Can not mux a short wav and avi files with FFmpeg Batch AV Converter about ffmpeg_batch HOT 3 CLOSED

At Batch processing tab, you have the "View last log" button.
At Stream multiplex tab, I've tried muxing one avi video stream and one wave file,
using format "avi" or "mkv" output format and it worked fine.

from ffmpeg_batch.

I will view last log first.
I found the "Batch processing" tab but I don't find the "View last log" button.
Wait I found the "View last log" button. It was between the "Try preset" and "Save queue" buttons on the bottom of the "Batch processing" tab.
I am reading now the last log file.

EDIT:

The error I described in my first comment was shown after I tried the "mp4" format.

With both "avi" and "mkv" formats now I see the following error:

Multiplexing failed:
Unknown encoder 'c'
You can check log file on main tab for more error information.

Of course that I will read that log file too but please let me know what I am doing wrong.

EDIT:

Okay I read that log file but it doesn't add any useful information. It just repeats the same error "Unknown encoder 'c'"

What does it mean at all!?

I will try google it in hope that I will find any solution for this error!

EDIT:

Okay I tried google search but did not find anything helpful.

Can someone please help me with this error?

from ffmpeg_batch.

You could send an screenshot of Stream multiplex tab, with the error.

from ffmpeg_batch.