[Bug 756636] New: nvenc: Avoid extra bitstream buffers allocation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756636

            Bug ID: 756636
           Summary: nvenc: Avoid extra bitstream buffers allocation
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: polezhaiev at ukr.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Bitstream buffers allocation is very expensive operation. We shouldn't use 32 /
48, as this gives us no performance boost but makes initialisation take 2
seconds of whole CPU / memory bus, adds unacceptable latency and other
operations should wait.
For shorter videos this makes nvh264enc less performant than x264enc.

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