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--- visual3d:documentation:dialogs:processing_video_in_visual3d [2024/07/16 17:02] – removed sgranger
+++ visual3d:documentation:dialogs:processing_video_in_visual3d [2024/07/17 15:45] (current) – created sgranger
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+====== Processing Video in Visual3D ======
+Visual3D does not process Video data. For example, it is not possible to identify locations manually by digitizing a series of Video images. Visual3D expects to receive data in the format of 3D points, ANALOG data, or 6 Degree of Freedom segments.
+We are receiving an overwhelming number of requests for simple processing of Video images, so we are currently evaluating the idea.
+We can certainly see the value in having simple 2D digitizing and analysis for use in teaching because this allows students to become acquainted with Visual3D before working in a laboratory. We welcome input from the community in identifying the basic requirements and cost of such an addition to Visual3D.
+==== Playing Synchronized Video and MoCap animation ====
+**Visual3D will automatically play Motion Capture data and synchronized video.\\
+For example, download a [[https://www.has-motion.com/download/examples/ExampleVideo1.c3d|ExampleVideo1.c3d]] and synchronized video file [[https://www.has-motion.com/download/examples/ExampleVideo1.avi|ExampleVideo1.avi]]\\
+You can load the AVI file two ways:** (both methods are described below)
+  - File-> Open and selecting both files
+  - File -> Add/Modify Synchronized Video Files
+=== Using File-> Open ===
+|**(A)** Launch Visual3D and open both files  |  {{:videoExample1_1.gif}}|
+|**(B)** Switch to **Signal and Event Processing Mode.** and make the **ExampleVideo1.c3d** file active by selecting in the pulldown menu. You should see a Video View and the Motion Capture View. Playing the motion capture data should synchronize with the Video image. If you do not see the video, make sure that **View Synchronized Video** is selected in the View menu.  |  {{:videoExample1_2.gif}}|
+=== Using Add/Modify Synchronized Video Files ===
+**(A)** Load the C3D files into Visual3D.
+**(B)** Go to File -> Add/Modify Synchronized Video Files
+**(B) 1.** In the dialog that appears, select the relevant C3D file. Then click "Associate Video File with Selected Motion File" and browse to the desired avi file.
+=== Changing Video size ===
+The size of the video window can change by clicking on one of these buttons: "25%", "50%", "100%", "200%", or enter in a custom value.
+==== Export 3D Viewer Animation to AVI ====
+Visual3D can create/export video of the 3D viewer animation. To do export/create an AVI video file of the 3D viewer animation select **Export** from the **File** menu. Then select **Export Animation to AVI**. A dialog box will appear that will allow you to select the range of frames, frame rate, and size of the video.
+== Stuttering playback of avi files ==
+A user identified an issue that we will use as an illustration of video export settings.
+Question: When exporting/creating an AVI of an animation (target data captured @ 100 Hz) with the following settings, we get a stuttering playback (stops, starts, skips quite a few frames). Similar issues are seen at other Frame rates / output sizes. Is this a codec issue or a Visual3D software issue?
+{{:ExportAviDlg.gif}}\\
+Answer: At 50 frames/second the AVI file is probably very large. The problem is usually with reading the file from the hard drive fast enough to animate it. Try 25 frames/second and see if that works any better (25 fps is close to the PAL format of 24fps). For just playing video, 25fps should be sufficient.
+If you have any other software to convert video, you can also take the output AVI file and convert it to a compressed format, such as mpg, or windows media format.