The “File name match” only looks at the first 89 characters of the file name. If any portion of the channel (ch4) appears after that no match will take place.
Example: ch4.mp4 will not work with: In the Americas With David Yetman - s05e03 - Mexico City’s Markets A Millennium of T - ch4.3.mp4
If you remove any character before “ch4”, the File name match ch4.mp4 will work and process the file.
*ch4*.*
Selects all channels that being with ch4 these are my PBS channels. I use MCEBuddy to trim time from both the beginning and end of these files without Comskip.
I’m unable to replicate this issue, the filename and filter you provided have worked exactly as expected, in the first filter it’s accepting the file, the second filter is rejecting the file.
You’ll have to attach your conversion log to see what’s going on. It maybe to do with something else.