Tyson,
For fun, I wrote the following program.
Compile it using:
gcc timed_copy.c -o timed_copy
Use it like this:
timed_copy <input device> <output file> <time in seconds>
You can try it out with /dev/urandom like this:
timed_copy /dev/urandom ~/output.dat 5
That gets you 5 seconds of pseudo random numbers. Whee!
When you try this out on your PVR-150 you may want to increase
BUFFER_SIZE.
Also to make this more reliable, I would have put the write call in one
thread and the read call in another thread, increased the buffer size to
1 MB or more, and passed buffers between the two threads.
In that way most of the program's time would be spent blocked on the
read() and write() reducing the chance of a buffer overrun from the
video device.
Enjoy.
--R
On Wed, 2007-02-28 at 23:31 -0500, Rob Ludwick wrote:
> Tyson,
>
> There looks to be some useful information here:
>
> http://www.cs.duke.edu/~reynolds/pvr150/
>
> It's not completely straightforward and it looks a bit on the old side,
> but the information is mostly there..
>
> Apparently at ivtvdriver.org there's a command to tune your card to
> a channel called ivtv-tune. There's another called ivtvctl. They look
> useful
>
> Also apparently you just need to know which /dev device and pull the
> video off of it like this:
>
> cat /dev/video0 > /path/to/file.mpg
>
> It's my understanding that the output of ivtv driver is an mpeg
> stream.
>
> --Rob
>
>
> On Wed, 2007-02-28 at 20:48 -0500, Tyson Maxwell wrote:
> > All,
> >
> > I have a Hauppauge PVR-150 and I am looking for a simple framegrabber.
> > Eventually I may try and build a MythTV box, but for now I looking
> > for something simple and command-line based. Basically I just want to
> > issue a command to record a specific channel for a given duration. If
> > anyone knows of a good tool that will do this, please let me know.
> >
> > Thanks,
> > -Tyson
> >
> > _______________________________________________
> > Fwlug mailing list
> > [email protected]
> > http://fortwaynelug.org/mailman/listinfo/fwlug_fortwaynelug.org
>
>
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#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define BUFFER_SIZE 512
int main(int argc, char **argv) {
if ( argc != 4 ) {
fprintf(stderr, "%s: <input> <output> <time in seconds>\n ", argv[0]);
exit(1);
}
else
{
int secs;
char * buf;
secs = atoi(argv[3]);
int fd1, fd2;
struct timeval now, fin;
if (!secs)
{
fprintf(stderr, "%s: Can't process time \n",argv[0]);
exit(1);
}
buf = malloc(BUFFER_SIZE);
if (!buf)
{
fprintf(stderr, "%s: Can't malloc() %d bytes.\n",argv[0], BUFFER_SIZE);
exit(1);
}
fd1 = open(argv[1], O_RDONLY);
if (!fd1)
{
fprintf(stderr, "%s: Can't open %s for reading.\n",argv[0], argv[1]);
exit(1);
}
fd2 = open(argv[2], O_WRONLY | O_CREAT );
if (!fd2)
{
fprintf(stderr, "%s: Can't open %s for writing.\n",argv[0],argv[2]);
exit(1);
}
// Everything is sane so start running
gettimeofday(&fin, NULL);
fin.tv_sec += secs;
gettimeofday(&now, NULL);
while (timercmp(&now, &fin, <)) {
int sz = read(fd1, buf, BUFFER_SIZE);
if (sz < 0) {
fprintf(stderr, "%s: Error reading %s.\n",argv[0], argv[1]);
exit(1);
}
sz = write(fd2, buf, BUFFER_SIZE);
if (sz < 0 ) {
fprintf(stderr, "%s: Error writing %s.\n",argv[0], argv[2]);
exit(1);
}
gettimeofday(&now,NULL);
}
}
}
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