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DVI2USB 3.0
User manual
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Epiphan DVI2USB 3.0 User manual

User Guide
Epiphan DVI2USB 3.0
Release 3.30.2
September 28, 2015
UG108-01
Terms and Conditions
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Copyright © 2015 Epiphan Systems Inc. All Rights Reserved.
THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET OR PRODUCT INSTALLATION SOFTWARE PACKAGE THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSES OR LIMITED WARRANTY, CONTACT YOUR EPIPHAN REPRESENTATIVE FOR A COPY.
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For additional terms and conditions, please refer to additional sections in this document.

Thank You for Choosing Epiphan!

At Epiphan Video (“Epiphan”), product function and quality are our top priority. We make every effort to make sure that our products exceed your expectations.
Product Feedback
Your feedback is important! We regularly contact our customers to ensure our products meet your performance and reliability requirements. We strive to continually enhance our products to accommodate your needs. Please let us know how you think we can improve our products by emailing your suggestions to
info@epiphan.com.
Specifications
Go to the DVI2USB 3.0 product page on the Epiphan website to get the most recent product specifications and additional information about DVI2USB 3.0.
Warranty
All Epiphan Systems products are provided with a 100% return to depot warranty for one year from the date of purchase.
Technical Support
Epiphan’s products are backed by our professional support team. If you are having issues with your product, please gather details about your system and contact our team by:
l Emailing support@epiphan.com
l Live chat via the link on our support site http://www.epiphan.com/support/
l Phone toll free at 1-877-599-6581 or call +1-613-599-6581
Be sure to include as much information about your problem as possible. Including:
l Problem description
l Details of the video or audio source (type, connection, resolution, refresh rate, etc.)
l Product serial number
l Product firmware version (if applicable, from web admin interface)
l Product LED lights
Copyright © 2015 Epiphan Systems Inc. All Rights Reserved.

DVI2USB 3.0 Release Notes

Epiphan Video is happy to announce release 3.30.2 for DVI2USB 3.0. This maintenance release includes the following updates.
Updated default EDID
DVI2USB 3.0 now has better interoperability with digital video cameras thanks to an updated default EDID.
Improved power management
Power management improvements mean that DVI2USB 3.0 now supports a wider range of USB host controllers.
Online help
DVI2USB 3.0 now has searchable online HTML help. Choose your video grabber from the Epiphan support
page for a link to online help.
Improved audio support (Windows and Linux only)
DVI2USB 3.0 now has the ability to perform audio resampling and has cleaner audio at all frequencies. Additionally, support is added for 44.1kHz and 32 kHz audio over HDMI.
Windows 10 support and updated signing process (Windows)
Epiphan drivers are supported on Windows 10, using SHA-2 signing. Upon moving to this new signing mechanism, we have dropped support for older platforms Windows XPand Windows Vista. If you're using Windows 7, ensure it is up to date to support with drivers signed with SHA-2.

Resolved issues

Among numerous small bug fixes and tweaks, this firmware and driver release for DVI2USB 3.0 fixes the following important issues found in earlier releases or Beta releases.
l Improved Mac OS support through use of new signing keys. As a result, it's also no longer necessary to
turn on security settings permitting application installation for apps downloaded from "Anywhere" before installing the Epiphan software package.
l Improved video and audio capture, resolving an issue where capture was occasionally unstable when
capturing signals that include embedded audio.

Limitations and Known Issues

This section includes known issues or limitations that affect functionality or usability and ways that you can work around these limitations.
l Video grabber may not be recognized by the system after reboot. This problem affects Mac OS more
than Windows or Linux. Workaround: Physically disconnect the video grabber from the computer's USBport and reconnect it.
If this workaround poses a problem for your specific use case, consider purchasing a new DVI2USB 3.0; a hardware update resolved this problem permanently for devices with serial number 358800 and higher.
l Capturing HDMI sources with Adobe RGB 32 color space (argb32) can cause image corruption.
Workaround:If you see image corruption with this color space, switch to another color space.

