OutOfMemoryError Occurs When Converting Slides to Images in Java

zhanghanjiang · April 10, 2025, 4:49am

【版本】aspose-slides-25.3-android.via.java.jar
【使用代码如下】

val presentation = Presentation(fileTest)
totalCount = presentation.slides.size()
val size = Size(requireWidth, requireHeight)
val parseProgressParams = IParseCallback.ParseProgressParams()
for (slideIndex in 0 until totalCount) {
    val slide = presentation.slides.get_Item(slideIndex)
    val bitmap = slide.getImage(size)
    parseProgressParams.slideIndex = slideIndex
    parseProgressParams.totalCount = totalCount
    val  outputStream = ByteArrayOutputStream()
    bitmap?.save(outputStream,5)
//                    parseProgressParams.bitmap = convertToBitmap(outputStream)
    parseProgressParams.bitmapOutputStream = outputStream
    callback?.onParseProgress(parseProgressParams)
}

额外尝试：
情况1：当fileTest是：整机命名和升级分享 (1).pptx - Google Slides
当requireWidth=1536 requireHeight=864 程序无异常
当 requireWidth=2688 requireHeight=1512 不管任何机器解析第4页时，得到以下错误。

java.lang.OutOfMemoryError: Failed to allocate a 33554448 byte allocation with 18742992 free bytes and 17MB until OOM, target footprint 268435456, growth limit 268435456
at com.aspose.slides.internal.wt.lj.setCapacity(Unknown Source:24)
at com.aspose.slides.internal.wt.lj.b(Unknown Source:8)
at com.aspose.slides.internal.wt.lj.write(Unknown Source:25)
at com.aspose.slides.internal.k2.mo.write(Unknown Source:2)
at android.graphics.Bitmap.nativeCompress(Native Method)
at android.graphics.Bitmap.compress(Bitmap.java:1539)
at com.aspose.slides.internal.v7.x4.x4(Unknown Source:81)
at com.aspose.slides.internal.b7.x4.x4(Unknown Source:20)
at com.aspose.slides.internal.b7.x4.rf(Unknown Source:8)
at com.aspose.slides.internal.b7.x4.rf(Unknown Source:54)
at com.aspose.slides.internal.b7.x4.x4(Unknown Source:69)
at com.aspose.slides.internal.uv.x4.x4(Unknown Source:62)
at com.aspose.slides.internal.uv.vj.x4(Unknown Source:25)
at com.aspose.slides.pmj.x4(Unknown Source:1570)
at com.aspose.slides.Picture.x4(Unknown Source:14)
at com.aspose.slides.slg.(Unknown Source:540)
at com.aspose.slides.slg.(Unknown Source:0)
at com.aspose.slides.wh.x4(Unknown Source:737)
at com.aspose.slides.wh.x4(Unknown Source:470)
at com.aspose.slides.vvy.x4(Unknown Source:197)
at com.aspose.slides.vvy.x4(Unknown Source:484)
at com.aspose.slides.q6n.x4(Unknown Source:4)
at com.aspose.slides.ot.mo(Unknown Source:156)
at com.aspose.slides.ot.x4(Unknown Source:14)
at com.aspose.slides.dxm.mo(Unknown Source:10)
at com.aspose.slides.dxm.x4(Unknown Source:262)
at com.aspose.slides.dxm.x4(Unknown Source:132)
at com.aspose.slides.dxm.x4(Unknown Source:37)
at com.aspose.slides.Slide.x4(Unknown Source:8)
at com.aspose.slides.Slide.rf(Unknown Source:6)
at com.aspose.slides.Slide.getImage(Unknown Source:4)

情况2：当fileTest是：【培训课件】背光模组与液晶基础知识.pptx - Google Slides
不管：requireWidth=1536 requireHeight=864 还是requireWidth=2688 requireHeight=1512
解析第14页时，得到以下错误。这个错误目前只有在一款机型上出现。

Caused by: java.lang.OutOfMemoryError: Failed to allocate a 3995456 byte allocation with 3055312 free bytes and 2983KB until OOM, target footprint 268435456, growth limit 268435456
at com.aspose.slides.internal.wt.lj.toArray(Unknown Source:5)
at com.aspose.slides.pmj.x4(Unknown Source:1573)
at com.aspose.slides.Picture.x4(Unknown Source:14)
at com.aspose.slides.slg.(Unknown Source:540)
at com.aspose.slides.slg.(Unknown Source:0)
at com.aspose.slides.wh.x4(Unknown Source:737)
at com.aspose.slides.wh.x4(Unknown Source:470)
at com.aspose.slides.vvy.x4(Unknown Source:197)
at com.aspose.slides.vvy.x4(Unknown Source:484)
at com.aspose.slides.q6n.x4(Unknown Source:4)
at com.aspose.slides.ot.mo(Unknown Source:156)
at com.aspose.slides.ot.x4(Unknown Source:14)
at com.aspose.slides.dxm.mo(Unknown Source:10)
at com.aspose.slides.dxm.x4(Unknown Source:262)
at com.aspose.slides.dxm.x4(Unknown Source:132)
at com.aspose.slides.dxm.x4(Unknown Source:37)
at com.aspose.slides.Slide.x4(Unknown Source:8)
at com.aspose.slides.Slide.rf(Unknown Source:6)
at com.aspose.slides.Slide.getImage(Unknown Source:4)

Professionalize.Discourse · April 10, 2025, 4:50am

@zhanghanjiang

It seems you are encountering an OutOfMemoryError when trying to convert certain slides from a PowerPoint presentation to images using Aspose.Slides. This issue typically arises when the requested image dimensions are too large for the available memory, especially on devices with limited resources.

Here are a few suggestions to help you resolve this issue:

Reduce Image Size: Since you mentioned that the error occurs when using larger dimensions (e.g., requireWidth=2688 and requireHeight=1512), try reducing the dimensions to see if that resolves the issue. For example, using requireWidth=1536 and requireHeight=864 seems to work without errors.
Optimize Memory Usage: Ensure that your application is optimized for memory usage. You can try to:
- Release any unused resources or objects.
- Use smaller images or lower quality settings if high resolution is not necessary.
Check for Large Content: The specific slides that cause the error may contain large images or complex graphics. If possible, inspect those slides and consider simplifying them or breaking them into smaller parts.
Use a Different Format: If TIFF is not a strict requirement, consider saving the slides in a different format that may consume less memory, such as PNG or JPEG.
Test on Different Devices: Since you mentioned that the error occurs on a specific device, try running the same code on different devices or emulators to see if the issue persists.

Here is a sample code snippet that demonstrates how to convert a slide to an image with specified dimensions:

import com.aspose.slides.Presentation;
import com.aspose.slides.SaveFormat;
import com.aspose.slides.TiffOptions;

public class ConvertSlideToImage {
    public static void main(String[] args) throws Exception {
        // Load the presentation
        Presentation presentation = new Presentation("path/to/presentation.pptx");

        // Set image options
        TiffOptions options = new TiffOptions();
        options.setImageSize(new Dimension(1536, 864)); // Adjust dimensions as needed

        // Save the slide as an image
        presentation.save("output_image.tiff", SaveFormat.Tiff, options);
        System.out.println("Slide converted to image successfully.");
    }
}

By following these suggestions, you should be able to mitigate the memory issues you are experiencing. If the problem persists, consider reaching out to Aspose support for further assistance.