Get source frame rate or number of frames about processing-video HOT 7 CLOSED

Please use the Forum for questions: http://forum.processing.org. This place is for bug reports. FYI, there's an example that comes with the video library that covers this question.

from processing-video.

The Libraries->video->Movie->Frames example has the frame rate hard-coded and does not ever actually get the frame rate from the Movie class.

int movFrameRate = 30;

None of the other examples I saw get frame rate either. I've also looked through the source code for the Movie class, and the only relevant method I could find is marked protected:

protected float getSourceFrameRate() {…}

I've tried signing up in the forum, but am still waiting for the confirmation email. I can continue this discussion there if you prefer.

-Kris

On Dec 11, 2014, at 4:18 PM, Casey Reas [email protected] wrote:

Closed #19.

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from processing-video.

I'm not sure what issues, if any, getting the frame rate has. Maybe @codeanticode can let us know.

from processing-video.

The Movie class has a public field, frameRate, that contains the frame rate the video file is being played at. You can change the current frame rate with the frameRate(fps) method:

import processing.video.*;

Movie movie;

void setup() {
  size(640, 360);
  background(0);
  movie = new Movie(this, "transit.mov");
  movie.loop();  
}

void movieEvent(Movie m) {
  m.read();
}

void draw() {
  image(movie, 0, 0, width, height);
  println(movie.frameRate);
}

void keyPressed() {
  movie.frameRate(1);
}

@krismz let me know if this works for you. The Frames example should use of Movie.frameRate instead of the hard-coded value, thanks for pointing that out!

from processing-video.

@krismz did you try the code I posted in the previous comment?

from processing-video.

Yes, that worked for me, thanks! But it seems that frameRate is always the current playing frame rate of the movie which is only the same thing as the original frame rate prior to any sort of call to movie.frameRate(some_other_frame_rate). Is this true? If I want to skip to a specific frame in a movie, I need to jump based on the original source frame rate, not the current playing frame rate. I'm handling this now by saving off the value of movie.frameRate just after my first call to movie.read().

from processing-video.

@krismz thanks for the observation. The documentation is a bit ambiguous on this, since while it does describe the frameRate() function, it does not make any reference to the frameRate variable. My interpretation is that it should contain wherever was last set with frameRate(), which is consistent with the usage of the frameRate variable in PApplet.

@alignedleft @REAS do you have any comments? Should we add an entry for the frameRate variable in the video documentation? Should we start the original frame rate of the movie file somewhere?

from processing-video.