"MPEG-1/2 does not support 3/1 fps" when sending webcam to ffserver

I am unable to send a stream to my ffserver. I started the server with ffserver -f /etc/ffserver.conf & where ffserver.conf has not been modified. I tried sending a webcam stream with ffmpeg -f alsa -ac 2 -i plughw:0,0 -f video4linux2 -s vga -i /dev/video0 http://localhost:8090/feed1.ffm I have however the following error: [...] [tcp @ 0x560e1234c6e0] Connection to tcp://localhost:8090 failed (Connection refused), trying next address [...] MPEG-1/2 does not support 3/1 fps [...] The port 9080 is open, as seen with nmap localhost **Why do I have this error and how to send my stream?** ----------------------------- **Full output:** # ffmpeg -f alsa -ac 2 -i plughw:0,0 -f video4linux2 -s vga -i /dev/video0 http://localhost:8090/feed1.ffm ffmpeg version 3.2.1-1 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 6.2.1 (Debian 6.2.1-5) 20161124 configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-libtesseract --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-libopencv --enable-frei0r --enable-libx264 --enable-chromaprint --enable-shared libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libavresample 3. 1. 0 / 3. 1. 0 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 Guessed Channel Layout for Input Stream #0.0 : stereo Input #0, alsa, from 'plughw:0,0': Duration: N/A, start: 1481703954.356244, bitrate: 1536 kb/s Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Input #1, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 41830.241126, bitrate: 147456 kb/s Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc [tcp @ 0x560e6432c6e0] Connection to tcp://localhost:8090 failed (Connection refused), trying next address [tcp @ 0x560e64345a40] Connection to tcp://localhost:8090 failed (Connection refused), trying next address [mpeg1video @ 0x560e6435fb20] bitrate tolerance 21333 too small for bitrate 64000, overriding [mpeg1video @ 0x560e6435fb20] MPEG-1/2 does not support 3/1 fps Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp2 (native)) Stream #1:0 -> #0:1 (rawvideo (native) -> mpeg1video (native)) Stream #0:0 -> #0:2 (pcm_s16le (native) -> wmav2 (native)) Stream #1:0 -> #0:3 (rawvideo (native) -> msmpeg4v3 (msmpeg4)) Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height **Full /etc/ffserver.conf** (no modification from original file): HTTPPort 8090 HTTPBindAddress 0.0.0.0 MaxHTTPConnections 2000 MaxClients 1000 MaxBandwidth 1000 CustomLog - File /tmp/feed1.ffm FileMaxSize 200K ACL allow 127.0.0.1 Feed feed1.ffm Format mpeg AudioBitRate 32 AudioChannels 1 AudioSampleRate 44100 VideoBitRate 64 VideoBufferSize 40 VideoFrameRate 3 VideoSize 160x128 VideoGopSize 12 Feed feed1.ffm Format asf VideoFrameRate 15 VideoSize 352x240 VideoBitRate 256 VideoBufferSize 40 VideoGopSize 30 AudioBitRate 64 StartSendOnKey Format status ACL allow localhost ACL allow 192.168.0.0 192.168.255.255 URL http://www.ffmpeg.org/