[FFmpeg-user] ffserver - send audio with filter complex as video

[Zoltan Kerenyi Nagy]

Hi Guys,

I'd like to send the audio with waveform overlay for both channels, I can
save it to file:
ffmpeg -f alsa -i hw:0,0 -filter_complex
"showwaves=split_channels=1:s=1280x720:mode=line:colors=Red|Blue" out.mp4

However with ffserver it fails:
ffmpeg -f alsa -i hw:0,0 -filter_complex
"showwaves=split_channels=1:s=1280x720:mode=line:colors=Red|Blue"
http://localhost:5554/video.ffm

OUTPUT:
Wed Jan 30 09:06:00 2019 127.0.0.1 - - New connection: GET /video.ffm
Missing video stream which is required by this ffm
Wed Jan 30 09:06:00 2019 127.0.0.1 - - [GET] "/video.ffm HTTP/1.1" 200 4175

Here is the config file:

HTTPPort 5554
HTTPBindAddress 0.0.0.0
MaxHTTPConnections 4
MaxClients 4
MaxBandwidth 1024
CustomLog -

<Feed video.ffm>
    File /tmp/video.ffm
    FileMaxSize 2048M
</Feed>

#####################

<Stream video>
    Format flv
    Feed video.ffm
    VideoCodec libx264
    VideoFrameRate 15
    VideoBitRate 512
    VideoSize 1280x720
    AVOptionVideo crf 23
    AVOptionVideo preset medium
    AVOptionVideo flags +global_header

    AudioCodec aac
    Strict -2
    AudioBitRate 128
    AudioChannels 2
    AudioSampleRate 44100
    AVOptionAudio flags +global_header
</Stream>

I'm sure that something is wrong with the ffserver config file.

Thanks,

Z