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--- visual3d:documentation:dialogs:video [2024/06/19 12:47] – sgranger
+++ visual3d:documentation:dialogs:video [2024/07/12 13:28] (current) – removed sgranger
@@ Line 1: / Line 1: @@
-{{{{{{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.
-}}}}}}