Re: [Vnc2swf-users] Shrinking a vnc2flv file

[Josh H. <the...@gm...>]

On Wed, Nov 4, 2009 at 6:13 PM, Brian Candler <B.C...@po...> wrote:

>
> If you want to have a look at my flv, I'm happy to send it to you
> privately.
> It's Firefox using a web application, with a plain white background, some
> plain colour higlighting, and little motion.
>

Sure, I'll take a look and see if anything jumps out at me.

I did also try x11vnc -scale 1/2, which combined with suitable clipping
> settings on flvrec does seem to give a slightly lower data rate. But it
> would be nice to keep the full-res capture and then scale it down
> afterwards.
>

I haven't tried that, but if it does nearest neighbor sampling (as opposed
to something that would include anti-aliasing) it should give a smaller size
(but I wouldn't expect a huge savings).  Once you've encoded an image,
adding some more areas that use the same colors and repeat the same patterns
doesn't cost much.

What I did at a previous job was record whole screens (2560 x 1024) at full
resolution (8-bit color, 4fps) and then just use a flv player to scale the
video down during playback.  At the time, I wasn't concerned too much about
file size, so I did little else to optimize it.

While it may not be of much general use, I can also note that for archiving
large recordings, running gzip on a raw vnc log results in incredibly small
files (even compared to the .flv's).  Playback is a bit less convenient as
you'd have to uncompress and convert to flv before viewing.

-- 
http://theamigo.blogspot.com