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([2a01:4b00:879d:9500:2dbd:ac06:c617:1dad]) by smtp.gmail.com with ESMTPSA id t23-20020a1c7717000000b003fbb9339b29sm5765576wmi.42.2023.07.27.18.49.26 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Jul 2023 18:49:27 -0700 (PDT) Message-ID: <7d077a86-496d-b3af-7b10-fb4cb8c9aa89@gmail.com> Date: Fri, 28 Jul 2023 02:49:26 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 To: ffmpeg-devel@ffmpeg.org Content-Language: en-US From: Misha Aizatulin Subject: [FFmpeg-devel] looking to hire expert for a short project: lossless screen and sound capture 4k@60hz 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Hi all, I've been directed here from https://ffmpeg.org/consulting.html as I'm looking to hire an expert for what should hopefully be a simple but well-paid job. Please let me know if anyone has availability! What I'm trying to do is capture demoscene demos in full quality: 4k@60hz (with sound of course). My rig is presentable: nvidia A6000 and 192G RAM. I am a software engineer, but don't know very much about video processing or ffmpeg. I tried: ffmpeg -filter_complex ddagrab=0,hwdownload,format=bgra,framerate=60 -c:v utvideo output.mkv What happened: the first minute or so (always roughly the same length of time) is captured fine. Then it drops off the cliff, something like 1 frame per 3 seconds, but also trying to interpolate between them, so it looks really weird. I was not able to get ffmpeg to report to me any dropped frames which is upsetting and worrying. I also don't understand where the interpolation comes from and would love to turn it off. I can't think of a reason for the droppage: my RAM is big enough to hold the full video (about 50G total). My only theory is that GPU memory might be getting full (will check tomorrow), but I'd expect hwdownload rates to not be that slow. Maybe I should use hevc_nvenc with lossless setting, but there's some talk about the yuv420 conversion being not lossless... Anyway, would really appreciate someone educating me on these and would happily pay for your time! Best, Misha _______________________________________________ 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".