Table Of Contents

Thank You for Choosing Epiphan! ii
DVI2USB 3.0 Release Notes iii
Resolved issues iii
Limitations and Known Issues iii
Table Of Contents v
Start here 1
What is DVI2USB 3.0? 2
What's in the Box? 4
System requirements 6
Quick start 7
DVI2USB 3.0 on Linux 13
Physical attributes 15
Indicator LED details 17
Troubleshoot 18
Configure your device 20
Windows 20
Mac 20
DirectShow video adjustments (Windows) 21
QuickTime video adjustments (Mac) 23
Visual video adjustments 25
Set VGAmodes 28
Advanced adjustments 30
Epiphan Capture Tool 32
Epiphan Capture Tool (Windows) 33
Windows menus 35
File menu (Windows) 35
Edit menu (Windows) 36
View menu (Windows) 36
Capture menu (Windows) 37
Tools menu (Windows) 40
Help menu (Windows) 42
Epiphan Capture Tool (Mac) 44
Mac menus 46
v
VGA2USB menu (Mac) 46
File menu (Mac) 47
Edit menu (Mac) 48
View menu (Mac) 49
Tools menu (Mac) 49
Window menu (Mac) 50
Help menu (Mac) 51
Toolbar 53
Copy, save or print a snapshot 55
Record a video 58
Crop the captured image 63
Update device EDID 65
Configure display options 68
Windows only features 72
Status bar (Windows only) 72
Pause video capture 74
Record as a series of images 74
Configure audio 78
Configure optional recording settings 81
Add a watermark 82
Command line options 85
Sharing / streaming demo tool 86
Upgrade your drivers and software 92
Software and Documentation License 93
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DVI2USB 3.0 User Guide Start here

Start here

Use the topics in this section of the user guide to get started quickly with your DVI2USB 3.0.
Review What's in the Box?, get a system overview in What is DVI2USB 3.0?, ensure your system meets the
System requirements and get your video grabber installed and working right away using the Quick start
1
DVI2USB 3.0 User Guide What is DVI2USB 3.0?

What is DVI2USB 3.0?

DVI2USB 3.0™ is Epiphan's professional-series external DVI-I video grabber. In a nutshell, it captures images and video from VGA, HDMIand DVI-I video sources and digitizes them on your laptop or workstation via connection to a USB 3.0 port.
The video capture workstation can record and/or stream the resulting uncompressed diagnostic-quality images and videos. On Windows, both audio and video capture is supported for HDMI sources. Thanks to EpiphanVideo capture technology, this small, portable product connects directly to your computer's USB 3.0 port - no need for a large workstation with a free peripheral component interface (PCI) slot.
DVI2USB 3.0 captures video and audio from any single link DVI, unencrypted HDMI, or VGA source. Meeting greater demands for transferring larger files at faster speeds, this external video grabber supports USB 3.0 technology, capable of transferring uncompressed data with speeds of up to 5.0 (Gbits/s) - about ten times faster than USB 2.0.
In practice transfer speeds are dependent on factors such as USB load and hardware configuration.
DVI2USB 3.0 is versatile and can be used with multiple workstation configurations. It is backward compatible with USB 2.0 connections, however it transfers video at a reduced frame rate when using USB 2.0.
Using the included Epiphan Capture Tool, DVI2USB 3.0 captures full 1080p HD at 30 frames per seconds and supports resolutions up to 1920×1200. When working with third-party software, such as Windows Media Encoder with YUV 4:2:0 chroma sub-sampling, 1080p video is captured and recorded 60 frames per second.
For more information about maximizing the frame rate when capturing, recording and streaming video using third-party applications, refer to the How to Record Video using Window Media Encoder tutorial on Epiphan’s website.
2
DVI2USB 3.0 User Guide What is DVI2USB 3.0?
The DVI2USB 3.0 video grabber is fully compatible with DirectShow in Windows, Video4Linux in Linux, and QuickTime in Mac OS.This means you can use it with a number of different third party applications for capturing, recording and streaming video.
DVI2USB 3.0 is part of Epiphan’s complete line of video and audio signal capture products. For more information about all Epiphan’s video signal capture products, refer to the USB Video Grabbers page on the EpiphanVideo website.
3
DVI2USB 3.0 User Guide What's in the Box?

What's in the Box?

