I get this error when I try to convert an wmv to 3gp using this command:
ffmpeg -y -i "inputvid.wmv" -vf scale=352:288 \
-f 3gp -vcodec h263 -r 15 -b:v 200k \
-acodec libvo_aacenc -ac 2 -ar 32000 -b:v 64k \
"outputvid.3gp"
(The command is actually derived from Mobile Media Converter 1.8.2 which recently fails on each conversion and I'm trying to troubleshoot.)
I have made the latest stable ffmpeg (version 0.10.8-7:0.10.8-1~raring1) using these instruction.
I appreciate your hints to either install libvo_aacenc, or some other codec to make conversion possible.