No audio in new MKV's, working OK previously.

I have been using Seviio 0.4.1 to view tv series MKV's with no problems until yesterday when any new MKV's play with video only.
The older files which have been played before still play OK.
Mediainfo shows identical properties for old and new files.
I have tried un/reinstall to no avail.

Win7 64.

[zip]

might be that the new mkvs are not very much liked by ffmpeg, or the audio channel merging is not working properly on those. You can try enabling debug logging, play the file, get details of the ffmpeg command it uses to transcode it and run the command standalone to see what it produces.

From version 4.1.1 the author enabled by default the audio header compression. You can remux it by mkvmerge and set "no compression" under the tab "extra options".

Sorry for the delay getting back.
@ Zip. I don't understand enough of the log to find a command.
@ Harry. Your Instruction worked when I realised I had to set "no compression" on audio and video. 20 - 30 seconds per 1.3GB file.
Thank You.
Eddie.

[zip]

If you still needit, see my signature for how to enable detailed logging. Then you will see ffmpeg commands in the log (something like "ffmpeg -i somefile .........." at the time when you try playing a file that needs to be transcoded.