The DVI2USB 3.0 package includes the following
1. DVI2USB 3.0 video grabber (read more, Physical attributes)
2. One DVI-I cable
3. One VGA to DVIcable
4. One HDMI to DVI adapter
5. One USB 3.0 cable
Table 1 Description of included cables (images for identification only, color and appearance may vary)
Image Name Description
DVI-I cable Connects DVI sources to the video grabber.
VGA to DVIcable
HDMI to DVIadapter
Connects VGA (or Component, if used with a converter) signals to the video grabber.
Connects HDMI sources to the DVI-I cable for connection to the video grabber.
4
DVI2USB 3.0 User Guide What's in the Box?
Image Name Description
High speed transfer cable that connects the
USB 3.0 cable
video grabber to your capture workstation or laptop computer.
5
DVI2USB 3.0 User Guide System requirements

System requirements

System requirements are the barebones technical essentials your computer needs to work with your Epiphan video grabber. System requirements to use DVI2USB 3.0 are:
Video source
Video capture workstation
Video capture workstation operating system
RAM Minimum recommended value: 4 GB
Available hard disk space 16 GB (32-bit OS) or 20 GB(64-bitOS)
Note that the latest versions of the Epiphan drivers for SDI2USB 3.0 (starting with release 3.30.2) use SHA-2 signing which is not supported on Windows XP or Windows Vista. If you want to use either of those platforms, we recommend using an older driver. Windows 7 and Windows Server 2008 R2 must be up to date to work with drivers signed with SHA-2.
Any VESA-compatible VGA, DVI or HDMI source. (DVI2USB
3.0 cannot capture from HDCP encrypted sources)
Any computer (laptop/desktop/other format) with:
l a compatible USB 3.0 host controller for SuperSpeed
operation (recommended Intel ® USB 3.0 eXtensible Host Controller); or,
l a USB 2.0 controller
Windows 7, Windows 8.1, Windows 10 Mac OS X 10.10 and up A list of precompiled linux drivers (kernel 3.5 or later) is available on the product support page
6
DVI2USB 3.0 User Guide Quick start

