[gstreamer-bugs] [Bug 630303] New: theoraenc: Make the bitrate/quality dynamically modifiable

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=630303
  GStreamer | gst-plugins-base | unspecified

           Summary: theoraenc: Make the bitrate/quality dynamically
                    modifiable
    Classification: Desktop
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: tester at tester.ca
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Theora allows changing the bitrate dynamically, here is a patch that implements
that
in the GStreamer element. Here is a patch to do it.

Also, here is a small test case, I'm too lazy to write a real unit tests..

import gst

a = gst.parse_launch("videotestsrc is-live=1 ! video/x-raw-yuv, width=640,
height=480, framerate=(fraction)30/1 ! theoraenc name=enc bitrate=50  ! 
appsink name=sink max-buffers=1")

enc = a.get_by_name("enc")
s = a.get_by_name("sink")

a.set_state(gst.STATE_PLAYING)

last = None
avg = None
for i in range(1, 600):
    if i != 0 and i % 60 == 0:
        enc.set_property("bitrate", i)
        avg = None
        print "SET TO ", i
    buf = s.emit("pull-buffer")
    if last and last != buf.timestamp:
        if avg:
            avg = (9*avg/10) +  (100 * 1000 * 8 * buf.size / (buf.timestamp -
last))
        else:
            avg =  8 * 1000 * 1000 * buf.size / (buf.timestamp - last)
        print i, avg, buf.size
    last = buf.timestamp

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