libv4lconvert: warning more framesizes then I can handle! about webcam-capture HOT 7 CLOSED

Hi,

For now there is no way to set requested FPS, but there is such argument in native code, so I will try to expose it somehow.

In terms of the message you are getting. I found this comment:

Problem
$ ./my_webcam_program
libv4lconvert: warning more framesizes then I can handle!
Solution
Install v4l version 0.8.4 or later, and then run sudo ldconfig. Rerun your program; the message should go away. Note: I don’t really know in what version of v4l this was fixed, but I do know that it is fixed in version 0.8.4.

Not sure if it's related to FPS.

from webcam-capture.

Hi,

I dig a little in a code and found that rate (FPS) argument which is being passed to native code is never used there, so it means that FPS rate is a number of consecutive getImage() calls per second.

from webcam-capture.

@decebals

I'm not sure if this is the root cause, since I'm not a v4l2 guru, but from the code I've googled, it seams like your webcam supports more resolutions than libv4lconvert can handle.

http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/lib/libv4lconvert/libv4lconvert.c

if (data->no_framesizes == V4LCONVERT_MAX_FRAMESIZES) {
  fprintf(stderr, "libv4lconvert: warning more framesizes then I can handle!\n");
  return;
}

http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/lib/libv4lconvert/libv4lconvert-priv.h

#define V4LCONVERT_MAX_FRAMESIZES 256

As you can see, in HEAD version value of V4LCONVERT_MAX_FRAMESIZES is set to 256, but in old releases it was 16. I can only assume that it's enough to update the package and it should work fine.

from webcam-capture.

Please reopen if this is not the case.

from webcam-capture.

i use the ScheduledThreadpool to handle the fps,and expose the data with an listener

from webcam-capture.

Is that mean that you also observed the same issue?

from webcam-capture.

@sarxos no ,i read the native code,it's set to 30,and i just use that to simplify my code.
but i have seen that warnning message before,

from webcam-capture.