Using f4vpp.exe with MP4 file results no audio

Hello,

I'm recording MP4 webcam videos using Flash 11.1.102.63 and publishing them on my FMS 3.5.6.  When playing back MP4 files using my Flash player, both video and audio works perfectly.

However, I also need to make my MP4 files play on other players (like Windows Media Player).  As I found out quickly, the MP4 file encoded by FMS is not playable without conversion.  After some googling, I found that the post processor tool f4vpp.exe allows to flatten the MP4 file so that it plays with Media Player.

The problem is that F4VPP seems to remove the audio part in the file.  My MP4 file consists of H264 video and NellyMooser audio (which is the default audio recording codec with Flash).  I also tried using Speex codec for audio but still no sound after using F4VPP.

I've seen some comments around about this bug.  Unfortunately, the download page (http://www.adobe.com/products/flash-media-server-family/tool-downloads.html) refers to the tool as dated of June 2009.  Is there an updated version with a fix?

Otherwise, I'm trying to reproduce the work done by the tool using ffmpeg.exe.  So far, the closes I have been able to do is this:

ffmpeg.exe -i input.mp4 -c:v copy -ar 44100 -async 1 -sameq output.mp3

The problem is that the video encoding seems loosing something, as the output video has blocky/pixelated parts in the video that seems random.  Probably related to something in the conversion, but I can't figure out what.

Can anyone point me to a solution?

Thanks.