From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A82AAC282CA for ; Tue, 12 Feb 2019 21:18:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7396D2081B for ; Tue, 12 Feb 2019 21:18:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="bYLy80Ww" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7396D2081B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=EKtjNoGMTK1Istk/vEBDdVl93R2/nlimr5chg4iVRgo=; b=bYLy80Ww1Sai3H VXGany1CRrrvmak5r6g/H2d9dTL7DrNqV22hWB/D5ysSSXHBA7VeSlgx1joCYkiLydLtQ9QgtpeTj /noZONpBKq3w/skoEPxNMhWSdaRLr56MCkZrNgAcGql17tLzFrzfuukvwURlcNFd3nqcu4SCI4Rhp GmHbB8SV8Yla5COkSdTy4U/NrcENhVL6hCq1DEEIyNW/m5cgvAfjfYhLOqRn+joDP2ASdPQj57vYm xudK3E/CYIofOV6vIr8UEYrVmS8cx+bGLmq8wAEAX2VRGGr6nc/GFPGtka6bfGkhII3ZGLIvcN0zY hexlU9mg4aP1UzEOuiJg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gtfRS-0006sr-9F; Tue, 12 Feb 2019 21:18:10 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gtfRP-0006sM-9I for linux-arm-kernel@lists.infradead.org; Tue, 12 Feb 2019 21:18:08 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: ezequiel) with ESMTPSA id 20B0327FB65 Message-ID: Subject: Re: [PATCH v3 1/2] media: uapi: Add H264 low-level decoder API compound controls. From: Ezequiel Garcia To: Maxime Ripard , Hans Verkuil Date: Tue, 12 Feb 2019 18:17:52 -0300 In-Reply-To: <20190212130548.tytlxmbu4q6qgzzq@flea> References: <562aefcd53a1a30d034e97f177096d70fb705f2b.1549895062.git-series.maxime.ripard@bootlin.com> <716ae1ff-8e62-c723-5b5a-0b018cf6af6a@xs4all.nl> <20190212130548.tytlxmbu4q6qgzzq@flea> Organization: Collabora User-Agent: Evolution 3.30.5-1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190212_131807_454117_C758C89F X-CRM114-Status: GOOD ( 15.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , acourbot@chromium.org, jonas@kwiboo.se, jenskuske@gmail.com, linux-sunxi@googlegroups.com, linux-kernel@vger.kernel.org, jernej.skrabec@gmail.com, tfiga@chromium.org, Paul Kocialkowski , Chen-Yu Tsai , hans.verkuil@cisco.com, Laurent Pinchart , sakari.ailus@linux.intel.com, Guenter Roeck , nicolas.dufresne@collabora.com, posciak@chromium.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 2019-02-12 at 14:05 +0100, Maxime Ripard wrote: > Hi, > > On Mon, Feb 11, 2019 at 04:21:47PM +0100, Hans Verkuil wrote: > > > I think the API should be designed with 4k video in mind. So if some of > > > these constants would be too small when dealing with 4k (even if the > > > current HW doesn't support this yet), then these constants would have to > > > be increased. > > > > > > And yes, I know 8k video is starting to appear, but I think it is OK > > > that additional control(s) would be needed to support 8k. > > > > Hmm, 4k (and up) is much more likely to use HEVC. So perhaps designing this > > for 4k is overkill. > > > > Does anyone know if H.264 is used for 4k video at all? If not (or if very > > rare), then just ignore this. > > I don't know the state of it right now, but until quite recently > youtube at least was encoding their 4k videos in both VP9 and > H264. They might have moved to h265 since, but considering 4k doesn't > seem unreasonable. > Just asked the multimedia team here, and they say that 4k videos are in fact widely used for both H264 and VP9 because of the HEVC licensing issues, and because gains in compressions are not so impressive. Regards, Ezequiel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel