Re: [Cellar] [FFmpeg-devel] [PATCH] avcodec/ffv1: Support for RGBA64 and GBRAP16

Michael Niedermayer <michael@niedermayer.cc> Sat, 03 February 2018 13:48 UTC

Return-Path: <michael@niedermayer.cc>
X-Original-To: cellar@ietfa.amsl.com
Delivered-To: cellar@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D81EF12D886 for <cellar@ietfa.amsl.com>; Sat, 3 Feb 2018 05:48:28 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.62
X-Spam-Level:
X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z_DZy-QHwsR2 for <cellar@ietfa.amsl.com>; Sat, 3 Feb 2018 05:48:27 -0800 (PST)
Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2D086127201 for <cellar@ietf.org>; Sat, 3 Feb 2018 05:48:27 -0800 (PST)
X-Originating-IP: 213.47.41.20
Received: from localhost (213-47-41-20.cable.dynamic.surfer.at [213.47.41.20]) (Authenticated sender: michael@niedermayer.cc) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 215621720AE; Sat, 3 Feb 2018 14:48:24 +0100 (CET)
Date: Sat, 03 Feb 2018 14:48:24 +0100
From: Michael Niedermayer <michael@niedermayer.cc>
To: Codec Encoding for LossLess Archiving and Realtime transmission <cellar@ietf.org>
Cc: ffmpeg-devel@ffmpeg.org
Message-ID: <20180203134824.GM3129@michaelspb>
References: <20180203120734.GL3129@michaelspb> <r470Ps-10116i-366B8B5E9B0C48B78A66399443F70F73@Castor.local>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="GeONROBiaq1zPAtT"
Content-Disposition: inline
In-Reply-To: <r470Ps-10116i-366B8B5E9B0C48B78A66399443F70F73@Castor.local>
User-Agent: Mutt/1.5.24 (2015-08-30)
Archived-At: <https://mailarchive.ietf.org/arch/msg/cellar/e_c02iPKLrsOqQ3HgyLwjn5qvRc>
Subject: Re: [Cellar] [FFmpeg-devel] [PATCH] avcodec/ffv1: Support for RGBA64 and GBRAP16
X-BeenThere: cellar@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Codec Encoding for LossLess Archiving and Realtime transmission <cellar.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/cellar>, <mailto:cellar-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/cellar/>
List-Post: <mailto:cellar@ietf.org>
List-Help: <mailto:cellar-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/cellar>, <mailto:cellar-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sat, 03 Feb 2018 13:48:29 -0000

On Sat, Feb 03, 2018 at 01:58:10PM +0100, Reto Kromer wrote:
> Michael Niedermayer wrote:
> 
> >To clarify my suggestion,
> >the algorithm should be tuned for high bit depth before using
> >it for long term storage. This would be v4 (or later).
> >Personally i would wait for v4 and not use v3 for high bit
> >depth. Which is why i think its not smart to extend the v3
> >implementation with more high depth support.
> 
> The issue is that in the real world we need to use the format
> now. Otherwise the film archives must use MXF/DPX instead of
> Матрёшка/FFV1. That's the point!

Then using the v3 16bit is probably the most realistic option.
And jeromes patch should probably be applied

I hope this will not reduce interrest in working on a improved 
9-16bit mode in v4.


[...]

> Last but not least, since almost two years now it's impossible
> to work on the development of FFV1 v4. It's always the wrong
> time and/or the wrong place every time I am doing something for
> this cause. Why? This is extremely frustrating.

I want to understand this too. IMO v4 development should be more
important than or at least equally to the v3 draft polishing and neither 
should block the other.


-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Republics decline into democracies and democracies degenerate into
despotisms. -- Aristotle