wav file recorded with voice downlink not working

I recorded wav file on my samsung galaxy s2 . use auto call recorder . setting was ( audio source : voice downlink).
but when I try to play it, it’s not wok . i open it in audacity 2.0.3 . but I coudn’t see the blue waves and no sound , while the file is 157 Mb .

Appreciate your assitance.

You may be able to open the sound file if you install the FFMpeg software into Audacity. FFMpeg allows Audacity to recognize and open many more sound formats than Audacity alone.


What kind of sound file does the software say it produces?



I installed the FFMpeg software into Audacity as exlained. but it is not work … I export it as (*.mp3 ) but also it is not work … but I could see small green line in the output level bar.

the software produce *.wav files

the info for the file is :

16 bit
44100 hz

thanks for your help.

When you import the file, do File > Import > Audio… and make sure you choose “FFmpeg-compatible files” before importing the file.

What does the waveform look like - is it a flat line or almost so? Is the file the correct length?

If the file is the correct length, you could try clicking in the Track Control Panel on the left to select all the track, then choose Effect > Amplify then click OK. Can you see or hear the file now?

If the file still gives problems, download MediaInfo from http://mediainfo.sourceforge.net/en/Download/Windows (get the version without installer) . Open the file in MediaInfo, press View > Text then copy the information and paste it in here.


I imorted the file with choosing FFmpg-compatible files… but it is not work

the wave form is look like a flat line
I record new file with short duration and here is the file info from media info :

Complete name : C:UsersNabilDesktoptestNew foldercall_11-10-56_IN_22252187.wav
Format : Wave
File size : 1.30 MiB
Duration : 15s 480ms
Overall bit rate mode : Constant
Overall bit rate : 706 Kbps

Format : PCM
Format settings, Endianness : Little
Format settings, Sign : Signed
Codec ID : 1
Duration : 15s 480ms
Bit rate mode : Constant
Bit rate : 705.6 Kbps
Channel(s) : 1 channel
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 1.30 MiB (100%)

I’m using windows 7 home basic

thanks in advance for your help.

You appear to have a perfectly valid WAV format recording of silence.
I’d guess that the problem is with the “auto call recorder”. I presume that the recording plays as silence in any other program?

yes … this is true . … … it’s plays as silence in any other program …

but any other solution to get the voice … this is very important for me .


Just backtracking a bit. You wrote:

“I recorded wav file on my samsung galaxy s2 . use auto call recorder”

Did that work? Do you have a recording on your 'phone that plays back on your 'phone?

yes there is … there are *. amr , 3gp and wav

all this ( even wav ) are work fine except when change setting to voice downlink or mic from the audio source setting.

For mic it’s silience although the file have a size ( on PC or mobile )
for voice downlink I can hear the comming voice but I can’t hear my voice. ( on PC or mobile )

but when choose voice up link it work fine . ( on PC or mobile )


Are you talking about Audacity settings or settings in your 'phone software?

As I understand it the Android terminology is that the downlink side of a call is the voice of the other party only, the uplink side of a call is the phone’s user only, and if you record “Voice Call” you should record both sides of the call.

So if you are recording downlink you are not supposed to hear your own voice.

If you are giving Audacity a valid file that is silent or nearly silent and it shows the correct length of audio, that is all you can expect of Audacity.

For help recording on your Galaxy I suggest you ask here:
http://samsunggalaxysforums.com/ .