Re: [Cellar] Experimental elements

Steve Lhomme <> Sun, 24 June 2018 13:31 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 42A84130DF4 for <>; Sun, 24 Jun 2018 06:31:58 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.91
X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_DKIMWL_WL_MED=-0.01] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (2048-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id RbAH3KRXF1BD for <>; Sun, 24 Jun 2018 06:31:56 -0700 (PDT)
Received: from ( [IPv6:2607:f8b0:400e:c00::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by (Postfix) with ESMTPS id 4CA301277D2 for <>; Sun, 24 Jun 2018 06:31:56 -0700 (PDT)
Received: by with SMTP id a11-v6so5235146pff.8 for <>; Sun, 24 Jun 2018 06:31:56 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=KwdP3PMmnP6bhvxjuHXX3fFhq+SzFHDZQEudWvOq04Y=; b=oppZajpDp8nwbilRHPVAfRocWxo+vgcyphyfLVjiVn2gb6bWHzO4tb+ZsZtPEgv4sW TXRVwleMAMRj0c3eJR9faIF/Nr7HAd3s/GYAgIFxwVbF0HCZ3c6227jGHRK8yNSAu1sK gG2Fe2BxrgEG9KLRjBWHrggjn8Sg8F96mGzKWbSyGM7TgGqTk6cup3XVise+ZWfiS6tG gZiLFdLD7V1hfJaV58RKaA1Ol6YdteRSxZhEcIrCkhwmqOpYvZFJG8eQlpIDmuLdxuoS Kmw+mw8x4o3RfuEZ0kpCz6n1ph+PaI1qSow9zm29EV64m0or3X7N4czxEA9OlHAYIb1d +y7A==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=KwdP3PMmnP6bhvxjuHXX3fFhq+SzFHDZQEudWvOq04Y=; b=ClgrQWYuCEl3GazlhVgjaAqjO3sG0yCKmiFgWBbiEXN2Nk5hqojKgivP3Owh8NcV6+ DjoNj/dPxAufnu/Ib7UxGBiy+lnnHmzHOZ2dx+VoY4TPhEREXaeMjLeP2c1nph1ktaCe DERmzLPV5BeQIewPzHVEgrGtZrsSt2FQBSFT4eUadBiWmmFVlGms8/FgdA0yU6aHpW8f TqhpYbQHk3bp4Q22TuRWj5pm3H1NPSvKsnBZXF9fCdMnAum3slSmEIVb9LSXpFbtn2vE oTVtoDZrvauUaMPb+lrzeiDykcivIoK1K0AC4ViglxhjcuHdj5K1aRjTUDNV5hkB7zIT 8BCQ==
X-Gm-Message-State: APt69E3rTbar8NrHyCpOYuLZE9VicvsIDeMtOVce+wet2DrmMRtFihxP +jcWnn7OP4Bq6fwmnU51+Vqqsd4Qfw4QaCKZ45tvcg==
X-Google-Smtp-Source: ADUXVKL/+UYZRWBMqAaMJxkNLBrzhNLqM4Amor93fPJpOE/K0Px+wsFcJtZo3A2ED3n9EZjW3sbSrdXXHAp2Hdkj8bw=
X-Received: by 2002:a62:830e:: with SMTP id h14-v6mr9347034pfe.64.1529847115656; Sun, 24 Jun 2018 06:31:55 -0700 (PDT)
MIME-Version: 1.0
Received: by 2002:a17:90a:17af:0:0:0:0 with HTTP; Sun, 24 Jun 2018 06:31:55 -0700 (PDT)
In-Reply-To: <>
References: <>
From: Steve Lhomme <>
Date: Sun, 24 Jun 2018 15:31:55 +0200
Message-ID: <>
To: Codec Encoding for LossLess Archiving and Realtime transmission <>
Content-Type: text/plain; charset="UTF-8"
Archived-At: <>
Subject: Re: [Cellar] Experimental elements
X-Mailman-Version: 2.1.26
Precedence: list
List-Id: Codec Encoding for LossLess Archiving and Realtime transmission <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Sun, 24 Jun 2018 13:31:59 -0000

PS: I apologize in advance but I won't be able to make it to the
CELLAR virtual meeting on Tuesday, I have previous commitments to

2018-06-24 15:30 GMT+02:00 Steve Lhomme <>rg>:
> As discussed in
> We need
> a clean way to define experimental elements. So that new elements can
> be added/tested while not having to iterate the DocType version each
> time. Especially as the they are meant to be backward compatible as
> much as possible.
> I added to proposal on GitHub:
> - a simple
> DocType sub-version that allows iteration between different versions
> before new elements are finalized in a new DocTypeVersion.
> - a list
> of DocTypeExtension which allow different groups to work on different
> subsets of elements, each with their own name (or workgroup or
> namespace).
> In any case elements from each proposal don't have to be handled so
> long as the EBML Reader can handle the DocTypeReadVersion. But if they
> can, it's nice.
> Following this concept, I wonder if Tags could exist as a Matroska
> Extension, possibly not part of the main DocTypeVersion at all.
> Jerome wanted some extra elements, this could be done this way as well
> in a clean way.
> Note that an extension version depends on the DocTypeVersion it's in.
> So moving from matroska v4 to matroska v5, each "independent"
> extension should have an update if they want to keep working. Or we
> could not do that at all and allow extensions having a life of their
> own. Maybe there could be 2 types of extensions: those which goal is
> to be merged in the main DocTypeVersion, those standalone.
> The DivX elements are good examples of extensions that could leave on
> their own. And we wouldn't have to put them in the main spec and
> wonder how they could work. On the other hand these old files don't
> advertise this extension...
> --
> Steve Lhomme
> Matroska association Chairman

Steve Lhomme
Matroska association Chairman