I want to convert some videos to play on my Kogan TV using a portable hard-drive, but I am having trouble getting it to work. Most of my avi files, encoded using as xvid, all come up as 'unsupported file' on the TV.

The only file that I've found that works is reported as being the following by file:

test.avi:  RIFF (little-endian) data, AVI, 640 x 464, 23.98 fps, video: DivX 4, audio: MPEG-1 Layer 3 (stereo, 48000 Hz)

But I can't seem to work out a suitable avconv command line to convert anything else to that format.

The TV claims to support (from here):

AVI (MPEG - 1/2 and MPEG-4 divx 4 coded) and MP4 (MPEG - 1/2 and MPEG-4 divx 4 coded)