FFDShow Video Overlay
Submitted by : Toqer  Slavas  HHB
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ffdshow is an open source DirectShow and VFW codec for decoding/encoding many video and audio formats, including DivX and XviD movies using libavcodec, xvid and other open source libraries with a rich set of postprocessing filters. It can also be used to imprint graphic overlays onto NSV video streams.

Download ffdshow
www.free-codecs.com

Configuring ffdshow

If everything is installed correctly your start menu should have these things under Start> All  Programs> ffdshow.



You want to select the bottom one - Video Decoder Configuration.

When you open ffdshow, a large window opens.

The first place you want to visit is the codecs section. You can pretty much tell everything to use libavcodec, but for this guide, we are going to select DVSD.



Next go to the tray section, make sure show tray icon is checked.
(This will let you know that ffdshow is working when you launch NSVenc. )



This is how I have the overlay section setup.

This is the bitmap overlay section



(You can make adjustments once NSVenc is running.)

Next, run NSVenc.

Once NSVenc is running, and you're capturing from your DVSD source, you will notice a little ffdshow icon in your system tray.



Double clicking the ffdshow icon will bring up the ffdshow dialog.

In the dialog box, you can tweak ffdshow configurations on a live stream.

You can add filters, change picture properties, psuedo zoom (digital) change overlays and other things.

The bitmap overlays that I have used are bitmaps, not jpg,png,gif,etc.

Black is a transparent color, if you use the lighten mode.


Additional notes:

Enabling settings per application is useful if ffdshow is used for more that for streaming.



Additional ffdshow features.

ffdshow allows you to include screen announcements overlaid on the live broadcast screen. In the same way you made your logo bitmap for logo overlay, you can make announcement bitmaps.

ffdshow lets you save a profile for each one -- load the announcement bitmap for overlay, you'll see it appear on the live screen. Then go to the "image settings" part of ffdshow config and save it as a profile to use whenever you want to overlay the announcement. You can make as many different bitmap profiles as you need.

Overlaying a profiled announcement live is simply a matter of loading the profile for it -- takes about 5 to 10 seconds to appear on the live screen, but the time delay is an unavoidable result of encoding to a remote Shoutcast server.

In addition, outdoor live broadcast tests have presented a variety of environments -- bright sun, overcast, and so on. With ffdshow as helper, you can correct the image appearance in real time to suit the situation. You can also save the adjustments in a profile to use later in a similar situation.

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