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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 <onemda@gmail.com> Date: Mon, 18 Jul 2022 19:36:43 +0200 Message-ID: <CAPYw7P6cqEDi0ui2xTn+YmKVeGNfUZRGi2BmM645jCpD=noWiQ@mail.gmail.com> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> 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 <ffmpeg-devel.ffmpeg.org> List-Unsubscribe: <https://ffmpeg.org/mailman/options/ffmpeg-devel>, <mailto:ffmpeg-devel-request@ffmpeg.org?subject=unsubscribe> List-Archive: <https://ffmpeg.org/pipermail/ffmpeg-devel> List-Post: <mailto:ffmpeg-devel@ffmpeg.org> List-Help: <mailto:ffmpeg-devel-request@ffmpeg.org?subject=help> List-Subscribe: <https://ffmpeg.org/mailman/listinfo/ffmpeg-devel>, <mailto:ffmpeg-devel-request@ffmpeg.org?subject=subscribe> Reply-To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" <ffmpeg-devel-bounces@ffmpeg.org> Archived-At: <https://master.gitmailbox.com/ffmpegdev/CAPYw7P6cqEDi0ui2xTn+YmKVeGNfUZRGi2BmM645jCpD=noWiQ@mail.gmail.com/> List-Archive: <https://master.gitmailbox.com/ffmpegdev/> List-Post: <mailto:ffmpegdev@gitmailbox.com> On Mon, Jul 18, 2022 at 7:14 PM Michael Niedermayer <michael@niedermayer.cc> 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".