Audio is not playing properly in ffmpeg player

Audio is not playing properly in ffmpeg player

I need to create a player which will decrypt the input on-fly and play the
content. I have choosen ffmpeg libs (libav*) to create player and to start
I have followed this link
but audio is not playing properly,video is playing fine. I am using ubuntu
12.04LTS 64bit OS with the following ffmpeg version,
admin@vz-X401A1:~$ ffmpeg ffmpeg version 2.0 Copyright (c) 2000-2013 the
FFmpeg developers built on Sep 11 2013 13:46:26 with gcc 4.6
(Ubuntu/Linaro 4.6.3-1ubuntu5) configuration:
--prefix=/home/admin/ffmpeg_build
--extra-cflags=-I/home/admin/ffmpeg_build/include
--extra-ldflags=-L/home/admin/ffmpeg_build/lib --bindir=/home/admin/bin
--extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac
--enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
libavutil 52. 43.100 / 52. 43.100 libavcodec 55. 31.101 / 55. 31.101
libavformat 55. 16.102 / 55. 16.102 libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 84.100 / 3. 84.100 libswscale 2. 5.100 / 2. 5.100
libswresample 0. 17.103 / 0. 17.103 libpostproc 52. 3.100 / 52. 3.100
Hyper fast Audio and Video encoder usage: ffmpeg [options] [[infile
options] -i infile]... {[outfile options] outfile}...
Use -h to get full help or, even better, run 'man ffmpeg' admin@vz-X401A1:~$
and downloaded tutorial07.c from this link
still, with this also, sound is not playing properly.
I need help to solve the following issues,
1> How can I fix this audio issue(I have gone through similar question in
StackOverflow and installed old ver. of ffmpeg, but issue still remains).
2> And also suggest some steps or tutorial, how to implement on-fly
decryption process (in C) and integrate this with the player.
Thank You.