ted morris wrote:
Greetings,
I would like to capture video w/o having to reset the card(s) with
awtv,tvtime, etc.,etc.
through X.
It can be done with mencoder so I am assuming there must be some 'trick'
to doing
it with transcoder. As claimed by a student over here the mencoder
command looks
like this:
mencoder -ffourcc XVID -oac lavc -ovc lavc -lavcopts
vcodec=mpeg4:mv0:trell:v4mv:vbitrate=3000:ildct:aspect=16/9:acodec=mp2
-tv driver=v4l2:norm=ntsc:input=2:adevice=/dev/dsp:width=720:height=480
-o /videos/test.avi tv://
Here is a command I have been using for quite a while which captures
perfectly the
way I want but still requires starting x, running tvtime (for example),
then closing x:
I used a very similar transcode command a couple of years ago for
realtime compression of TV feeds.
I compiled a very small utility called v4lfreq. I didn't write it, but
I've attached the source (v4lfreq.c) to this mail so you can give it a try.
Other parameters than the frequency (tv mode, PAL/NTSC, etc) can be set
with the command-line tool v4l-conf (I think that's the name anyway,
it's been a while).
Hope it works for you. Don't give up, I've done it for years, so it's
definitely possible.
--
Med venlig hilsen
Christian Iversen
/* channelchanger.c 2002/08/21
*
* Bill Eldridge, Radio Free Asia, 2002, GPL (see www.gnu.org)
* http://techweb.rfa.org/staff/bill
* b...@rfa.org
*
* Very simple program to change channels (well, "frequencies")
* on a video device.
*
* Requires the device not be in use or that it be v4l2
*
* Has NOT been tested well. Use at your own risk.
* Specifically, you might want to mute audio between
* changes, etc.
*
*/
#ifndef CONFIG_WIN32
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <termios.h>
#include <sys/resource.h>
#endif
#ifdef __BEOS__
#include <OS.h>
#endif
#include <time.h>
#include <ctype.h>
#include <string.h>
#include <stdio.h>
#include <linux/videodev.h>
#include <stdlib.h>
int video_fd;
int ret;
char v4l_device[40];
unsigned long new_freq;
int main(int argc,char *argv[]) {
if (argc > 2)
strcpy(v4l_device,argv[2]);
else
strcpy(v4l_device,"/dev/video0");
printf("v4l_device: %s\n",v4l_device);
if (argc > 1) {
new_freq=(unsigned long)(atof(argv[1])*16.);
}
else {
printf("Usage: channelchanger <frequency> [videodev]\n;");
exit(-1);
//new_freq=196.250*16.;
}
video_fd = open(v4l_device, O_TRUNC); //Same as O_NOIO
if (video_fd < 0) {
perror(v4l_device);
printf("Error: %d\n",video_fd);
exit(-1);
}
printf("new_freq: %6.3lf\n",(double)new_freq/16);
ret = ioctl(video_fd, VIDIOCSFREQ, &new_freq);
printf("Result: %d\n",ret);
return(ret);
}
