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List: theora
Subject: [theora] PSNR Drop at every I frame.
From: "S M RAO NALLAM" <nsrao () tataelxsi ! co ! in>
Date: 2008-04-23 8:45:42
Message-ID: 003701c8a51e$c0268150$31053c0a () telxsi ! com
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Dear all,
i m using 1.0beta2 version of theora encoder for my production work.
i have encoded one QVGA stream at 300kbps stream with the following
configuration.
sharpness---------------------------0
noise_sensitivity------------------6
keyframe_frequency-------------64.
same stream has been decoded using theora decoder.
PSNR has been calculated for the decoded stream but the value of PSNR is
dropping drastically at each 64th frame.
can anybody please let me know why this is happening like this.
Regards,
Nallam.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.3268" name=GENERATOR></HEAD>
<BODY>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=185304108-23042008>Dear
all,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=185304108-23042008>i m
using 1.0beta2 version of theora encoder for my production
work.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=185304108-23042008>i have
encoded one QVGA stream at 300kbps stream with the following
configuration.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#ff0000 size=2><SPAN
class=185304108-23042008>sharpness---------------------------<FONT
color=#800080>0</FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#ff0000 size=2><SPAN
class=185304108-23042008>noise_sensitivity------------------<FONT
color=#800080>6</FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#ff0000 size=2><SPAN
class=185304108-23042008>keyframe_frequency-------------<FONT
color=#800080>64</FONT>.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#ff0000 size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=185304108-23042008>same
stream has been decoded using theora decoder.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=185304108-23042008>PSNR
has been calculated for the decoded stream but the value of PSNR is dropping
drastically at each 64th frame.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=185304108-23042008>can
anybody please let me know why this is happening like this.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008>Regards,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=185304108-23042008>Nallam.</SPAN></FONT></DIV><p>The information contained in \
this electronic message and any attachments to this message are intended for the \
exclusive use of the addressee(s) and may contain proprietary, confidential or \
privileged information. If you are not the intended recipient, you should not \
disseminate, distribute or copy this e-mail. Please notify the sender immediately and \
destroy all copies of this message and any attachments contained in it.
Contact your Administrator for further information.
</p>
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