OutOfMemoryError when compressing with GZipOutputStream

[Ken DeLong]

I'm saving a large amount of data (a video stream: frames of
byte[640*480], 10 fps) to a file. I'm doing it like this:

FileOutputStream fos = new FileOutputStream(fileName);
BufferedOutputStream bos = new BufferedOutputStream(fos);
GZipOutputStream gos = new GZipOutputStream(bos);
ObjectOutputStream oos = new ObjectOutputStream(gos);

.. . .

// on each new frame
oos.writeObject(frame);


This works well with a small number of frames. However, after about
100 frames I get an OutOfMemoryException. I've tried oos.flush()
every 10 frames but it doesn't help.

How can I avoid the memory overflow?

 

[Boudewijn Dijkstra]

I'm saving a large amount of data (a video stream: frames of
byte[640*480], 10 fps) to a file. I'm doing it like this:

FileOutputStream fos = new FileOutputStream(fileName);
BufferedOutputStream bos = new BufferedOutputStream(fos);
GZipOutputStream gos = new GZipOutputStream(bos);
ObjectOutputStream oos = new ObjectOutputStream(gos);

. . .

// on each new frame
oos.writeObject(frame);


This works well with a small number of frames. However, after about
100 frames I get an OutOfMemoryException. I've tried oos.flush()
every 10 frames but it doesn't help.

How can I avoid the memory overflow?

Where are the frames coming from?
Why do you use an ObjectStream when you can directly write byte arrays?

 

[Roedy Green]

Where are the frames coming from?
Why do you use an ObjectStream when you can directly write byte arrays?

the code is simpler. And the overhead is minimal for a large object
like that. Without it, you need to place your own length field.

For super speed, look into nio.