export videos without sound

[Stan Young]

1) Does the video play and seek correctly with "avplay"?
plays good, no sound.

2) Does the video play and seek correctly with "melt"?
plays good, no sound.

3) Please include details on the video file (using the following command):
       $ avmpeg -i 'MyVideo.mp4'

stan@stan-M250:~/Desktop/temp$ avplay test.avi
avplay version 11-6:11-1, Copyright (c) 2003-2014 the Libav developers
  built on Sep 26 2014 14:34:54 with gcc 4.9.1 (Ubuntu 4.9.1-15ubuntu1)
[avi @ 0xaeb026a0] max_analyze_duration 5000000 reached
Input #0, avi, from 'test.avi':
  Metadata:
    encoder : Lavf56.1.0
  Duration: 00:00:37.03, start: 0.000000, bitrate: 771 kb/s
    Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 320x240 [PAR 1:1 DAR 4:3], 29.97 fps, 29.97 tbn, 29.97 tbc
    Stream #0.1: Audio: vorbis, 44100 Hz, stereo, fltp, 256 kb/s
   0.00 A-V:-64.856 s:0.0 aq= 0KB vq= 0KB sq= 0B f=0/0 f=0/0

4) Please attach a small sample video (less than 10 MB), which reproduces the problem.
yes.

Architecture (32 bits) : 32
Operating System & version: Lubuntu, Ubuntu 14.10
Installation Method : Synaptic pkg mgr
Version of Openshot installed : OpenShot 1.4.3
BZR Revision used (if any) : ??
MLT/melt version: melt 0.9.2
FFmpeg (i.e.libavcodec) version :
avplay 11-6:11-1
libavutil 54. 3. 0 / 54. 3. 0
libavcodec 56. 1. 0 / 56. 1. 0
libavformat 56. 1. 0 / 56. 1. 0
libavdevice 55. 0. 0 / 55. 0. 0
libavfilter 5. 0. 0 / 5. 0. 0
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 0. 0 / 3. 0. 0

FFmpeg installation : avplay, Synaptic