Tried to convert a video.avi to video.mkv, copy both video and audio. It stops with error "Stream map '11' matches no streams."
Checking ffprobe video.avi shows
Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 608x456
Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s
Running the ffmpeg command (copied from MC console window) manually with -map 00 produces proper results...
This is not the first time i'm running into this, but peeved off enough to file a report, as using MC would be much easier due drag n drop ease with complicated network paths.