<div dir="auto"><a href="https://web.archive.org/web/20190808055748/http://www.dsg-bielefeld.de/dsg_wp/wp-content/uploads/2014/10/video_syncing_fun.pdf" target="_blank" rel="noreferrer">https://web.archive.org/web/20190808055748/http://www.dsg-bielefeld.de/dsg_wp/wp-content/uploads/2014/10/video_syncing_fun.pdf</a><div dir="auto"><br></div><div dir="auto">but I have no idea what Praat is? (some signal processing framework?)</div><div dir="auto"><br></div><div dir="auto">One user posted ffmpeg filter on his website, but since then website go down ....</div><div dir="auto"><br></div><div dir="auto">may be we can contact author directly and ask if he still has some copy?</div><div dir="auto"><br></div><div dir="auto"><a href="https://www.emirchouchane.com/async-v0.1-ffmpeg/">https://www.emirchouchane.com/async-v0.1-ffmpeg/</a><br></div></div>