[ogg-dev] Screencasting using Ogg

Silvia Pfeiffer silvia at silvia-pfeiffer.de
Sat Mar 27 16:01:07 PDT 2010

I would suggest installing some little program that makes on-screen
displays of the ATK events. For example similar to growl on the Mac -
I'm pretty sure there are applications that do that. Then, you can use
any screen recorder to record the screen with these little displays.
You can use Istanbul to directly encode into Theora:
http://live.gnome.org/Istanbul .

That would be the easiest way to save this problem. But if you really
wanted to implement support for the ATK events, I would suggest adding
it to Istanbul. Have a chat with their developers to see if that is a
feature they would be keen on. Then store the ATK events in a Kate
track of the Ogg file.


On Fri, Mar 26, 2010 at 9:27 AM, Greg Lowe <greg at vis.net.nz> wrote:
> Here's what I'd like to be able to do...
> Record my screen to an ogv:
>   - Record screen and encode in real-time using a light-weight encoder
> settings (in order to keep CPU usage low while recording).
>   - Store ATK events (i.e. key presses, and menu clicks) as they occur as
> meta-data within the ogg.
> After the recording is finished:
>   - Post-process ATK meta-data to add overlays for highlighting mouse
> clicks, and callouts containing text such as "File -> Open". The overlays
> should be stored within the ogg.
>   - Re-encode ogv using high-compression encoder settings, to get a smaller
> file size suitable for distributing over the web.
> I'd like to encode the screen captures using a lossless compression format,
> such as zlib or PNG, to avoid compression artifacts around hard edges.
> Would it be possible do do this using ogg and existing codecs?
> (In case I'm being confusing, I am aware that there's no existing software
> that achieves this process, I'm considering writing that myself. My question
> is specifically whether the ogg container format and existing ogg codecs are
> able to achieve this).
> Some ogg codecs that could be potentially be used:
>       http://wiki.xiph.org/Kate
>       http://wiki.xiph.org/OggMNG
>       http://wiki.xiph.org/OggSpots
> Some examples of some proprietary screen codecs:
>       http://wiki.multimedia.cx/index.php?title=VMware_Video
>       http://wiki.multimedia.cx/index.php?title=Flash_screen_video
> Cheers,
> Greg.
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