[Ffmpeg-devel] Could not find video grab device

Luca Abeni lucabe72
Fri Aug 26 13:00:51 CEST 2005


On Fri, 2005-08-26 at 12:30 +0200, Martin van Es wrote:
> Hi!
> I've noticed this question comming along more often here and there but
> failed to find a satisfying answer.
> ffmpeg-4.8.0 can find my webcam v4l(2) device and streams like a
> charm, but isn't
> exrtremely stable so I wanted to see what CVS could bring me but
> unfortunately recent ffmpeg CVS exits with 'Could not find video grab
> device'.
Did you try something like "-vd /dev/..."? Maybe posting the whole error
log would help... :)

> Also, 4.8.0 will no longer compile with GCC 4.01
> Is work being done on the v4l grab code? Is it so broken that noone
> wants to touch it anymore (it seems to be broken a long time ago).
I am using it right now, and it works quite well:
root at host3:/tmp# /usr/local/bin/ffmpeg -target dvd /tmp/blah.vob
ffmpeg version 0.4.9-pre1, build 4757, Copyright (c) 2000-2004 Fabrice
  configuration:  --enable-faac --disable-network --disable-zlib
--disable-vhook --disable-ffplay --extra-cflags=-I /tmp/aac/include
--extra-ldflags=-L /tmp/aac/lib 
  built on Jun 29 2005 10:11:28, gcc: 3.3.4
Assuming PAL for target.
Input #0, video4linux, from '':
  Duration: N/A, bitrate: N/A
  Stream #0.0: Video: rawvideo, yuv420p, 720x576, 25.00 fps
Input #1, audio_device, from '':
  Duration: N/A, bitrate: N/A
  Stream #1.0: Audio: pcm_s16le, 48000 Hz, mono, 768 kb/s
Output #0, dvd, to '/tmp/blah.vob':
  Stream #0.0: Video: mpeg2video, yuv420p, 720x576, 25.00 fps, q=2-31,
6000 kb/s
  Stream #0.1: Audio: ac3, 48000 Hz, mono, 448 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #1.0 -> #0.1
Press [q] to stop encoding

Which kind of problems are you seeing in the v4l code?

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