On Tue, 26 May 2026 08:57:46 +0900 Takashi Yano wrote: > On Mon, 25 May 2026 00:47:21 +0000 > destal takul wrote: > > Nearly every file muxed using MKVToolnix, when remuxed using the Cygwin > > version of ffmpeg with '-c copy', will result in "Invalid DTS: XX PTS: XX, > > replacing by guess" and "Non-monotonic DTS; previous: XX, current: XX; > > changing to XX. This may result in incorrect timestamps in the output > > file." warnings, while the Linux and native Windows builds (by gyan.dev) of > > the exact same ffmpeg version do not generate such warnings when remuxing > > the exact same input file. This seems to be stemming from some math library > > difference that results in incorrect parsing of timestamps in the Cygwin > > version. > > Thanks for the report. I was able to reproduce the issue. > Let me take a closer look.
I have found the cause. The cygwin ffmpeg package is based on the Fedora ffmpeg-free package, and the issue also occurs in Fedora's ffmeg-free package. In other words, the issue originates from Fedora. I have added a workaround for this problem. Please wait for 8.1.1-3, in which the issue will be fixed. -- Takashi Yano <[email protected]> -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
