From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 842CC287276; Sun, 1 Feb 2026 20:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769977299; cv=none; b=Ol34VNkQET3Gccq1FG3HC59+LpARAXyz++YYNi5ZSbZ+BIhzpy239qXufWP3+RE6kvAJ+gqv/+cCFMs+hVVIuaKUj4q/p/3TB5pmzViBGnttBeB4+b/652zLUzt/tvTK+V5sbDi1kf/1BbmUmzheZO1UKsdWQ/z6awsIFZUhsjw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769977299; c=relaxed/simple; bh=CkH9yVB84s1QFeZx86mJT6lmIvRcBRsoPIFbntUlbkk=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=P/e3fwYMVDACHWunCexJbNqiMC5zcEpZS/B1sD/ea+0A1tObcpn2irQ88bsZUM6VBFbtS+D06Rn13cE3LhauPbMR130HebMv38i5WMyrkY84yHVmtpH6NzEZfEmDcLBniDDYFuBD9AXMYOpTJm6K4OLT9EUqm3LvC99PqL2iFxI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gIXu82bh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gIXu82bh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6645AC4CEF7; Sun, 1 Feb 2026 20:21:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769977299; bh=CkH9yVB84s1QFeZx86mJT6lmIvRcBRsoPIFbntUlbkk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=gIXu82bhYEl2Vmid6X5BMAAUH+UM6ceNzrS7B77vJWnWtMPfjZHg32tTiYsXsE6cH Mz4j676iZQLZZEMyTtggBc2bl0YNl+QyW7MJjjfRPl764MlUZGZG+PjtBIoiQjW0AY hhKvm0UapywEx06kk1nskca5gZqHxnAI5eYtS3yUUrDSyT+2qFEMcdVx4ZcuDjCF02 QPwj9aas1YLVmNzBALDsy9E1digSqGtPXa8dhrSQOODaoqkioMJ7CcypbLILAlsiHF YZ4722hbHAhjjh+CQESvSOV96qkLVNL0p7vp2WovTE2H7hzlxj0bC2aE6BW2JVQ9YP V/UbDkOIvfgrQ== Date: Sun, 1 Feb 2026 21:21:33 +0100 From: Mauro Carvalho Chehab To: Oleksandr Natalenko Cc: Laurent Pinchart , Jarkko Sakkinen , linux-media@vger.kernel.org, jani.nikula@linux.intel.com, anisse@astier.eu, Mauro Carvalho Chehab , Hans Verkuil , Sakari Ailus , Jacopo Mondi , Ricardo Ribalda , open list Subject: Re: [RFC PATCH] media: Virtual camera driver Message-ID: <20260201212133.1849a49e@foz.lan> In-Reply-To: <12828248.O9o76ZdvQC@natalenko.name> References: <20260201133342.335680-1-jarkko@kernel.org> <20260201200649.GW3374091@killaraus> <12828248.O9o76ZdvQC@natalenko.name> X-Mailer: Claws Mail 4.3.1 (GTK 3.24.51; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Sun, 01 Feb 2026 21:14:54 +0100 Oleksandr Natalenko wrote: > Hello. >=20 > On ned=C4=9Ble 1. =C3=BAnora 2026 21:06:49, st=C5=99edoevropsk=C3=BD stan= dardn=C3=AD =C4=8Das Laurent Pinchart wrote: > > > There is a notable user base for v4l2-loopback. It is the defacto cho= ice > > > for streaming phone cams. =20 > >=20 > > This will then likely face the same hurdles as v4l2-loopback, the main > > one being that camera support should be upstreamed with proper drivers > > instead of a closed-source userspace daemon. > >=20 > > For phone cameras, the way forward upstream is libcamera. Until kernel > > drivers for ISPs are available, the soft ISP is a stop-gap solution. It > > recently gained GPU acceleration support (with work to improve image > > quality with additional algorithms ongoing). =20 >=20 > My use-case for v4l2loopback is to stream a webcam from one machine to an= other (with the help of ffmpeg). Is this covered by something other than v4= l2loopback now? Using a kernel driver for something like that is a bad idea and may end causing dead lock problems. You may also have performance issues and high network traffic. The best solution for it is to use a proper userspace tool, like obs: https://obsproject.com/kb/linux-installation Thanks, Mauro