Re: Suggest to remove "videorate" and "videoscale" filters from the video_save_bin

[Filippo Argiolas <fargiolas gnome org>]

On Tue, Oct 20, 2009 at 10:26 AM, Bin Gao <bin gao intel com> wrote:
> Hi all,
>
> I recently found when cheese was recording video from a webcam at
> 640x480 resolution on a netbook (e.g. Asus EeePC 901), the CPU occupancy
> was up to 100% and system response was very slow. The theora and vorbis
> encoder are expensive on Atom processor. But I found the two filters
> video_save_rate and video_save_scale in the video_save_bin pipeline seem
> useless, so I removed them and then I got the CPU occupancy down to ~80%
> (20% off) and the system response became normal.

The videorate element is needed because oggmux needs a perfect stream.
See http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-videorate.html
and https://bugzilla.gnome.org/show_bug.cgi?id=542014
Removing it video and audio in the recorded video go out of sync after
a couple of seconds.

I cannot figure out why a videoscale element was added in the save
bin, it's needed in the display bin with ximagesink but I don't really
know its purpose in the encoding pipeline.
I suppose there was a reason for it, Daniel? Jaap?

Regards,
Filippo Argiolas