I've done a little research, and this is more complicated than I
thought. First of all, all codecs are supposed to be shipping with their
own presets:

> We define 3 quality level profiles, Quality Low,Quality Normal and
Quality High. All codecs should define this.

http://gstreamer.freedesktop.org/wiki/PresetDesign

Even so, it looks like transmageddon is the default home for all of
these profiles. The PresetDesign page has a few presets that are
"canonical" that mirror those in transmageddon That means in order to
get the best use of your gstreamer codecs on Ubuntu, you have to install
transmageddon, which is counterintuitive and obscure.

Secondly, speed=7 doesn't even look like a valid value

> The "speed" property
> 
>   "speed"                    gint                  : Read / Write
> 
> Speed.
> 
> Allowed values: [0,2]
> 
> Default value: 0

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-
bad-plugins/html/gst-plugins-bad-plugins-vp8enc.html#GstVP8Enc--speed

But if you look at the documentation from google, the values allowed for
--rt (realtime) are [0-15].

http://www.webmproject.org/tools/encoder-parameters/#2-encode-quality-
vs-speed

Based on what fourdollars said, 7 is probably an allowed value, just the
gstreamer documentation is wrong.

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https://bugs.launchpad.net/bugs/981803

Title:
  720P video lagging, massive framedrops and out of sync

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