This is what I use for v4l webcams - which maybe be identical to your
video capture card:
* Finding webcam (part of v4l-utils package) :
v4l2-ctl --list-devices
Integrated Camera (usb-0000:00:14.0-8):
/dev/video0
* list formats available for the device:
ffmpeg -f v4l2 -list_formats all -i /dev/video0
[video4linux2,v4l2 @ 0xcc7740] Raw : yuyv422 : YUV 4:2:2
(YUYV) : 640x480 320x180 320x240 352x288 424x240 640x360 848x480
960x540 1280x720
[video4linux2,v4l2 @ 0xcc7740] Compressed: mjpeg :
MJPEG : 640x480 320x180 320x240 352x288 424x240 640x360 848x480
960x540 1280x720
* play the video:
mplayer tv:// -tv driver=v4l2:width=640:height=480
* capturing the video:
ffmpeg -f v4l2 -framerate 25 -video_size 640x480 -i /dev/video0
video.mkv
* playing captured video:
mplayer video.mkv
Hope this helps you some way, Tomas
On Sat, 2016-12-17 at 00:02 -0800, Erik Lane wrote:
> On Fri, Dec 16, 2016 at 7:54 PM, King Beowulf <[email protected]>
> wrote:
>
> > On Thu, Dec 15, 2016 at 08:25 Erik Lane <[email protected]> wrote:
> >
> > [snip...]
> > >
> > >
> > >
> > No one is an expert until you ask questions and fiddle around...
> >
> > I haven't used tvtime so not sure of the underlying caoture
> > libraries.
> >
> > I would try ffmpeg. mplayer/mencoder can be cranky unless the
> > video format
> > is absolutely correct - also depends how you distro compiled the
> > package.
> >
> > ffmpeg is more flexible and gives lots of feedback on the CLI. If
> > the
> > capture card runs via v4l2 it should work.
> >
>
> >
> Thanks for the suggestion! I wasn't aware that ffmpeg would take
> input
> straight from a card, but I guess it makes sense. This box is
> reasonably
> powerful, with 4 cores, but I'm a little worried that transcoding
> would
> cause it to miss a frame here or there. I really don't know what kind
> of
> power it might take to handle the stream. I know that ffmpeg has a
> command
> to simply copy the input to the output with a wrapper around it for
> some
> formats at least, so I'll have to see what it can do with a raw
> stream. I
> see an example of a simple command to save the input as 'cat
> /dev/video0 >
> filename.ts' and if that works then I might do ffmpeg afterwards to
> turn it
> into mp4. Though if ffmpeg can save straight to .ts with raw data,
> that
> will be another thing I can try.
>
> To give added info, since my last post I found out VLC could record
> from a
> capture card, as well as stream from one. When I tried it the
> recording
> worked well for a while, but ended up with errors in the video file
> that
> spit out errors on the command line of missing timestamps and the
> audio
> went AWOL somewhere in there. (I started VLC from the command line to
> easily see the errors.) It actually worked well for about half an
> hour each
> time before failing, so I suspect that it might be running out of
> memory. I
> have no evidence for that, though. The streaming option looked like
> everything was good from the GUI, but the command line spit out some
> errors
> about missing files, and the video never got sent to a file that I
> could
> find. Of course I tried many times with different options and
> different
> file names in different directories.
>
> I also wiped out the box and started over with mythbuntu, thinking an
> all
> in one solution would 'just work' and then I could get this done. It
> failed. It found the card, but then when I got to a screen where it
> was
> going to scan for channels, it couldn't initialize the card. I tried
> for
> hours with every variation I could come up with, but no luck.
>
> I'll try a bit more in the morning before reinstalling my old system
> and
> then seeing if the simple cat or ffmpeg will grab it. I only need to
> save
> about 10 old VHS tapes from being lost to history, so manual
> processes are
> perfectly acceptable. Once I'm done with this, fingers crossed I
> won't need
> to do something like this again. (Well, until the next friend comes
> up with
> an old irreplaceable tape or whatever.) :)
>
> Thanks for the suggestions!
> Erik
> _______________________________________________
> PLUG mailing list
> [email protected]
> http://lists.pdxlinux.org/mailman/listinfo/plug
_______________________________________________
PLUG mailing list
[email protected]
http://lists.pdxlinux.org/mailman/listinfo/plug
