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 3D15741214 for ; Mon, 18 Jul 2022 17:34:19 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id F3B7468B8E8; Mon, 18 Jul 2022 20:34:17 +0300 (EEST) Received: from mail-yw1-f181.google.com (mail-yw1-f181.google.com [209.85.128.181]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 0A08E68B8D9 for ; Mon, 18 Jul 2022 20:34:11 +0300 (EEST) Received: by mail-yw1-f181.google.com with SMTP id 00721157ae682-31e45527da5so16657207b3.5 for ; Mon, 18 Jul 2022 10:34:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=HsK35MoKHNMfTm7NTUYm/l9EXUYsQ+2ASmGa8uIfaNs=; b=KsLM2jU4DGQ3PhGLQ9GvV5StIvy6e1FqtCG1x5v4rpIRNmU4a20BeDJBgjMEKx3SE2 ksl/mH8nap3uLLwTM27BLh/+BNiJBvtSvHuwE0VkjseKPUa9kt9/KZpXiMn6qzhsfRHV TaW1GYcFkWfORfQru8RcmJ5nVitJ10FLdliwpHcm+lCCz3cxEe6Qsgoga7EEoo47Ev+v xGFB4eFKJBFbqZN61HyFzapwHW2ZNOb7n7H742HTgEPJBd82shONr2csr3gdbCqbwd5d OjigHa1H8MKmAtoMbxMrZaiHEkt7Z0jzMIhh71fY3WjAwc+bKdGEDf2hVSOXMeuNSS39 Z75Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=HsK35MoKHNMfTm7NTUYm/l9EXUYsQ+2ASmGa8uIfaNs=; b=aaVHbIvTKKCaynvVXXKXK6bQHjZu0y6PQtBXjMx8N1gx8GA5zKJR0AgkRS/ZiDccxj DZN8yK4NY8pDb2A8YVijgwC+SL7pQTEOJvNpS71GDDqtjH+JUECnRQoYMmfNNH6fxl2W BeeOj59AEfsxBTQtWoE1Zjof/ecJDk2om8J0S8QxTqv+1d8pJ5YMHwzRlFmtKfPKAxV6 A5K737h1nGKuufOrG80qrOKbgyLaEjcrXrhZPqwBqInO8FhYqk6/zxRl79C6tRMcJwSk Y4CfASXb2HRafQ5foqjeiNy1ej4b7xAqVLLvpavdm5PyPDpzT7nP2+vxVCvSjAoZ/jAj h1Hw== X-Gm-Message-State: AJIora9zjj/Ta33s+Zj01yYaWCiaoTh5Auqj+tL2i06TtfclHhDTbRqS 2a2y8tjokw7ymOr4j0e15hoFpZBpK4HN8KIixE7xdoM9 X-Google-Smtp-Source: AGRyM1s4bj+D2eQTNlaJnSWnNrdqONtObVMt0joh+6CqBgWTx+5RCLyqDAtFJEIHmaQQrHq13ftqXb4G7C5bkiGrW7Q= X-Received: by 2002:a81:234e:0:b0:31e:2cd2:624f with SMTP id j75-20020a81234e000000b0031e2cd2624fmr6873502ywj.516.1658165649032; Mon, 18 Jul 2022 10:34:09 -0700 (PDT) MIME-Version: 1.0 References: <53e29d553f5944a5b0aaa75c7fa48bc1@bfi.org.uk> <20220718171412.GS2088045@pb2> In-Reply-To: <20220718171412.GS2088045@pb2> From: Paul B Mahol Date: Mon, 18 Jul 2022 19:36:43 +0200 Message-ID: To: FFmpeg development discussions and patches X-Content-Filtered-By: Mailman/MimeDel 2.1.29 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: On Mon, Jul 18, 2022 at 7:14 PM Michael Niedermayer wrote: > On Mon, Jul 18, 2022 at 09:53:14AM +0000, Stephen McConnachie wrote: > > Hi FFMPEG developers, > > > > I have a proposal for a paid development opportunity to add a filter to > FFMPEG. > > > > 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. > > > > Background: we are digitising high volumes of videotape carriers, and > have 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 > - manifesting as a continuous noise. > > > > Idea: could a filter be developed in FFMPEG, based on example files we > can provide, to identify the presence of an LTC-derived audio stream, and > additionally identify which of the streams is the LTC stream. > > > > If this filter idea sounds achievable, I would aim to identify which of > the 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 > into > LTC binary data. If that succeeded and the data is valid then teh track > would > 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. > Perhaps it there are clear specifications I could. > > thx > > [...] > > -- > 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 > > _______________________________________________ > 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". > _______________________________________________ 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".