Muxer Cannot Open

[flyer201]

I've been a long time user of Avidemux though I'd hardly call myself advanced. It has just worked and worked very well.

I have used it on a Win10 pro computer without issue, however rather abruptly I receive a message that the muxer cannot open when trying to write an mp4 file to mkv. It doesn't seem to matter what .mp4 file I load...I always get this error message using ver 2.7.5   I uninstalled 2.7.5 and installed 2.8.1 and have exactly the same problem.

I'm unsure how to progress this sudden change in behavior. Thanks in advance for assistance.

[eumagga0x2a]

First of all, v2.7.5 is ancient and absolutely unsupported (v2.8.1 is also ancient, to be honest). Please remove v2.8.1, delete its program directory, then re-install (rather the latest VC++ 2.8.2 nightly from https://avidemux.org/nightly/vsWin64/ than the latest release from soon 3 years ago) to an empty directory.

If the problem persists, please start Avidemux afresh, reproduce it, close Avidemux and provide admlog.txt from %localappdata%\avidemux\ directory (you may sanitize it by consistently replacing paths with placeholders first) as an attachment to your reply.

Please also make sure you never run multiple instances of Avidemux concurrently.

[flyer201]

Thank you very much! Problem is solved!