[MPlayer-users] Concatenating multiple .avi files

[Jonathan Bartlett]

I'm trying to concatenate multiple .avi files to run through mjpegtools
(yes, I know lav2yuv supports multiple files, but not this many).  I found
on the internet that you can do

cat *.avi > tmp.avi
mencoder -forceidx -oac copy -ovc copy -o tmp2.avi tmp.avi

However,when I run lav2yuv on these files, I get the following error:

Not a JPEG file: starts with 0x1f 0x07 ++
WARN: [lav2yuv] Decoding of Frame 0 failed

Does anyone know why?

Thanks,

Jon