[Elphel-support] question on streaming

[Sebastian Pichelhofer]

On Tue, Jun 12, 2012 at 4:50 PM, flavio soares <qazav3.0 at gmail.com> wrote:
> Hi, a quick question. I was wondering if there is a way of either:
>
> - make elphel's streaming server output the stream at a fraction of its
> original FPS, say 1/2 of it; or

This feature was planned but never implemented if I remember correctly.

>
> - make elphel's streaming server output the stream at a fraction of its
> original resolution, say 1/2 or 1/4 of it; or

no

>
> - make gstreamer play the live stream at half of the original FPS, say 1/2
> of it.

That should be possible. Check the "framerate=25/1" parameter

http://code.google.com/p/gst-plugins-elphel/
has some examples how to show stream at reduced resolution.

Regards Sebastian

>
> I ask this because making Elphel's stream output at 1/2 of the original FPS
> or 1/2 resolution would (in theory) demand less CPU power for the streaming
> and leave more for recording at the camera. With gstreamer, the case is
> similar but on the other side - it would demand less CPU to debayer and
> display the RAW stream live.
>
> (I am using a gstreamer live preview of 1/4 the stream original size and my
> laptop's CPU, a 2005 Pentium M, can handle it fine actually. Even though, of
> course, it would be very nice to save power and use less resourses. Based on
> the tests I put on the article, the jitter starts to happen at frame sizes
> between 350~450k).
>
> thanks!
>
> flavio
>
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