At the moment I'm setting up a screen-sharing platform with the opensource tool ffmpeg / ffserver. At the beginning of the sharing everything is fine. After around 1 1/2 minutes I get the following exception in the output.
[flv @ 0x3a47aa0] rc buffer underflow
[flv @ 0x3a47aa0] max bitrate possibly too small or try trellis with large lmax or increase qmax
I've tried to set an verry high lmax & qmax but this hasn't changed any thing.Additionally I've tried to increase the bitrate , the buffersize and the bitrate.
I use the following command with ffmpeg:
ffmpeg -f x11grab -s 1920x1080 -r 20 -i :0.0+1680,0 "http://localserver.de:8080/input1.ffm"
The config file for the ffserver is:
HTTPPort 8080
HTTPBindAddress 0.0.0.0
MaxHTTPConnections 2000
MaxClients 1000
MaxBandwidth 50000
CustomLog -
<Feed input1.ffm>
File /var/ffserver/input1.ffm
FileMaxSize 20M
ACL allow *FROM IP* *TO IP*
</Feed>
<Stream screen1.swf>
Feed input1.ffm
Format swf
VideoCodec flv
VideoFrameRate 20
VideoBufferSize 8000
VideoBitRate 250
VideoQMin 1
VideoQMax 5
VideoSize 640x400
PreRoll 0
StartSendOnKey
NoAudio
</Stream>
An other streaming format would also be a possibility but I didn't know which are possible for live-streaming.
