Received: by 10.58.85.163 with SMTP id i3mr625836vez.18.1344010542842;
        Fri, 03 Aug 2012 09:15:42 -0700 (PDT)
X-BeenThere: discuss-webrtc@googlegroups.com
Received: by 10.52.21.207 with SMTP id x15ls3293893vde.1.gmail; Fri, 03 Aug
 2012 09:15:39 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.52.67.71 with SMTP id l7mr264988vdt.12.1344010539472; Fri, 03
 Aug 2012 09:15:39 -0700 (PDT)
Authentication-Results: ls.google.com; spf=pass (google.com: domain of
 boss...@yahoo.fr designates internal as permitted sender)
 smtp.mail=boss...@yahoo.fr; dkim=pass
 header...@yahoo.fr
Received: by f2g2000vbm.googlegroups.com with HTTP; Fri, 3 Aug 2012 09:15:39
 -0700 (PDT)
Date: Fri, 3 Aug 2012 09:15:39 -0700 (PDT)
In-Reply-To: <d9a6f42a-3cc1-4c32-a872-85985f1be809@googlegroups.com>
References: <d9a6f42a-3cc1-4c32-a872-85985f1be809@googlegroups.com>
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows NT 6.0; rv:14.0) Gecko/20100101 Firefox/14.0.1,gzip(gfe)
Message-ID: <af44be72-eb3a-45a8-9b8e-1138224ce749@f2g2000vbm.googlegroups.com>
Subject: Re: VP8 partition question
From: Mamadou <boss...@yahoo.fr>
To: discuss-webrtc <discuss-webrtc@googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

You're not looking at the right place. For RTP packetization:
http://tools.ietf.org/html/draft-ietf-payload-vp8-03
The right field is 'PartID' which takes 4bits. For more information:
'4.2. VP8 Payload Descriptor'
For example:
- Packetization:
http://code.google.com/p/doubango/source/browse/branches/2.0/doubango/tinyD=
AV/src/codecs/vpx/tdav_codec_vp8.c#636
- Depacketization:
http://code.google.com/p/doubango/source/browse/branches/2.0/doubango/tinyD=
AV/src/codecs/vpx/tdav_codec_vp8.c#345

On Aug 3, 4:17=A0pm, chrisgNH <cgo...@iocom.com> wrote:
> RFC 6386 Talks about multiple data partitions, and states in part: "A
> two-bit L(2) is used to indicate the number of
> =A0 =A0coefficient data partitions within a compressed frame. =A0The two =
bits
> =A0 =A0are defined in the following table..."
>
> My question is: Where are these two bits located in the data stream? =A0W=
ill
> these 2 bits always be there - or only when there are more than the two
> default partitions? =A0I have VP8 encoding working, and I'm currently
> implementing RTP packetization. =A0I've looked at the ietf draft for VP8
> packetization as well. =A0While this does mention multiple data partition=
s,
> and that they will be contiguous in the bitstream, I'm unclear as to how =
to
> determine if there are more than 2 partitions.
>
> Any help would be appreciated.
> Thanks.