Are audio and video well in sync throughout the source video? If yes, can you reproduce the issue with the latest nightly (http://avidemux.org/nightly/) available (r180504 for Windows / 180503 for Linux / 180404 for macOS)? If yes, please compress and attach the application log (admlog.txt from %localappdata%\avidemux\ on Windows) to your reply.
Quote from: Dave 1867 on May 04, 2018, 05:15:29 PM
Why was just the last four minutes out of synch and the rest perfect?
Without access to the source video and without knowing the exact editing steps, it is impossible to guess what went wrong.
QuoteIs there an owner/operator manual for Version 2.7.0 of ASvidemux?
No, but there is a wiki (http://www.avidemux.org/admWiki/doku.php) (mostly severely outdated).