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you can use virtualdubmod which is free:
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1. PREPARE YOUR WATERMARK IMAGE
a) If making a text watermark:
Open up your favourite image manipulation/creation program. Create a new image – I’d suggest a canvas size of 200 (width) x 20 (height) as a good starting point, but you can use whatever you like, just bear in mind how it will look and fit on the screen. Use your image software to paint the background black. Now create the text you wish to appear in the watermark, and place it on the black background, making sure that the text colour is white. Once finished creating your watermark image, save it, but make sure that you save it as either a .BMP or a .TGA file.
b) If you are using an existing image:
Simply open the image, and make sure you save it as a BMP or TGA file.
Please note:
It is imperative that you save your watermark as either a .BMP or a .TGA file, as these are the only file formats virtualdubmod will accept for watermarks.
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2. SET UP VIRTUALDUBMOD
Open Virtualdubmod, go to File > open video file
Select your source video and press the Open button.
Go to Video > Filters
Click the Add button, scroll down to the logo filter
Click OK.
Press the … button to the right of the Logo image field and select your watermark image.
Tick the enable per-pixel alpha blending using alpha channel tickbox.
Leave the Use premultiplied alpha tickbox ticked.
Tick the use gray channel of secondary image for alpha channel tickbox.
Press the … button to the right of the Alpha image field and select your watermark image.
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I did copy/paste from another forum
batch movies - I'm 99% sure that you can do that too with virtualdubmod but you'll have to figure that one yourself, look for jobs somewhere on the menu or sometibng similar
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