video queue mixer

Core Library Questions

johannesgj

in Core Library Questions • 7 months ago

hi there im trying to develop a videomixer working by the following:
its for an automatic poem generator (markov)

starts op - nothing playing but loaded same video into two movie objects
gets an message to queue an A->B period.
since nothing is playing it goes to A and plays until B where the message (A->B) is removed from the queue i guess.

while playing it gets a new message added to the queue and the mixer wants to fade from the current playing video to the next in queue when the first gets near its end (B)

so the functionality is like a first in first out however there is a transition between so i need two player objects overlapping in both start and end.

i also need the scenario where the queue is empty. no new objects (for a while at least)

my question is:
is there a general way to let a machine decide which player should play the next (song/video/etc) according to who is not busy?
is there anything general about my problem (can it be reearched and by what terms)
have anybody seen such a mixer? (basically an itunes autocrossfader for video hehe)
xan anybody help me out in which way to go?

ps. i have developed on this and come up ith 4 or 5 different drafts that not at all match my criteries so i think there is something central i dont get :-)

_____
allways on the lookout for new toys to mod
_____

Replies(4)

johannesgj

Re: video queue mixer

7 months ago

something like it is here i guess:
https://forum.processing.org/topic/gsvideo-chaining-videos

_____
allways on the lookout for new toys to mod
_____

johannesgj

Re: video queue mixer

7 months ago

here is my present mockup (bad fast draft)

/**
* Frames
* by Andres Colubri.
*
* Moves through the video one frame at the time by using the
* arrow keys. It estimates the frame counts using the framerate
* of the movie file, so it might not be exact in some cases.
*/

import processing.video.*;

Movie movi;

int newFrame = 0;
int movFrameRate = 30;
boolean show=true;

ArrayList<track> moviez;

void setup() {
size(640, 360);
background(0);
moviez= new ArrayList<track>();
// Load and set the video to play. Setting the video
// in play mode is needed so at least one frame is read
// and we can get duration, size and other information from
// the video stream.
movi = new Movie(this, "transit.mov");

// Pausing the video at the first frame.
movi.play();
movi.jump(0);
movi.pause();
moviez.add(new track(movi, 10, 200, 1));
moviez.add(new track(movi, 10, 200, 1));
moviez.add(new track(movi, 10, 200, 1));
moviez.add(new track(movi, 10, 200, 1));
moviez.add(new track(movi, 10, 200, 1));
      track t=moviez.get(0);
    t.start(true);
}

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

void draw() {
background(0);
for (int i=0;i<moviez.size()-1;i++) {
    track t=moviez.get(i);
    t.show();
}
show=true;
if (moviez.size()>1) {
    track t=moviez.get(1);
    track te=moviez.get(0);
    t.start(te.next());
}
else if (moviez.size()>0) {
    track t=moviez.get(0);
    if (t.die()) {
      moviez.remove(0);
      println("die");
    }
}

// background(0);
}

void keyPressed() {
track t=moviez.get(0);
t.start(true);
}

int getFrame(Movie mov) {
return ceil(mov.time() * 30) - 1;
}

class track {
int a, b, spor;
int opacity=0;
Movie mov;
track(Movie m, int aa, int bb, int ss) {
    mov=m;
    a=aa;
    b=bb;
    spor=ss;
    mov.play();
    mov.jump(a/30);
    mov.pause();
}
void start(boolean starter) {
    if (starter) {
      mov.play();
    }
}
boolean next() {
    boolean returner=false;
    if (getFrame(mov)<a+55) {
      opacity+=10;
    }
    else if (getFrame(mov)>b-55) {
      returner=true;
      opacity-=10;
    }
    return returner;
}
void show() {
    tint(255, opacity);
    image(mov, 0, 0, width, height);
    noTint();
}
boolean die() {
    if (getFrame(mov)>b) {
      return true;
    }
    return false;
}
}

_____
allways on the lookout for new toys to mod
_____

johannesgj

Re: video queue mixer

7 months ago

anyone?

_____
allways on the lookout for new toys to mod
_____

dreadeye

Re: video queue mixer

7 months ago

I'm in the process of adding this feature to a video mixer. I'm working with loops and speed control, so timing the crossfade depends on the sketch's frameRate and is never exact. If you were limited to normal speed videos and your computer could run the sketch at your video frame rate, it would just be a matter of subtracting the amount of time you want the fade to last from the duration of the clip and using this to trigger the next clip playing and an automated crossfade. Then you should be able to easily synch audio (my sketch is visuals only).

http://code.google.com/p/simple-cinema/

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