[gstreamer-bugs] [Bug 632861] [x264enc] really bad quality with tune=zerolatency

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=632861
  GStreamer | gst-plugins-ugly | git

--- Comment #4 from Robert Swain <robert.swain at gmail.com> 2010-10-22 10:14:43 UTC ---
Created an attachment (id=172990)
 View: https://bugzilla.gnome.org/attachment.cgi?id=172990
 Review: https://bugzilla.gnome.org/review?bug=632861&attachment=172990

x264enc: Work around a rate control issue in libx264

    When variable framerate is disabled in libx264 (which occurs when using
    the zerolatency tuning), libx264 ignores timestamps but still uses the
    timebase leading to messed up rate control with our nanosecond timebase.

    We work around this issue by setting the timebase to the reciprocal of
    the framerate and we validate that the framerate is suitable.

    This has been fixed upstream in libx264 but there are non-fixed versions
    in the wild so this workaround is still needed.

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