[gstreamer-bugs] [Bug 621663] x264enc: support changing bitrate property on the fly

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=621663
  GStreamer | gst-plugins-ugly | git

Jason Garrett-Glaser <darkshikari> changed:

           What    |Removed                     |Added
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                 CC|                            |darkshikari at gmail.com

--- Comment #4 from Jason Garrett-Glaser <darkshikari at gmail.com> 2010-08-10 22:55:17 UTC ---
Specifically, x264 lets you do one of three things:

1.  In CBR mode, you can change the bitrate.  You cannot go out of CBR mode if
you started there.  Thus, you must change maxrate and bitrate together, keeping
them equal.  You probably want to change bufsize too, depending on the
application.

2.  In CRF mode, you can change the CRF.

3.  In any mode with VBV active, you can change the maxrate and bufsize. 
However, if you started in CBR (per 1), you must stay in CBR.

In short, you can modify CRF, maxrate, and bufsize arbitrarily, but you cannot
change ratecontrol modes (where the available modes are CBR, ABR, and CRF).

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