Sorry, yes, that was a typo on my part, but still even with 24*1000/1001 that would give a non-integer/fractional sample rate which ffmpeg will round. I will locate the correct group. Thank you. Steve
-----Original Message----- From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of Zhao Zhili Sent: Wednesday, March 19, 2025 06:05 PM To: ffmpeg-devel@ffmpeg.org Cc: ffmpeg-devel@ffmpeg.org Subject: Re: [FFmpeg-devel] 24 FPS to 23.975 Conversion with Audio > 在 2025年3月20日，上午3:35，Steve Rance <stevera...@outlook.com> 写道： > > Hello developers, my first post, if I have posted to the wrong place > please point me in the right direction > > I'm attempting to use ffmpeg to convert 24FPS media to 23.986 - Video is good > but the audio slips. This mailing list is for ffmpeg development, not user support. There is no such framerate 23.986, it’s 24 * 1000/1001. > > From my research I need a fractional sample rate for the audio. To be precise > I need 48000 × (23.976/24) ≈ 47952.047952 Hz. However, since FFmpeg’s > asetrate only accepts an integer value, ffmpeg ends up using 47952 exactly. I > have tried many if not all of the options available and the result remains > the same. > > Here are the slippage rates ... > Approximately 172.63 samples error per hour Approximately 2.88 samples > error per minute. > Approximately 20.85 seconds must elapse for each 1 sample error. > Approximately 11 hours and 35 minutes before the audio is one full frame off. > > I'm using Windows and need advice on how I could try to acheive perfect audio > sync. > > Thank you for reading. > Steve > > > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@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-requ...@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-requ...@ffmpeg.org with subject "unsubscribe".