Quick start

This section helps you get up and running quickly with your DVI2USB 3.0 on Windows or Mac OSX (for Linux distributions, seeDVI2USB 3.0 on Linux). Using the steps below, you will connect your video grabber tothe video capture workstation and connect the video source then begin to capture video (and optional audio) content!
Before you get started, make sure you have:
l reviewed What's in the Box? to make sure you received all the cables and components
l reviewed the System requirements to make sure your capture workstation meets the requirements
l a video source (i.e. a camera, a computer, a tablet, or a phone). Note the source must not be
HDCPprotected.
l (on Windows only) accompanying audio over the same source cable
l the appropriate cables or adapters to convert the output to DVI (if needed)
l internet access (to download the video grabber drivers from the Epiphan website)
l admin privileges or password for your capture workstation
These instructions describe how to use your DVI2USB 3.0 with the Epiphan Capture Tool.You can also use third party capture applications, but you must at least complete the driver installation.
Install the video grabber drivers:
This step must be completed before connecting the video grabber to your video capture workstation.
1. From your capture workstation, open an internet browser and go to your video grabber's product
support page.
2. Choose the download link that matches your computer's operating system.
Note that for Windows operating systems there are two packages, 64-bit and 32-bit. Make sure you download the correct package. If you don't know which version you need, you can look at this Microsoft knowledge base article for more help https://support.microsoft.com/en-us/kb/827218.
3. When the download is complete, open the download destination folder and find the file.
4. Follow one of the following procedures, depending on yourOS.
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DVI2USB 3.0 User Guide Quick start
5. For Windows:
a. Right-click on the .zip file and choose Extract All (the files must be extracted before
proceeding).
b. Open the extracted files folder.
c. Right-click on setup.exe and select Run as administrator to start the installation.
d. Follow the prompts to install the drivers (the Epiphan Capture Tool is also installed).
Installation may fail for computers inheriting security permissions from a Windows domain, even when the installer is run as administrator. In that case, contact your local IT team for assistance with installation.
6. For Mac:
a. Save your work and exit all other applications. (Note: the workstation will reboot after the driver
installation).
b. If not automatically unpacked to a .pkg file, double-click the .dmg file to unpack it.
c. Double-click the .pkg file to begin the installation.
d. Follow the prompts to install the drivers(the Epiphan CaptureTool is also installed).
e. Enter the admin password, if requested.
f. The workstation needs to be restarted and is ready after restart.
Connect the video grabber and the video source:
Now that the drivers are installed, you're ready to begin capturing! Although the steps below ask you to connect the video source to the grabber, then the grabber to the workstation, you can connect the video source and video grabber in any order.
1. Connect the video source to the DVI-I port on the video grabber. (If necessary, use an adapter or
appropriate converter cable.)
8
DVI2USB 3.0 User Guide Quick start
2. Connect the provided USB 3.0 cable to the bottom of the video grabber.
3. Connect the other end of the USBcable to an available USB port on your video capture workstation
(use a USB3.0 port for best performance).
9
DVI2USB 3.0 User Guide Quick start
If using a splitter cable for your video source, use a high-quality HDMI or DVI splitter to split the signal between an other devices and the video grabber. For VGA signals, use an active VGA splitter rather than a passive VGA splitter (also called a Y-Adapter). This will help maintain a cleaner video signal.
Capture video
If needed, read Epiphan Capture Tool (Windows) or Epiphan Capture Tool (Mac) for information on how to launch the capture tool.
1. Start the Epiphan Capture Tool; your video source is immediately detected (if you see a No Signal
message, disconnect and reconnect the cables to make sure they are all seated correctly).
2. (Windows only) If you want to capture audio from the video grabber, click the Enable Audio button in
the toolbar; it's style changes to show audio is enabled. (If your source doesn't have audio or if you want to use a different audio input method, seclect Capture » Audio Input Device to select your audio source.)
10
DVI2USB 3.0 User Guide Quick start
3. Use the red record button to start recording. On Mac, the recording starts immediately. On Windows,
the Save dialog opens. Specify the filename and folder to save your file.
4. When you are done capturing, use the pause (Windows only) or stop buttons to pause or stop
recording.
5. Use your operating system's file browser (Windows Explorer or Finder) to find your saved capture file.
Windows only:If you're having trouble capturing embedded audio, make sure you have the video grabber connected to a USB 3.0 port. Because of the extra volume of data that needs to be captured, embedded audio capture is only supported when connected via USB3.0.
Windows only: HDMIaudio capture may fail if your device has an old or incorrect EDID loaded. See Update device EDID.
What’s next?
Now that you have done a basic recording, you might like to know more about the following topics:
11
DVI2USB 3.0 User Guide Quick start
l Configure your device
l DirectShow video adjustments (Windows)
l QuickTime video adjustments (Mac)
l Epiphan Capture Tool
Refer to the table of contents for a complete list of the topics covered.
12
DVI2USB 3.0 User Guide DVI2USB 3.0 on Linux

DVI2USB 3.0 on Linux

Epiphan provides drivers and an API for linux, but does not provide a capture application. The video grabber is compatible with Video4Linux, so you can use any Video4Linux application for capture. You can also use the EpiphanLinux SDK to write your own application. For more information see the Epiphan product downloads page for your DVI2USB 3.0. You'll find the Software Development Tools section which contains C and C++api and a java interface and example.
USB device driver (linux)
The Epiphan USB device driver for linux come as a set of pre-compiled binaries and additional source files that you may need to compile before installing on your computer.
To download the drivers for your product, go to www.epiphan.com/support and find the support page for DVI2USB 3.0. From the Downloads tab, select the Linux download link; the linux download page appears.
Choose vga2usb from the first dropdown box, and specify your linux distribution specifics in the other boxes. Once you've drilled into the version of linux for which you want the drivers, click the file links to download a compressed file with everything you'll need to compile and install the driver. Unzip the file and read the README for further instructions.
13
DVI2USB 3.0 User Guide DVI2USB 3.0 on Linux
The driver works with Video4Linux compatible applications (including gStreamer, VLCand the Video4Linux application), and with the Epiphan API.
Epiphan capture API
The Epiphan capture API receives captured images from the USBdevice driver. To record or stream these images you can use a compatible Video4Linux application(such as VLC or gStreamer) or you can use the API to write your own capture application.
TheAPI is optimized for capturing high resolution images from your DVI2USB 3.0. It analyzes individual images, performs on-device cropping and handles video mode changes.
See the product support page to download the Software Development kit, which includes the Epiphan capture API.
Sample applications
Epiphan provides some sample applications including a sample capture application, a sample settings application and a sample utility for reading and writing EDIDs. Source for some of the samples (such as the capture application) is included in the SDK.
You can download the samples from the same downloads page as the driver.
14
DVI2USB 3.0 User Guide Physical attributes

