Video Analysis Software by AllSportSystems

AVI video is frozen or black.

admin — Mon, 22 Sep 2008 15:54:42 +0000

Some of our customers have reported being unable to play .AVI files captured within our software. The symptom is that they see the first frame of video only, but nothing happens when they play the video, or attempt to move the video into a different position. In some cases the video image turns black… in other cases nothing happens at all, the video stays at the first frame.

In every case where this has happened, the problem has proven to be some third-party video codec that is running in place of the standard Microsoft DV codec on their system. This problem has been resolved in every case by identifying and removing the third-party video codec or software package.

Video packages that are known to cause this problem include:

Windows Essential Media Codec pack 1.0
Videowave 10
K-Lite Video Codec Pack

There are many freeware “video codec packs” available by download that may corrupt your computers ability to play AVI files in our software (the list above is not all inclusive). If you are experiencing this problem you will most likely need to uninstall third party video codec packs or software video players from your system. This problem can be difficult to resolve due to the sheer quantity of such products available for download, so you may need to uninstall more than one product before finding the culprit.

How do I measure bowling ball RPMs in MotionView?

admin — Wed, 23 Jul 2008 15:31:12 +0000

After taping the ball, record the shot from a position where you can see the ball rolling down the lane
On the Analyze screen, advance the video to a point where the tape is horizontal, or as close to horizontal as you can get.
Press the RPMs button. You will be instructed to “draw a line” through the bottom portion of the tape.
After drawing the line, you will be instructed to “advance the video through one complete revolution of the ball.
After advancing the video draw a second line through the top portion of the tape.
The RPMs will be displayed at the bottom of the screen.

Why can’t I draw on the right side video?

admin — Wed, 23 Jul 2008 13:11:36 +0000

In split-screen mode, the drawing tools will work on both the left and right videos only if they are the same dimensions. Both videos must match in terms of their resolution (720×480, or 640×480, etc). If the two video files are not the same resolution then the drawing tools will work only on the left video.

NOTE: MotionView 7.2 and above removes the above limitation and permits drawings on all videos, regardless of their dimensions.

How do I combine video clips from multiple games?

admin — Tue, 15 Jul 2008 12:00:20 +0000

To combine multiple data files in MotionClip use the following procedure:

1) Open the first data file/game film set as usual
2) Use “Insert a data file into this session” under the file menu to choose additional data files/video sets.

Please note that this will add the tagged plays and the video files into the first data file. We recommend that you use “Save as…” and name the resulting combined data set something different. This way you can continue to add new data sets without messing up your initial file.

As an example, let’s say that you have three individual game films tagged, with data files named “game1.csv”, “game2.csv”, and “game3.csv”. You could open game1.csv, and then save it as “2008season.csv”. Next, insert game2.csv and game3.csv. Now, you still have each individual game as well as one large data file that covers all three games.

Using the Scissors (trim function) in MotionView

admin — Mon, 05 May 2008 18:29:10 +0000

The scissors buttons allow you to trim the contents of one or optionally two video files. After the trimming is complete the video file(s) will contain only the contents that were selected using the BEGIN and END function. Be very careful when trimming video files, since this cannot be undone! Here’s how to use the scissors:

Position the left video to the beginning point of the action you wish to ‘keep’. If you are working in Split Screen mode and intend to trim both videos simultaneously then position the RIGHT video to the beginning point as well.
Press the BEGIN button to identify the starting point from which to trim.
Position the left (and optionally the right) video to the end point and press END.

Once you’ve identified a range of video you may use the LEFT scissors icon to trim the left file, or the RIGHT scissors icon to trim the right file, or the DOUBLE SCISSORS icon to trim both files.

What is the relationship between Shutter Speed and Frame Rate or Frames Per Second?

admin — Fri, 18 Apr 2008 14:17:05 +0000

Most consumer cameras in the U.S. take 30 pictures every second. This is a constant, and is known as the Frame Rate or Frames Per Second. The amount of time the shutter is open during each of these pictures is determined by your shutter speed. So if you set your shutter speed to 1/100th of a second, then during each of those 30 images the camera will capture 1/100th of a second worth of action. If you set the shutter to 1/10000 then each image will capture only 1/10000 of a second. The camera will not take ‘the next’ picture until 1/30th of a second has elapsed. Therefore, a faster shutter speed will reduce the amount of blurring you see in high speed actions, but it will not increase the total number of images captured during any period of time. The following image illustrates this for a camera filming 30 frames per second, with the shutter speed set to 1/100th of a second.

Can I use the white space at the bottom of the screen when I have 2 videos open?

admin — Fri, 18 Apr 2008 13:23:21 +0000

Yes you can! Notice the small grey bar that shows up underneath your videos when you have two files open. Click your mouse anywhere inside that grey bar underneath the left video, and you will find that the RIGHT video will ’slide over’ to that position. Use this feature to position the right hand video as far over on top of the left as you can, without overlapping the athlete in the left video.

Now you can ZOOM out (use the + key) and you will find that both videos can make fuller use of the available screen space.

What are the typical sizes for AVI or WMV video files?

admin — Thu, 17 Apr 2008 13:57:55 +0000

AVI video generally consumes about to 4 to 5MB per second (at 720×480 resolution). You will want to use AVI in MotionView because this produces the highest quality and because AVI files produce the smoothest playback in forward and reverse slow motion.

Windows Media (WMV) videos typically consume about 10 MB per MINUTE at 640×480. This is the format you will want to use in MotionClip, since you will be working with much longer video segments (matches or games), and probably not doing much slow motion analysis.

Can MotionView accept data from high speed digital cameras?

admin — Thu, 17 Apr 2008 13:49:58 +0000

Yes it can! We have customers with cameras that shoot 1,000 frames per second using MotionView to analyze the video. These cameras store the footage internally during capture, so the video is first transferred to the computer outside of MotionView, where it can then be opened and analyzed.

How do I convert video to 60 frames per second (FPS)?

admin — Thu, 17 Apr 2008 13:42:24 +0000

Conversion to 60FPS takes place on the “Export Video Options” panel. To convert a video file from 30FPS to 60FPS take the following steps:

. Open the 30FPS video in MotionView, and trim any excess.
. Click the Export Video icon.
. On the Export Video Options panel select “Convert raw video into 60FPS”.
. Click OK and choose a filename for your new video.

This will produce a new video file in 60FPS. Your 30 FPS video will not be affected. Note that 60FPS conversion only works on video files that are “interlaced”, such as AVI files that were captured over firewire or over our USB Video Capture cable. You cannot convert WMV, MOV, MPEG, or other formats into 60FPS.