How to merge videos by avconv?

Question

I have several chunks in folder.

0001.mp4
0002.mp4
0003.mp4
...
0112.mp4

I would like to merge them into full.mp4

I tried to use:

Answer 1

For mp4 the only working solution I found was with MP4Box from gpac package

#!/bin/bash
filesList=""
for file in $(ls *.mp4|sort -n);do
    filesList="$filesList -cat $file"
done
MP4Box $filesList -new merged_files_$(date +%Y%m%d_%H%M%S).mp4

or command is

MP4Box -cat file1.mp4 -cat file2.mp4 -new mergedFile.mp4

with mencoder and avconv I could'nt make it work :-(