[linux-dvb] Re: VIDEO_STILLPICTURE - success

[Dave Chapman <dave@dchapman.com>]

Marcus,

I needed to update the DVB driver to the very latest CVS, and then it works 
as described in the API docs.  With my previous driver (about 1-2 weeks old), 
I just got a blank screen - thanks for the help you gave me off-list.

I've managed to display various images at the size you suggest using the 
following imagemagick command:

"convert -sample 702x576\! testimage.ext test.mpg"

I've written a short program that grabs a JPEG image every 10 seconds from a 
webcam on the Internet, and displays the picture using the DVB card.  This 
has been running for the last hour without problems - if anyone wants a copy, 
please email me privately.  

I've also done some quick benchmarking if anyone's interested:

1) displaying the same image repeatedly 100 times takes 31 seconds - i.e. it 
seems to take the driver/card about 1/3 of a second to display a frame.

2) converting a single frame from a 320x200 JPEG to 702x576 I-FRAME takes 3.5 
seconds on my PII 400MHz system using imagemagick.

Regards,

Dave.

On Thursday 28 June 2001  2:48 pm, Marcus O.C. Metzler wrote:
> You could use convert (part of the imagemagick package) to convert
> jpgs or other formats into mpg. They also use mpg2enc, but you don't
> need to write your own config file. I have tried it with some images,
> but it doesn't work with all of them. With have to see what we need to
> fix in the driver. You will also have to use images with supported
> resolutions, or use the -size option of convert.
> It works if I create a jpg with gimp (size 702x576) and use
> convert test.jpg test.mpg
>
>
> Marcus


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