[Bug 725051] New: x264enc: allow lossless compression (qp=0)

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725051
  GStreamer | gst-plugins-ugly | git

           Summary: x264enc: allow lossless compression (qp=0)
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-ugly
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vhdirk at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=270105)
 View: https://bugzilla.gnome.org/attachment.cgi?id=270105
 Review: https://bugzilla.gnome.org/review?bug=725051&attachment=270105

Proposed patch

As described on the ffmpeg x264 encoding guide [1], lossless compression in
h264 is possible by setting qp to zero in constant quantizer mode.

With x264enc, this is not possible since the properties 'quantizer', 'qp-min',
'qp-max', and 'qp-step' cannot be set to zero.

This patch addresses this by changing the minimum value from 1 to 0.

[1]: http://trac.ffmpeg.org/wiki/x264EncodingGuide#LosslessH.264

-- 
Configure bugmail: https://bugzilla.gnome.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the QA contact for the bug.
You are the assignee for the bug.