Date: Fri, 05 Feb 1999 10:57:51 +0900 From: Katsushi Kobayashi <ikob@koganei.wide.ad.jp> To: drew@Poohsticks.Org Cc: hardware@FreeBSD.ORG Subject: Re: 1394/DV comments, capture program, mailing list Message-ID: <19990205105751S.ikob@koganei.wide.ad.jp> In-Reply-To: Your message of "Wed, 03 Feb 1999 20:41:47 -0700" <199902040341.UAA03651@chopper.poohsticks.org> References: <199902040341.UAA03651@chopper.poohsticks.org>
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I do not have sufficient information about IPR concerning DV.
I think there are too many IPR of video/voice encoding techniqueue.
But, I believe untouching encoding is completely safe such as only
capture picture frame that Drew provided.
BDW, the DV related specification can also purchase as IEC std.
I think the IEC spec. is the same of the BLUEBOOK, given by you.
To buy from IEC may be easy for the people outside Japan.
The IEC spec. information is as follows:
IEC 61834 series. (It may define DV encoding. But, I have not read it.)
IEC 61883 series. (It defines the packet format in IEEE1394)
Katsushi Kobayashi
ikob@koganei.wide.ad.jp
From: Drew Eckhardt <drew@Poohsticks.Org>
Subject: 1394/DV comments, capture program, mailing list
Date: Wed, 03 Feb 1999 20:41:47 -0700
> On Wed, 27 Jan 1999 15:46:37 +0900, Katsushi Kobayashi <ikob@koganei.wide.ad.jp> wrote:
> >But, my driver will be helpful some people for following purposes:
> >
> >- To use DV equipements.
>
> I have both professional and personal interests in DV (I use a helmet
> mounted PC1 for sports video), and would love to play with it on my
> unix boxen although there are a few impediments:
>
> 1. Matsushita (Panasonic) has patents applicable to anything which
> extracts video and/or audio from the a DV data stream (see US
> Patent 5,691,819) as well as ones on the most obvious techniques
> for transcoding to DV.
>
> This is a huge impediment to bazaar style development of most unix DV
> software, and it would be wonderful if you or some one else in geographic
> proximity to them were to work out some sort of compatable licensing
> agreement. As of 1997, their General Manager of Intellectual Property was
>
> Mr. R. Shimizu
> c/o<A0> AVC Products Development Lab<A0>
> 2-15 Matsuba-cho, Kadoma-shi
> Osaka 571
> Japan
> FAX: +81-6-905-5408
>
> 2. Patent issues aside, to do anything really fun with DV you
> need documentation (the shuffling algorithm, code book,
> quantization tables), with the obvious source being the
> "Blue Book". Unfortunately, that carries a 50,000 yen price tag
> (about $440 USD at the current exchange rates).
>
> Fortunately, the subset of it embodied by DVCPRO/D7 (locked audio,
> 4:1:1 sampling on both NTSC and PAL) is described in the affordable
> ($55) SMPTE 306m standard.
>
> 3. You also need to get the data to disk. I poked at the problem for
> parts of two evenings (write() often blocks long enough to cause dropped
> packets), and came up with the following program
>
> ftp://ftp.poohsticks.org/dv/capture-0.1.tar.gz
>
> which captures a user-specified number of DV frames off a Lynx board.
> In theory, PAL should work too although for obvious reasons I've only
> tested NTSC.
>
> The two process write behind code needed to avoid dropped packets is C++,
> and the DV structure definitions use __attribute__((packed)) so egcs is
> needed to compile it.
>
> With a few changes to capture based on time code and with a matching
> output program, this will make it possible to do assemble edits separated
> by simple cuts.
>
> 4. I find this interesting, have seen a handful of comments on the dv
> mailing list regarding dv under unix, and have set up a mailing list
> for discussing the technical and legal issues of dv under free unicies
>
> frunix-dv-request AT poohsticks DOT org
>
>
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