>y_1strow += Width;
>y_2ndrow += Width;
Check this to see if it is your problem.
Appears you should be using the pitch for this and not the width.
Normally width is width of video and pitch is the number of bytes per
line and can be greater than width.
On 7/27/2016 11:05 PM, Ankush Wadke wrote:
Thanks for the reply Harry.
And yes it has something to do with the offset of U and V planes but
it works perfectly fine for a FHD stream i.e. 1920x1080 but dosent
seem to for a 3840x2160 stream. Does planer data require alignment to
be considered?
On Wed, Jul 27, 2016 at 7:51 PM, Harry <[email protected]
<mailto:[email protected]>> wrote:
Green borders are a wrong offset / starting address for the UV planes.
Harry
Sent from my smartphone
On 27 Jul 2016, at 11:47, Ankush Wadke <[email protected]
<mailto:[email protected]>> wrote:
Hi everybody,
I am stuck with a problem to which I am not able to figure
out what exactly is wrong.
I am decoding a 4k video which gives me a YUV420P output
frame. In order to convert it to UYVY I wrote a piece of code.
which works fine for first frame, then second frame has a small
green line and the third frame has the colors totally displaced.
I am getting the correct frames sometimes but i am not able to
figure out what is wrong with the other frames.
It would be really helpful if someone would point me to
something tat would help.
hers the code i am using for conversion,
void Convert_yuv420_to_yuv422(const AVFrame &videoBuffer, uint8_t
* opBuffer, const int const &Width, const int const &Height)
{
uint8_t *buffer_uyvy_1strow = opBuffer,
*buffer_uyvy_2ndrow = opBuffer+(2*Width);
uint8_t*y_1strow = videoBuffer.data[0],
*y_2ndrow = videoBuffer.data[0]+Width;
uint8_t * u_ptr = videoBuffer.data[1];
uint8_t * v_ptr = videoBuffer.data[2];
for (unsigned int i_conv_ht =0; i_conv_ht<Height;i_conv_ht+=2) {
for (unsigned int i_conv_wt =0; i_conv_wt<Width;i_conv_wt+=2) {
*buffer_uyvy_1strow++ = *u_ptr;
*buffer_uyvy_1strow++ = *y_1strow++;
*buffer_uyvy_1strow++ = *v_ptr;
*buffer_uyvy_1strow++ = *y_1strow++;
*buffer_uyvy_2ndrow++ = *u_ptr;
*buffer_uyvy_2ndrow++ = *y_2ndrow++;
*buffer_uyvy_2ndrow++ = *v_ptr;
*buffer_uyvy_2ndrow++ = *y_2ndrow++;
++u_ptr;
++v_ptr;
}
y_1strow += Width;
y_2ndrow += Width;
buffer_uyvy_1strow += FFALIGN((2*Width),1);
buffer_uyvy_2ndrow += FFALIGN((2*Width),1);
}
}
Regards,
Ankush
*
*
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--
*Ankush Wadke
*
Mob: 9673898604
Email: [email protected] <mailto:[email protected]>
*
* in.linkedin.com/pub/ankush-wadke/36/868/981/
<http://in.linkedin.com/pub/ankush-wadke/36/868/981/>
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