Sorry for the lack of details, here is the mencoder instructions:
mencoder "C:\*\Watch\Blue Drop\[Genjo]_Blue_Drop_-_04_[h264][FCB46B60].mkv" -idx -forceidx -ovc xvid -xvidencopts bitrate=500:me_quality=6:max_bframes=0:quant_type= h263:turbo:nochroma_me:notrellis:vhq=0 -vf scale=320:240 -aspect 320/240 -oac mp3lame -lameopts cbr:br=96:mode=1 -srate 44100 -o "C:\*\Watch\Blue Drop\[Genjo]_Blue_Drop_-_04_[h264][FCB46B60]_converted.avi" -subfont-text-scale 3 -vf-add harddup -sid 0 -noodml -of avi
The error looks like this:
Too many audio packets in the buffer: (4098 in 883988 bytes).
Maybe you are playing a non-interleaved stream/file or the codec failed?
For AVI files, try to force non-interleaved mode with the -ni option.
And the resultant file is 10min 16 sec out of a 24min video.
Using -ni results in the same error, so either I do not know how to use it or it is not helping.