Higher the size() is, the faster the movieMaker export is?

sctv

Higher the size() is, the faster the movieMaker export is?

in Contributed Library Questions • 1 year ago

Hi all,

I'm basically recording footage while displaying other video. Everything works apart from one thing. The frame-rate of the recorded .mov file is way too fast. The recording time is 6 seconds, however the exported .mov file is 3 secs.

W hat it seems to be is the higher the size() is, the faster it'll play back.

It'll work normally at 200x200 pixels, but the exported video gets faster and faster the higher the resolution is.

Any ideas why?

import jmcvideo.*;
import processing.video.*;
import processing.serial.*;
Capture myCapture;
Serial arduino;
MovieMaker mm;
boolean video = false;
JMCMovie myMovie;
int counter = 1;
int vidCounter = 0;
void setup() {
size(1440, 900, P2D);
frameRate(25);
// size(320, 240, P2D);
mm = new MovieMaker(this, width, height, "drawing" + counter + ".mov",
25, MovieMaker.JPEG, MovieMaker.BEST);
myCapture = new Capture(this, width, height, 25);
myCapture.settings();
myMovie = movieFromDataPath("drawing0.mov");
myMovie.loop();
arduino = new Serial(this, Serial.list()[0], 9600);
background(0);
}
void draw() {
{
byte[] inBuffer = new byte[7];
while (arduino.available () > 0) {
inBuffer = arduino.readBytes();
arduino.readBytes(inBuffer);
if (inBuffer != null) {
String myString = new String(inBuffer);
println(myString);
delay(200);
// if (keyPressed) {
// if (key == ' ') {
if (myString.equals("A")) {
video = true;
arduino.clear();
}
else if (myString.equals("?")) {
video = false;
delay(200);
println("finished :)");
mm.finish();
background(0);
arduino.clear();
delay(200);
counter++;
delay(500);
mm = new MovieMaker(this, width, height, "drawing" + counter + ".mov",
25, MovieMaker.JPEG, MovieMaker.BEST);
}
}
}
}
if (video) {
image(myMovie, 0, 0);
myCapture.loadPixels();
mm.addFrame(myCapture.pixels, myCapture.width, myCapture.height);
}
}
void captureEvent(Capture myCapture) {
myCapture.read();
}
JMCMovie movieFromDataPath(String filename)
{
return new JMCMovie(this, filename, RGB);
}

Replies(4)

benja

Re: Higher the size() is, the faster the movieMaker export is?

1 year ago

It looks like you are saving input from a camera to a movie.
When you pick a high resolution, then this will decrease your framerate, because encoding a hd-video is usually pretty slow.

So when your framrate drops to 10 fps for example, then there are only 10 frames added to the video.
While your encoded video has a framerate of 25, it displays the recorded frames 2.5 faster, then they were recorded.

sctv

Re: Higher the size() is, the faster the movieMaker export is?

1 year ago

That makes a lot of sense - thanks Benja.

Is there anyway of getting around this?

benja

Re: Higher the size() is, the faster the movieMaker export is?

1 year ago

I'm not sure if there is a perfect solution to this, but the topic has been discussed frequently.
I never had to record movies in realtime, so i didn't test a lot.

But it seems like a good option is to save a tga-image-sequence and create the video manually.
Might have a look into this thread.