Adding Logos And Graphics To NSV Video
Page 1 of 2
Written by ken52787
Edited by Sankt
Adding Graphics To NSV Files Part Two

This guide will explain how you can use Avisynth to create overlays and other video processing. These methods will allow you to transfer graphics straight from the source files to NSV without the need to create any temporary video files.

You need to get Avisynth. You can download it from
www.avisynth.org. The overlay part of the guide also requires Adobe Photoshop. Other image editing software may be compatible.

This guide also assumes you have a good understanding of video files and terms like resolution, framerate, etc.

If you are going to use Divx or Xvid video, you need to get the latest Divx codec from
www.divx.com. Install the software, then go into the Decoder Configuration Utility. Under the quality settings tab, make sure "Support Generic Mpeg-4" is selected. It also is a good idea to select "Disable logo" because that will show up in your encodings.

Resizing and changing framerate.

Open notepad and then save the file. Make sure the "Save as type" is set to All Files, then call it "example.avs". This will be our script file.

Open a video file by typing the following line, substituting in your video's path :

DirectShowSource ("C:\path\to\video.avi")

Save the file again and open it in Windows Media Player (you will have to set the File Types to all to select it). If all went well, it should start playing your video.

Now resize this video using a Bilinear filter to avoid jaggies.

In your notepad, add this to your line :

DirectShowSource ("C:\path\to\video.avi").BilinearResize(320,240)

Now watch the file again and it should have been resized to 320 x 240.

You also might want to change the framerate of the video so that you can get a more efficiently compressed video when you encode it to NSV.

You can do that by adding a new line to your script, with this in it :

ChangeFPS(15)

This will convert the framerate to 15fps.

You can visit
www.avisynth.org for a whole list of other filters you can apply, but one more that I will share that I like to use is the Temporal Softener. It will help get rid of noise, which can be hell on encoding.


You can apply it using :

TemporalSoften (4,4,8,15,2)

Overlaying a station watermark

Here's where things start getting a little tricky. First off, this is when we start dealing with several sources (the video and the images for the overlay) so we need to start naming the sources. We do that by a simple "name = ".

The loading of the video in our script now becomes :

video = DirectShowSource("C:\path\to\video.avi").BilinearResize(320,240)

Make the image to overlay.

You need to launch Photoshop (or similar image editing software.). Start by creating an image with the size of your planned video output (ie. 320x240). This allows for easy positioning as you can do it right in Photoshop. Make sure the background is transparent. Now create a logo, for my example, I'll use a simple shape with a spray behind it. You can make it as complex as you want. This guide will allow you to have transparences (even partial transparencies) in your image, so go all out.
 

Example image :

Now add a new layer, and drag it all the way to the bottom of the layer list. Make sure that layer is highlighted, then use the paintcan to fill the entire layer in with black. Its ok if you can't see the black parts of your logo anymore, they will show up in the video.

Example image :


Adding Graphics To NSV Files Part Two

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