Wolfson Audio Stream with FFMPEG help

Hi,

I also struggled many hours with such a thing, without success. Here is what I understood so far (Please anyone feel free to correct me if I made mistakes) :

- ffmpeg is deprecated and avconv should be used (same features, same parameters)

- I also tried with gstreamer

- raspivid stream may not be synced with audio as the h264 format used is not timestamped

Nicolas,

I was able to get FFMPEG stream A/V but you are correct. The more I researched it there is no timestamp so FFMPEG can not do the sync. Due to the necessity of encoding the audio it becomes delayed from the h.264 video and is never in sync.

I still have no solution for this. My hope is that someone smarter than me will answer this.

David

David,

I would really be interested in knowing how you got this working, since I still had no chance to make it work on my side. Could you provide me with the command line ? It may also help other users in this situation.

Thanks;

Nicolas

Here is the bash script I'm using. When I start my RPi it goes right into this and streams directly to my public streaming server (Wowza). I did spend the time to compile FFMPEG.  I have an image of this but I'm not sure I want to put it out on a public link from my server.

I run a live streaming company specializing in Wowza. One of my sites is http://worshipmedia.tv and I could really use a solution like this for my company.  Right now I use IP cameras and that works well but it would be nice to brand my own solution if I could.

#!
clear

#---------------------------------------------------------------------------
# Audio/Video stream
mkfifo temp.v
raspivid -t 0 -w 360 -h 202 -fps 12 -g 60 -vf -hf -b 200000 -v -o temp.v & \
arecord -f S32_LE -c 2 -r 44100 -D plughw:0,0 -B 0.1 | \
ffmpeg \
    -i temp.v \
    -i - \
    -ab 32k \
    -ac 2 \
    -strict -2 \
    -c:v copy \
    -c:a aac \
    -report \
    -vsync 2 \
    -async 1 \
    -f flv -metadata streamName=myStream rtmp://[yourserverdomain]/live/myStream



#---------------------------------------------------------------------------
# Audio only stream
#arecord -f S32_LE -c 2 -r 44100 -D plughw:0,0 | \
#ffmpeg -i pipe:0 \
    #-acodec aac \
    #-ab 32k \
    #-ac 2 \
    #-strict -2 \
    #-f flv -metadata streamName=myStream rtmp://[yourserverdomain]/live/myStream




#---------------------------------------------------------------------------
# Video only stream
#raspivid -t 0 -w 720 -h 405 -fps 25 -vf -b 500000 -o - | \
#ffmpeg -i pipe:0 -c:v copy -f flv -metadata streamName=myStream rtmp://[yourserverdomain]/live/myStream

Thanks for your help.

Unfortunately, I am not able to make it work. I tried your command lines, but I guess I need an rtmp server. I also tried to save the file as a mp4 or mkv file with no success : I do have audio, VLC detects a video track, but it is always black.

Any Idea ?