Physical attributes

The DVI2USB 3.0 device measures 90mm x 60mm x 23mm (3.54” x 2.36” x 0.91”). It features a single DVI-I type connector, a USB 3.0 connector and an LED indicator. This small, portable product easily fits in the palm of your hand.
Table 2 Connectors and indicators
Number Interface Description
DVIInput
USB 3.0 Output
LED
Connects a DVI, VGA or HDMI source to the video grabber.
Connects the video grabber to the capture workstation and enables data transfer from the video source to the workstation.
The video grabber works best when connected to a USB 3.0 port on the capture workstation, but is also backward compatible withUSB2.0.
LEDindicator light indicates the current status of the video grabber. See Indicator LED details for the meaning of different light colors.
15
DVI2USB 3.0 User Guide Physical attributes
Epiphan always recommends using a USB 3.0 port for best performance. If a USB 2.0 port is used instead, DVI2USB 3.0 transfers video at a lower frame rate and is unable to capture embedded audio.
16
DVI2USB 3.0 User Guide Indicator LED details

Indicator LED details

The color and action of the indicator LED depends on whether you are connected by USB 3.0 or USB 2.0. For maximum performance, always use a USB 3.0 port and the included USB 3.0 cable. Note that frame capture rate will be reduced when connected via USB 2.0.
If you’re not sure if your controller is USB 3.0 or USB 2.0, plug DVI2USB 3.0 into the capture computer and look at the indicator LED (note that test this assumes there is no video source plugged into the video grabber):
A flashing blue LED means USB 3.0 A flashing green LEDmeans USB 2.0
LED color USB 3.0 connection USB 2.0 connection
The video grabber is powered on but is not functional. The
Solid red
Blinking red
Solid yellow Image/video capture or data transfer is in progress.
Flashing blue
Flashing green
Solid green -
driver is not installed or failed to load. If you installed theEpiphan CaptureTool and drivers, disconnect and reconnect the USB cable.
The video grabber's security validation has failed. Contact Epiphan support with the product serial number and details of your system.
The firmware is loaded successfully, the device is idle.
Video mode detection is in progress.
The firmware is loaded successfully, the device is idle.
Video mode detection is in progress.
-
17
DVI2USB 3.0 User Guide Troubleshoot

Troubleshoot

If you're experiencing problems with your DVI2USB 3.0, use the following tips to attempt to rectify the problem.
If using splitters, be sure to always use high quality splitters. For VGA splitters, use an active VGAsplitter rather than a passive or Y-Adapter splitter.
Capture device not found:
If the Epiphan Capture Tool does not find the video grabber, the message Capture device not found is displayed in the capture application.
Try the following troubleshooting tips:
l Confirm that the video grabber is connected to the capture workstation's USB port. The device's LED is
lit when it is connected.
l Disconnect and reconnect the video grabber from the USB port. This allows the operating system to
load drivers for the video grabber, if they haven't already been loaded.
l Check the indicator LED colors and compare to the list described in Indicator LED details.
l On Windows, check the Windows Device Manager to verify that you can see the video grabber in the list
of devices.
l If trying the above suggestions does not resolve the issue, close all applications and restart your video
capture workstation.
18
DVI2USB 3.0 User Guide Troubleshoot
No signal detected:
Try the following troubleshooting tips:
l Confirm that the video grabber used by the application is the correct one. Compare the serial number
in the window frame (300292 in the example above) with the serial number sticker on the back of your device. If they do not match, use the Capture » Select device... (Windows) or the device list(Mac) menu item to select a different video grabber.
l Confirm that your video source is on and is outputting data to the video cable connected to the video
grabber(this may be a hardware or software setting in your video source).
l Disconnect and reconnect the video source from the video grabber.
l Check the indicator LED colors and compare to the list described in Indicator LED details.
19
DVI2USB 3.0 User Guide Configure your device

Configure your device

Epiphan lets you fine tune image adjustments and select a VGAmode (for analog sources) and control how your video grabber works with DirectShow (Windows) or QuickTime (Mac) compatible applications.
The menu options that appear in the Configure dialog vary depending on the kind of source you have connected to the video grabber. Some menu items are only applicable to VGAsources and therefore only appear when a VGA source is connected.

