[MEncoder-users] bmovl

[jay.r]

Hi Chris

I needed something like that for placing a logo or something else in  
the right bottom corner a couple of days ago.
I tried working with bmovl but the results were very bad.. (slow +  
movie was fucked up totally, mirrored parts, etc)
you also haven't got many options, and the documentation of that  
function is really crappy...
So I started to look around and found that there was a -vhook  
function in ffmpeg, where you can use watermarking..
I first encode my movie with mencoder and then I use ffmpeg for  
compressing it + placing the logo..
this is what I use as a command:
$exec = "/usr/local/bin/ffmpeg -i {$this->outputfile}.flv -vcodec flv  
-b 200 -ar 22050 -vhook '/usr/local/lib/vhook/watermark.so -f /home/ 
jayr/public_html/images/logo.gif' -ab 48 {$this->outputfile}1.flv";
an example of the logo can you find here: http://engene.se/ 
ffmpeg_watermark.gif
Make sure that the gif image is the size of your movie (resize it if  
necessary with mencoder.. -of:scale.. 	)
The background of the gif image needs to be gray, if you want it to  
be transparant ( use the color value of the background in the url  
here above )
Try it with a black or white text and see the results.. you may need  
to adjust the gif a couple of times to get the right results..
Don't waste your time on that bmovl function.. that 's the only  
advice I can give you ;)

Regards
Jay



On Jun 29, 2006, at 4:32 PM, Chris Reynolds wrote:

> Ok, so far so good everything I need to do is working
> out. so I only have one more thing I want to do to my
> video clip and that is to use an overlay to mask off
> certain edges.
>
> I've been reading about bmovl but I'm having a really
> hard time understanding how I'm supposed to use it. I
> have a black and white bitmap image that I created and
> want to use as the mask. Is there anyone that can give
> me an example of the code to overlay that onto the
> video and mask off the left and right edges of the
> frame?
>
> chris
>
> PS. I really appreciate all the help I've gotten
>
> Chris Reynolds
>
> http://builderofstuff.com
>
> "Computers are like air conditioners - They can't do their job  
> properly if you open windows."
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