ge2d-cvt strang picture

[ViktorButskikh]

Dear colleagues

During launching my ge2d-cvt I'm geting quite strange picture output.nv12 For making visualisation I use following command: ffmpeg -pix_fmt nv12 -f rawvideo -s 1920x1080 -i output.nv12 -pix_fmt rgb24 output.png

Can be the reason in old kernel 4.9 https://github.com/khadas/linux/tree/khadas-vims-4.9.y ?

![Uploading output.png…]()

[sravansenthiln1]

@ViktorButskikh the colorspace conversion example dumps a raw image buffer after converting to the nv12 colorspace, for visualization format it may need to be modified, I will check it and let you know

[ViktorButskikh]

Dear colleagues,

I've understood the reason of "broken" image. We have two planes. It means that NV12 writing should be slightly different that we have now. I have slightly modify function for nv12 write and usage of it:

int nv12_write(const char* luma_buf, const char* chroma_buf, const char* path, int width, int height) {
    int size;

    FILE* file = fopen(path, "wb");
    if (!file) {
        fprintf(stderr, "Could not open %s\n", path);
        return -1;
    }
    size = width * height;
    fwrite(luma_buf, size, 1, file);
    size = width * height / 2;
    fwrite(chroma_buf, size, 1, file);

    fclose(file);

    return 0;
}
...........................................................

/* Write output image */
    nv12_write(amlge2d.ge2dinfo.dst_info.vaddr[0], amlge2d.ge2dinfo.dst_info.vaddr[1], "./output.nv12", dst_width, dst_height);

...........................................................

For make visualisation of result I use command: ffmpeg -pix_fmt nv21 -f rawvideo -s 1920x1080 -i output.nv12 -pix_fmt rgb24 cam001.png

Look like we have NV21 instaed of NV12. Difference between NV12 and NV12 ins swapped U V components of chroma.

[sravansenthiln1]

@ViktorButskikh Thank you for your solution, I will test it and apply it :+1:

[sravansenthiln1]

Solution applied in abff044bf0555af62f94afde26d8b8339d1b6163, closing this topic