FFmpegFrameFilter problem when multi filters

[varlxj]

hello
this is what i want
ffplay test.mp4 -vf "drawbox=100:100:100:100:black@1,vflip"

the source video

right result

but when i use FFmpegFrameFilter， I can not get the same result

error result

FFmpegFrameFilter with sigle filter i can get correctly result, but when i use filterchain or filtergraph, the final result is always like this

this is my code:

FFmpegFrameFilter filter = new FFmpegFrameFilter("drawbox=100:100:100:100,vflip",  
 grabber.getImageWidth(), grabber.getImageHeight());  
filter.setFrameRate(grabber.getFrameRate());  
filter.start();  

while (true) {
    Frame frame = grabber.grabFrame();  
    if (frame == null) { 
        break;  
    } 

    if (frame.getTypes().contains(Frame.Type.VIDEO)) { 
        filter.push(frame); 
        frame = filter.pull(); 
    } 

    recorder.record(frame);  
} 

---

<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>opencv</artifactId>
    <version>4.1.0-1.5.1</version>
    <classifier>macosx-x86_64</classifier> 
</dependency> 
<dependency> 
    <groupId>org.bytedeco</groupId>
    <artifactId>ffmpeg</artifactId>
    <version>4.1.3-1.5.1</version>
    <classifier>macosx-x86_64</classifier>
</dependency>
<dependency>
    <groupId>org.bytedeco</groupId> 
    <artifactId>javacv</artifactId> 
    <version>1.5.1</version> 
</dependency> 

thank you

[saudet]

The filters you're using probably don't support your pixel format and are converting it to something else. Make sure to convert it back to what you need with, for example, the format filter after.

[saudet]

Duplicate of #945