From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 772BF4359F for ; Mon, 18 Jul 2022 17:14:24 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 3342268B8BD; Mon, 18 Jul 2022 20:14:21 +0300 (EEST) Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 1C13968B845 for ; Mon, 18 Jul 2022 20:14:15 +0300 (EEST) Received: (Authenticated sender: michael@niedermayer.cc) by mail.gandi.net (Postfix) with ESMTPSA id 1BC3E240007 for ; Mon, 18 Jul 2022 17:14:13 +0000 (UTC) Date: Mon, 18 Jul 2022 19:14:12 +0200 From: Michael Niedermayer To: FFmpeg development discussions and patches Message-ID: <20220718171412.GS2088045@pb2> References: <53e29d553f5944a5b0aaa75c7fa48bc1@bfi.org.uk> MIME-Version: 1.0 In-Reply-To: <53e29d553f5944a5b0aaa75c7fa48bc1@bfi.org.uk> Subject: Re: [FFmpeg-devel] Development opportunity: LTC noise on files created from videotape source: filter idea X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Content-Type: multipart/mixed; boundary="===============4694083194785152998==" Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: --===============4694083194785152998== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="3ig5MTpp3LwprTX9" Content-Disposition: inline --3ig5MTpp3LwprTX9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jul 18, 2022 at 09:53:14AM +0000, Stephen McConnachie wrote: > Hi FFMPEG developers, >=20 > I have a proposal for a paid development opportunity to add a filter to F= FMPEG. >=20 > I followed the advice on the FFMPEG Consulting page at https://ffmpeg.org= /consulting.html and am emailing this list to try to identify if any of the= FFMPEG developers may be able to take on a development commission. >=20 > Background: we are digitising high volumes of videotape carriers, and hav= e identified a common case in some videotape formats where Linear Time Code= from the tape carrier is present on audio stream 1 in the encoded file - m= anifesting as a continuous noise. >=20 > Idea: could a filter be developed in FFMPEG, based on example files we ca= n provide, to identify the presence of an LTC-derived audio stream, and add= itionally identify which of the streams is the LTC stream. >=20 > If this filter idea sounds achievable, I would aim to identify which of t= he FFMPEG developers may be able to take on this work, and estimated costs = and timeline. It should be possible to implement a LTC decoder that turns a audio track i= nto LTC binary data. If that succeeded and the data is valid then teh track wou= ld very likely have contained LTC. Do i understand correctly that the tracks are LTC or normal audio not mixed? or are there tracks that mix audio and LTC and require seperation ? I think there are several developers who could develop such filter. I could do it, Iam sure paul could do as well. thx [...] --=20 Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB "I am not trying to be anyone's saviour, I'm trying to think about the future and not be sad" - Elon Musk --3ig5MTpp3LwprTX9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABEIAB0WIQSf8hKLFH72cwut8TNhHseHBAsPqwUCYtWU4QAKCRBhHseHBAsP qwkYAJ9lkV/HIOqqZXWfGPO3JypOdzM2IACeIQST9UNt/hI0ZzXx5ASFnJ2qiFA= =SYKy -----END PGP SIGNATURE----- --3ig5MTpp3LwprTX9-- --===============4694083194785152998== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". --===============4694083194785152998==--