[Ffmpeg-devel] Could not find video grab device

Martin van Es mrvanes
Fri Aug 26 19:53:42 CEST 2005

Hurray, I got ffmpeg to grab some stuff, so it's probably my
ffserver.conf and/or commandline that gets in the way:

The commandline I use is:
ffmpeg -vd /dev/video0 -ad /dev/dsp1 http://host:8090/webcam.ffm

On 'host' I have ffserver running with this configuration:

Port 8090
MaxClients 10
MaxBandwidth 1000
CustomLog -

# Suppress that if you want to launch ffserver as a daemon

<Feed webcam.ffm>
File /tmp/webcam.ffm
FileMaxSize 512K

# Only allow connections from localhost to the feed
#ACL allow

# ASF compatible

<Stream webcam.asf>
Feed webcam.ffm
Format asf
VideoFrameRate 10
VideoSize cif
VideoBitRate 128
VideoGopSize 30
VideoCodec msmpeg4v2
#VideoBufferSize 40
AudioCodec mp3
AudioBitRate 32
AudioChannels 1

This is the output I get (all local testing on 1 machine).
first ffserver:
minivanes:/usr/src/media/streaming/ffmpeg# ./ffserver
ffserver started. - - [Fri Aug 26 19:50:37 2005] "GET /webcam.ffm HTTP/1.0" 200 4165 - - [Fri Aug 26 19:50:37 2005] "GET /webcam.ffm HTTP/1.0" 200 4165 - - [Fri Aug 26 19:50:38 2005] "POST /webcam.ffm HTTP/1.0" 200 0

Then in another console ffmpeg:
minivanes:/usr/src/media/streaming/ffmpeg# ./ffmpeg -vd /dev/video0
-ad /dev/dsp1 http://localhost:8090/webcam.ffm
ffmpeg version CVS, build 3211266, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --prefix=/usr --enable-mp3lame
  built on Aug 26 2005 19:49:58, gcc: 4.0.1 (Debian 4.0.1-2)
Could not find video grab device

What am I overlooking or what option changed from 4.8.0 so that this
results in a 'Could not find video grab device' for what that's worth?


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