Here is the issue with chroma decoding.
I feed to decoder the file:
And get decoded:
The picture is coded as JC_YCBCR with subsampling JS_422
If I decode this picture into JC_GRAY - I get goot quality grayscale picture.
But if I require to decode this picture into the colorspace and subsampling
as it is coded internally: JC_YCBCR with subsampling JS_422
I see wrong image.
How to fix it?
| Attachment | Size |
|---|---|
Download  What-I-decode.jpg | 545.65 KB |
| Download What-I-see.jpg | 79.68 KB |
Hello,
How do you set the output video format? some samle code may be helpful here:
I see from the MJPEG sample code, it needs to set as YUY2:
if(JS_422 == sampling && JC_YCBCR == color)
{
m_colorFormat = YUY2;
m_frameStep = m_frameDims.width*2;
}
My code is there^ jerr = m_decoder.ReadHeader(&in_width, &in_height, &in_channels, &in_color, &in_sampling, &in_precision); // Allocate buffer here jerr = m_decoder.SetDestination(p42xP4, n42xStepP4, dim4xxY, in_channels, in_color, in_sampling, 8, scale); jerr = m_decoder.ReadData();
In IPP 6.1 everithing worked fine.
Why it has been changed?
