OPENCV Read Movie()

gandalf

in Contributed Library Questions • 2 years ago

Hi All,

Im a trying to read a movie with openCV and then make some editing with it. Unfortunately it seems openCV can't find the movie...I tried to put it either in the data folder as usual or the main folder but it doesn work.

I get the followig message : The movie file 'movie.avi' can not be found in folders, you must specify the full path instead.

What does it mean the full path? I tried also to write a path like c:\... but again it not working?

Does anybody have a clue why this happens?

size( 320, 240 );
opencv = new OpenCV( this );
opencv.movie( "movie.avi", width, height ); // load movie file

Replies(19)

cedrickie..

Re: OPENCV Read Movie()

2 years ago

try to write down the absolut path. something like

opencv.movie( C:/Processing/Processing Sketches/AnimationSketch/movie.avi", width, height ); // load movie file

gandalf

Re: OPENCV Read Movie()

2 years ago

Thanks for your reply.

Now I wrote

void setup() {
size( 320, 240);
opencv = new OpenCV( this );
opencv.movie( "C:\processing-1.2.1\Processing Sketches\AnimationSketch\gc_dk_Produce_0.mov", width, height ); // load movie file

But I got the following error: unxpected char 'p' .

cedrickie..

Re: OPENCV Read Movie()

2 years ago

try to write

opencv.movie( "C:/processing-1.2.1/Processing Sketches/AnimationSketch/gc_dk_Produce_0.mov", width, height );

instead

gandalf

Re: OPENCV Read Movie()

2 years ago

ok changed again. It still cannot find the movie : The movie file 'movie.avi' can not be found in folders, you must specify the full path instead.

PhiLho

Re: OPENCV Read Movie()

2 years ago

Backslashes have a special meaning in Java strings, that's why it is better to just use forward slashes as path separators, they work well in Windows too.
Double check your path, and if it still doesn't work, try a path without spaces.

cedrickie..

Re: OPENCV Read Movie()

2 years ago

to make it easier, just put the movie at c:/movie.mov and see if it works

gandalf

Re: OPENCV Read Movie()

2 years ago

Still the same...

getting crazy!

Does it work with you? Do you have OpenCV?

cedrickie..

Re: OPENCV Read Movie()

2 years ago

can you quickly copy&paste me the code. i wanna test it myself.

gandalf

Re: OPENCV Read Movie()

2 years ago

code is taken from openCV lib reference http://ubaa.net/shared/processing/opencv/opencv_movie.html

import.hympermedia.video.*;
OpenCV opencv;
void setup() {
size( 640, 480 );
opencv = new OpenCV( this );
opencv.movie( "bunny.avi", width, height ); // load movie file
}
void draw() {
opencv.read(); // read a new frame
image( opencv.image(), 0, 0 ); // and display image
}
void mousePressed() {
float time = mouseX/float(width);
opencv.jump( time ); // jump to a specified frame
}

gandalf

Re: OPENCV Read Movie()

2 years ago

any news guys?

cedrickie..

Re: OPENCV Read Movie()

2 years ago

to be honest, i tested it and couldnt make it work either. philho, any idea ?

gandalf

Re: OPENCV Read Movie()

2 years ago

mhh very strange anyone has ever used openCV so that can give some insights?

Do you if I can pass a video to openCV functions/methods in another way?

PhiLho

Re: OPENCV Read Movie()

2 years ago

Well, I was a bit curious about this OpenCV that comes up regularly on the forum.
So I went to their page and tried to follow the instructions: went to the page they link to to download the OpenCV itself, and downloaded the .exe file I saw on this page (not trying to think too much...), and installed it. Then I downloaded the library and unzipped it to my libraries folder.
I got an error many people reported already, problem of find a DLL.
Double checked the forum, people remember we have to download the 1.0 version, as stated in the library page. Went back to the linked page, the exe I downlaoded was the latest version (2.2). I had to navigate up to find the old (2007!) version.
Uninstalled the new version (I prefer to avoid conflicts), installed the new one.
Ran Processing, pasted the above code (fixing the incorrect import statement), pasted a path to some AVI file I have (in a path with spaces), fixed the slashes.
Ran the sketch: I can see the video. For some reason, it has black squares over the image, and it goes way too fast (64 frames for a 30s video!), but I can see the movie.
Windows 7 64bit, Java 1.6.0_21 (32bit), Processing 1.2.1 and 0191.

gandalf

Re: OPENCV Read Movie()

2 years ago

I might have found the problem in the end:

1) prior to play sketch it works only if sketch has been saved (didnt know this)

2) OpenCV on windows works only with AVI while I was using a MOV.

probably a bit out of topic but do you know a quick and cheap way to convert MOV to AVI?

cedrickie..

Re: OPENCV Read Movie()

2 years ago

alright, you have to save it first. i didnt do that either...

if you want to convert files quickly without downloading and installing any software i recommend some online converters like http://www.zamzar.com/

PhiLho

Re: OPENCV Read Movie()

2 years ago

Otherwise, I just tried with a random .mov I had:
ffmpeg -i snail40.mov -vcodec libxvid snail.avi
and OpenCV displayed it OK.
FFMPEG is a well known video converter. If you don't like command line, SUPER is quite well known too.

gandalf

Re: Re: OPENCV Read Movie()

2 years ago

Hi phi.lho,

I think the line:

ffmpeg -i snail40.mov -vcodec libxvid snail.avi

is out of my comprehension! What does it mean?

PhiLho

Re: OPENCV Read Movie()

2 years ago

See the information two lines below...

OK, I even save you a Google search: http://ffmpeg.org/

gandalf

Re: OPENCV Read Movie()

2 years ago

Oh thank you...

I didnt know ffmpeg is a command line tool to convert multimedia files between formats! I will look into it

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