23. August 2014 00:08 by Jerry in
It's a known issue that audio is not working on FOSCAM FI9821W V2 even with the latest firmware. More info could be found on this post:
http://foscam.us/forum/fi9821w-v2-rtsp-via-vlc-working-for-video-but-not-audio-t10025.html
If you are interesting in applying the patch as mentioned at the end of the post above, you can download it here and uploaded at patch update:
http://www.jerryhuang.net/ipcamcontroller/FosIPC_A_patch_ver2.x.1.10_1_20140606_150128_rtsp_audio.bin
I believe this patch will be shipped in future firmware update eventually, so if audio is working for your camera, there is no need to update the patch.
Update: the patch is reported by a Foscam 9821P user that it's also working on 9821P