[FFmpeg-user] mux flv problem

Soho Soho123 soho123.2012 at gmail.com
Mon Jul 15 13:51:27 CEST 2013

Hi All,

I use ffmpeg + ffserver to do a stream server.
the stream includes video + audio.
the config for ffserver :
<Stream test.flv>
Feed feed1.ffm
Format flv

AVOptionVideo flags +global_header
VideoSize 1280x720
VideoFrameRate 12
VideoCodec libx264
AVOptionAudio flags +global_header
AudioCodec pcm_s16le
AudioChannels 2
AudioSampleRate 48000
the command line of ffmpeg:
ffmpeg -loglevel debug -f alsa -ar 48000 -ac 2 -i hw:0 -f video4linux2 -r
30 -s 1280x720 -input_format h264 -i /dev/video1 -vcodec copy -acodec copy

then I got the error message:
FLV does not support sample rate 48000,choose from (44100, 22050, 11025)
it is output from :libavformat/flvenc.c, that used when ffserver do mux.

Hence, my question is ffserver related.
Does someone have idea about why flv can not support 48000 sample rate in

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