Hello, I would like to generate a movie of a series of plots using PLPlot and
mencoder on Linux without using intermediate JPG-files. I have made a
FIFO-file "file.mjpeg" using mkfifo. The following commands works to generate
a movie file if I start with a set of JPG-files.
mencoder file.mjpeg -demuxer lavf -lavfdopts format=mjpeg \
-ovc lavc -o test.avi
and then
cat *.jpg > file.mjpeg
So the question is if it is possible to make plplot behave exactly as "cat
*.jpg > file.mjpeg"? I have tried some different methods, using pgbop(),
pgeop(), pgclear() and pgadv(0), but seem to end up with a movie consisting
of only one frame. Is it possible to make plplot write individual JPG-files
to the file.mjpeg FIFO one after the other, just as the command "cat *.jpg >
file.mjpeg"? I tried using pleop(), plsfnam() and plbop() for each iteration
of the ploting, with the same filename every time, but then I got a
segmentation fault.
Here is one of the possibilities I tried (I ran it with the -np option):
#include <plplot/plplot.h>
#include <cmath>
using namespace std;
int main(int argc, char *argv[]) {
double x[2], y[2]; // Coordinates to plot
x[0] = 0; y[0] = 0; // These are fixed
x[1] = 1; y[1] = 0; // Starting position
plparseopts(&argc, argv, PL_PARSE_FULL);
plsdev("jpeg");
plsfnam("file.mjpeg");
plinit();
plenv(-1, 1, -1, 1, 1, -2);
plbox("bcinst", 0, 0, "bcinst", 0, 0);
plline(2, x, y);
for(int i = 1; i != 25; ++i) {
x[1] = cos(double(i)/25); y[1] = sin(double(i)/25);
pladv(0);
plbox("bcinst", 0, 0, "bcinst", 0, 0);
plline(2, x, y);
}
plend();
return(0);
}
Thanks,
Torquil Sørensen
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