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qtvideo.txt
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1995-04-25
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6KB
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113 lines
User Guide to the QTW.INI
INTRODUCTION
As was previously mentioned, QuickTime for Windows achieves its perfor-
mance advantage by checking your hardware configuration, and if it recog-
nizes the video card's chipset as one that can be optimized, it attempts
direct hardware access. As an end user, it is relatively easy to open
your QTW.INI file and gets some important information from it. From the
Program Manager, select "Run" from the File menu. In the command line,
simply type, "QTW.INI". Notepad should open up with your copy of the
QTW.INI file. The top section contains most of the information we need.
It may look something like this:
[QuickTime for Windows]
VHDW Component=Base Apple VHDW Component
Video Hardware=8-bit palettized pixels; S3 801 or 805 internalhardware
support
Implementation=Full
[Video]
PreferredComponent=C:\WINDOWS\SYSTEM\QTVHDW.QTC
Lets examine each line of the .INI file, and see what significance it has
on theoverall performance of QuickTime. The first line, [QuickTime for
Windows], is a section header whose information directly indicates
QuickTime'shardware support options. The second line, VHDW Component=
Base AppleVHDW Component, indicates that QuickTime is using a standard base
level hardware support component in order to write directly to the hardware.
Thenext line, Video Hardware=8-bit palettized pixels; S3 801 or 805
internalhardware, is very important in regards to performance. If this
line hasinformation in it, it means that QuickTime has recognized the
video hardware. In this case, QuickTime has recognized this chipset as
being either a S3 801 or 805 chipset. It will achieve the highest
quality performance for the PC's video bus. For example, if you have
direct hardware support, but have anISA card, you will get the maximum
performance allowable for the data transfer bandwidth of an ISA card. If
you have a supported VLB card, youshould get the very best video
playback performance. The next line of the fileindicates that all
QuickTime options are installed and available. This lineshould always say
"Full".
The next section is the Video section. The line directly under it will
specifythe path to the component that QuickTime is using in order to
write directlyto the video frame buffers. Make sure never to delete this
file, or QuickTimewill have to resort to GDI level performance.
Now lets look at a file from a machine that does not offer direct hardware
support.
[QuickTime for Windows]
Implementation=Full
VHDW Component=None
Video Hardware=Not directly supported
As you can see, quite a bit of information is left out here. You will
notice thatno VHDW component is specified, and the Video Hardware section
indicated that it is not directly supported. There is also no [Video]
section inthis document. Not having direct hardware support does not
necessarilymean bad performance though. If you have a machine without
direct hardware support, but you have a VLB card, you will not see
optimal performance, but the high data transfer rate of the card should
yield good performance. If however, you have an non-optimized chipset, and
it is also andISA card, you will notice some performance degradation due
to the data busbottleneck. A section near the end of the file may also
have some important significance. Let's take a look:
[Override]
oldVersion=38
This section lets you know that you have an older version of QuickTime on
your drive. Generally, it's not good to have older versions of QuickTime around. The qtold.dll checks for older versions of QuickTime on your drive
whenever QuickTime is initialized. If it finds one, it adds a digit to
thiscounter. Whenever old Version gets to a multiple of ten, a warning
messageappears after QuickTime is initialized that advises the user of
the older version. To determine if you have an older version floating
around, set thisnumber to one that ends in 9, and launch the Movie Player.
If you got thewarning dialogue, you have an older version on your drive.
The best way toget rid of older versions of QuickTime is to run the
latest QuickTime installer. It automatically searches for older version,
and gives you the option of getting rid of them.
TROUBLESHOOTING
While the QTW .Ini file's main purpose is to record and track your
machine'shardware specifications, there are some other uses for it that
can help increaseperformance for machines experiencing playback problems.
As was previously mentioned, the Video section of the .ini file controls
thepreferred playback driver for the video data tracks. If you have
supportedhardware, the information in this section should have a path
statement tothe preferred QuickTime component that will be used to
provide directhardware access. If you don't have supported hardware, and
you areexperiencing playback problems with video, a simple edit in this
section willhelp solve performance problems.
If you have a PCI video card, QuickTime 2.0 does not currently have
supported drivers to optimize access to the hardware. If you have a PCI
card, youmay be experiencing some playback performance problems. Adding
thefollowing lines to the QTW .INI file may help alleviate those issues.
Here are the lines to add.
You should not already have a [Video] section and should add these lines
[Video]
Optimize=Driver
That's it. Save and close the .ini file and the next time you launch QuickTime
you should see some performance gains.
If you have some other video card and your performance is not what you
would expect for the hardware, try the above solution. If that still does
not dothe job, try this modification to the file instead:
[Video]
Optimize=BMP
You should remember to save and close the file and relaunch QuickTime to
examine the results.