Windows

To access the configuration screen on Windows, do one of the following:
1. From the Epiphan Capture, choose Capture » Configure Device... or
2. Open the Windows ControlPanel.
a. Click the Epiphan Frame Grabbers applet; the Epiphan Frame Grabber Configuration window
appears.
b. Select the grabber you wish to configure.
c. Click Edit Configuration; the edit configuration window opens.
Mac
To access the configuration screen on a Mac, do one of the following:
1. From the Epiphan Capture Tool, choose View » Show Adjustment Controls or
2. Open the Systems Preferences panel.
a. Click the Epiphan icon, the Epiphan preferences window appears.
b. Select the Capture tab.
c. Choose the video grabber you want to configure(necessary only if you have more than one
video grabber).
d. Click Edit; the configuration window appears.
20
DVI2USB 3.0 User Guide DirectShow video adjustments (Windows)

DirectShow video adjustments (Windows)

in the Epiphan Capture Tool, the Capture » Configure Video » DirectShow page lets you configure how the device interacts with DirectShow compatible applications. From the resolution to whether or not the image is flipped, there are a variety of options available. See the table below for an explanation of each option.
On Windows, you can also access this screen using the Epiphan applet in the ControlPanel by selecting the video grabber you'd like to configure and clicking Configure Device or Default Configuration.
The adjustments made here are stored in the device driver and are used until you change them again. Once applied, you do not need to keep the Epiphan Capture Tool open to use the values you set. Be aware that third party DirectShow compatible applications can also have settings that may make it appear your settings are not being honored. If you're having difficulty seeing your changes, check the third party application's advanced settings.
Item Description
Use this checkbox to force the resolution your video grabber reports to DirectShow compatible applications.When checked, the drop down box has a list of resolutions from which you pick your desired resolution.
Fix resolution
If you choose a resolution that is smaller or larger than the source video, theEpiphan drivers will scale the image for you (unless you uncheck Scale image to match stream resolution, in which case the image will be cropped to match your chosen resolution).
21
DVI2USB 3.0 User Guide DirectShow video adjustments (Windows)
Item Description
Select an image to display when there is no signal captured from your
Default image
video grabber. The uncompressed BMPimage must be located on your video capture workstation.
If you are using a fixed resolution and choose not to scale the image, the captured image will appear cropped to your specified resolution when capturing with a DirectShow compatible utility. Generally the cropping happens at the top left corner of the video, but test first to be sure you see the same results.
Scale image to match stream resolution
Flip image vertically
Limit frame rate to
Normally, when choosing to use a fixed resolution with DirectShow, you'll want the Epiphan drivers to scale the image for you. Use the slider to determine the type of scaling you'd like. Scaling performance is a tradeoff between quality and CPU cycles on the capture computer. Lower quality (left side of the slider) is faster and takes fewer CPU cycles, where higher quality(right side of the slider)is slower and takes more CPU time. Try different values out to find the one that works for your specific use case.
Use this check box to flip your captured image vertically when sending over DirectShow.
Use this to limit (or fix)the frame rate for the data you send to DirectShow.
For example, if you're using a DirectShow-compatible application like WebEx and you're sharing something relatively static(like a PowerPoint presentation), you could limit the frame rate to 5 fps, which would be plenty for people watching at the other end, and would avoid filling your data pipe with identical images.
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DVI2USB 3.0 User Guide QuickTime video adjustments (Mac)

QuickTime video adjustments (Mac)

The adjustments made here are stored in the device driver and are used until you change them again. Be aware that third party QuickTime compatible applications can also have settings that may make it appear your settings are not being honored. If you're having difficulty seeing your changes, check the third party application's advanced settings.
After changing QuickTime settings you may need to quit and restart your QuickTime compatible application to force it to read the updated settings.
Item Description
Choose from Actual, Default or Fixed.
With Actual, the captured source resolution is sent to QuickTime. If at any time during a recording session no signal is detected, an error will occur that could interrupt the recording session.
Video Resolution
With Default, the specified resolution is sent only when there is no signal on the video grabber. If the reported resolution doesn't match the actual frame size, frames are resized.
With Fixed, you can choose the resolution you want to send to QuickTime, regardless of what is coming in through the video grabber. The video will be scaled (up or down) to match the specified resolution.
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