
DSP Group Truespeech Software
These 16-bit CODECS appear in the [Drivers] section of the System.ini file,
but do not appear when you double-click the Multimedia icon in Control Panel,
click the Advanced tab, and then expand the Audio Compression CODECS branch
of the Multimedia Drivers tree. To disable a 16-bit codec, remark or remove
the line in the System.ini file that corresponds to that codec. After disabling
the 16-bit version of the codec, you should reinstall the 32-bit version using
the steps described in the "Disabled or Damaged CODECS" section above.
The following lines in the System.ini file correspond to the 16-bit versions of
the Microsoft ADPCM, Microsoft IMA ADPCM, and DSP Group Truespeech Software CODECS,
respectively:
[Drivers]
msacm.msadpcm=msadpcm.acm
msacm.imaadpcm=imaadpcm.acm
msacm.trspch=ts_soft.acm
If you are using a 16-bit program in Windows 95, you may want to disable the
32-bit version of a particular codec, instead of disabling the 16-bit version.
To do so, follow these steps:
1. In Control Panel, double-click Multimedia.
2. Click the Advanced tab.
3. Double-click the Audio Compression CODECS branch to expand it.
4. Click the codec you want to disable, and then click Properties.
5. Click the Do Not Use This Audio Codec option to select it.
6. Click OK.