Problem converting an MKV with 2 audio channels to an MP4 with 1..

[jweaver]

First try the resample fps filter and set it to whatever is defined in the original.
Needs a recode of course and do it on a small segment.
Small segment = quick encode = quick check on WD.
If it works do the whole thing and check again on the WD.
Ditto for changing the profile setting.

At least then you are taking logical steps to zero in on what might upset the WD.

Good point. My plan was to clip a short section.. And then work with that to try and find the right combination.. I am just looking now.. Where is the "Resample FPS Filter". I am looking in the "Frames Tab" and can't see it..  Are you talking about th "Change FPS" in the Filters section..

And where is the "profile" set?

Jon

[AQUAR]

No - I am talking about the resample fps filter.

Use 'output - configure' to change the behaviour of the x264 compressor. 
Under the general tab - basic - untick 'advanced configuration - profile (default baseline).

Before everything else, my very first trial/test would be to cut an about 5 min segment starting from the second Idr frame and ending at an Idr frame.