[FFmpeg-user] Recording logitech ultra vison,

[Lou]

On Tue, 07 Jun 2011 19:27:28 +0100
"Sw at g" <sweetthdevil at gmail.com> wrote:

> well it did, now the command ffmpeg -f video4linux2 -i /dev/video0 
> -pix_fmt yuv420p -s 800x600 -vcodec libx264 -preset medium -profile
> high -crf 18 -r 15 -t 20 cam_`date +%F_%T`.avi

You should use something other than avi for your output (such as mkv or
mp4) if you're going to use libx264. If you require avi, then don't use
b-frames.

-pix_fmt yuv420p and -profile high are probably redundant. Consider
adding -threads 0.

> works, but I cannot open it, I suspect is because x264-git isn't link 
> and gnome-mplayer doesn't see the codec.

Either compile MPlayer, or remove x264-git and ffmpeg-git and use the
versions from the repository. Your command would work with the
repository packages.

> regards,
> 
> On 06/07/2011 07:24 PM, Lou wrote:
> > On Tue, 07 Jun 2011 19:07:10 +0100
> > "Sw at g"<sweetthdevil at gmail.com>  wrote:
> >
> >> Right,
> >>
> >> me again, installing ffmpeg-git from aur didn't change any
> >> outcome, I
> > What outcome? You didn't show your command and the complete output.
> >
> >> am now recompiling the latest git with  ./configure --enable-gpl
> >> --enable-libx264 --enable-x11g is there any other option I should
> >> add?
> > ffmpeg-git and ffmpeg from the repository already use these options.
> > Re-compiling probably won't help you.
> >
> >> regards,
> >>
> >> On 06/07/2011 06:50 PM, Sw at g wrote:
> >>> Many thanks for your replies,
> >>>
> >>> I am now installing x264 and ffmpeg from aur, will let you know
> >>> the outcome
> >>>
> >>>
> >>> On 06/07/2011 06:39 PM, Etienne Buira wrote:
> >>>> On Tue, Jun 07, 2011 at 06:18:50PM +0100, Sw at g wrote:
> >>>>> Right,
> >>>>>
> >>>>> so I have compile the latest git to try resolving the issue and
> >>>>> now nothing work, for example the command I was using to record
> >>>>> my desktop return the following errors:
> >>>>>
> >>>>> [sweetth at myhost test]$ ffmpeg -s 2720x1024 -r 25 -f x11grab
> >>>>> -i :0.0 -acodec libmp3lame -ab 128k -vcodec mpeg4 -sameq -y -t
> >>>>> 60 /media/z/.cam/screen/screen_`date +%F_%T`.avi
> >>>>> ffmpeg version git-N-30610-g1929807, Copyright (c) 2000-2011 the
> >>>>> FFmpeg developers
> >>>>>      built on Jun  7 2011 18:01:52 with gcc 4.6.0 20110513
> >>>>> (prerelease) configuration:
> >>>>>      libavutil    51.  6. 1 / 51.  6. 1
> >>>>>      libavcodec   53.  6. 1 / 53.  6. 1
> >>>>>      libavformat  53.  2. 0 / 53.  2. 0
> >>>>>      libavdevice  53.  1. 1 / 53.  1. 1
> >>>>>      libavfilter   2. 14. 0 /  2. 14. 0
> >>>>>      libswscale    0. 14. 1 /  0. 14. 1
> >>>>> Unknown input format: 'x11grab'
> >>>> You need to give --enable-gpl --enable-x11grab to configure
> >>>> script.
> >>>>
> >>>>> and while trying to capture the webcam using the mpeg4 codec or
> >>>>> the libx264 then the terminal just hang:
> >>>>>
> >>>>> [sweetth at myhost test]$ ffmpeg -f video4linux2 -i /dev/video0 -b
> >>>>> 64m -crf
> >>>>> 22 -s 640x480 -vcodec mpeg4 -t 20  cam_`date +%F_%T`.mp4
> >>>>> ffmpeg version git-N-30610-g1929807, Copyright (c) 2000-2011 the
> >>>>> FFmpeg developers
> >>>>>      built on Jun  7 2011 18:01:52 with gcc 4.6.0 20110513
> >>>>> (prerelease) configuration:
> >>>>>      libavutil    51.  6. 1 / 51.  6. 1
> >>>>>      libavcodec   53.  6. 1 / 53.  6. 1
> >>>>>      libavformat  53.  2. 0 / 53.  2. 0
> >>>>>      libavdevice  53.  1. 1 / 53.  1. 1
> >>>>>      libavfilter   2. 14. 0 /  2. 14. 0
> >>>>>      libswscale    0. 14. 1 /  0. 14. 1
> >>>>> [video4linux2 @ 0xa75c360] The driver changed the time per frame
> >>>>> from 1228/32 to 1/5
> >>>> For that I don't know.
> >>>>
> >>>>> [sweetth at myhost test]$ ffmpeg -f video4linux2 -i /dev/video0
> >>>>> -pix_fmt yuv420p -s 800x600 -vcodec libx264 --preset medium -crf
> >>>>> 18 -r 15 -t 20 cam_`date +%F_%T`.mp4
> >>>>> ffmpeg version git-N-30610-g1929807, Copyright (c) 2000-2011 the
> >>>>> FFmpeg developers
> >>>>>      built on Jun  7 2011 18:01:52 with gcc 4.6.0 20110513
> >>>>> (prerelease) configuration:
> >>>>>      libavutil    51.  6. 1 / 51.  6. 1
> >>>>>      libavcodec   53.  6. 1 / 53.  6. 1
> >>>>>      libavformat  53.  2. 0 / 53.  2. 0
> >>>>>      libavdevice  53.  1. 1 / 53.  1. 1
> >>>>>      libavfilter   2. 14. 0 /  2. 14. 0
> >>>>>      libswscale    0. 14. 1 /  0. 14. 1
> >>>>> [video4linux2 @ 0x9287360] The driver changed the time per frame
> >>>>> from 1228/32 to 1/5
> >>>>>
> >>>>>
> >>>>> Any help would be appreciated,
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 06/07/2011 04:52 PM, Paul Gardiner wrote:
> >>>>>> On 07/06/2011 16:35, Sw at g wrote:
> >>>>>>> Hi again,
> >>>>>>>
> >>>>>>> Well with " " or ` ` it doesn't work "Unrecognized option
> >>>>>>> 'preset medium'" only the -vpre works.
> >>>>>> -vpre is a completely different thing. You definitely need
> >>>>>> -preset. If that's not accepted, then it has to be that you
> >>>>>> have a version of ffmpeg that is too old.
> >>>>>>
> >>>>>> -vpre is just a way to provoke long lists of ffmpeg paramaters
> >>>>>> stored in a preset file. It is -preset that communicates to
> >>>>>> libx264. There's never been a time when -vpre did what -preset
> >>>>>> does now, so it will not help to try using it.
> >>>> vpre was just a way to do the same thing as preset does now.