Why YUV format is used in MPEG2/MPEG4/H264encoders for compression ?

  MPEG2/MPEG4/H264 is lossy compression.
RGGB will have image details/color information in all the RGB represented bytes.
if we are applying for lossy compression, there is a chance for losing bits information.
if LSB bits are affected there wont be a big change in image. If MSB bits of RGB is lost,
this will be bigger change in image and user can perceive/can observe the changes in image.

  In YUV format, image details will be available in Y data[ this will have monochrome/ black and white image]. U and V component is used to store color information.

  Eyes can't perceive color information changes than image information. But it can easily observe the changes in image information[Y data which will have black/white image]. So In lossy compression, encoders wont disturb the image information & will
disturb or compress more in color information [UV components]

     If we are using RGB, we cannot separate image information & color information.Because all the pixels will have the image information and color information.

This is the reason why we are using YUV format in lossy compression or MPEG2/MPEG4/H264 encoders.


   

Display settings affected the Filter's RGB output

YV12 to RGB565 Filter is not working if theDesktop display settings have 32 bit mode.

YV12 to RGB565 Filter Gives output as RGB16 if the Desktop Mode is RGB16YV12 to RGB565 Filter Gives output as RGB32 if the Desktop Mode is RGB32Even though we set the Output Format as RGB16 for the YV12To RGB565 Filter, it is being set as RGB32.
if I developed the Filter with Output as RGB16, the display settings mode is as follows:
1.Based on display settings mode,The Output RGB format of the Filter will be determined Ex:
I developed the YV12To RGB565 Filter.It outputs RGB565 format. RGB565 format is working if the Display settings mode is as 16 bit mode.
But while I checking the Filter's Output Pin properties and it becomes RGB32 if Displaysettings mode is as 32 bit.

So I Checked the YV12ToRGB Filter's output format as RGB565 within CheckTransform() fn.if I checked like this, then I got the problem. The YV12ToRGB filter is not connected to the MPEG4 Decoder Filter.
How can we solve this issue ?
based on the Display settings mode, i set the output Buffer size as RGB 16 or RGB 32.

Display settings affected the Filter's RGB output

YV12 to RGB565 Filter is not working if theDesktop display settings have 32 bit mode.

YV12 to RGB565 Filter Gives output as RGB16 if the Desktop Mode is RGB16YV12 to RGB565 Filter Gives output as RGB32 if the Desktop Mode is RGB32Even though we set the Output Format as RGB16 for the YV12To RGB565 Filter, it is being set as RGB32.
if I developed the Filter with Output as RGB16, the display settings mode is as follows:
1.Based on display settings mode,The Output RGB format of the Filter will be determined Ex:
I developed the YV12To RGB565 Filter.It outputs RGB565 format. RGB565 format is working if the Display settings mode is as 16 bit mode.
But while I checking the Filter's Output Pin properties and it becomes RGB32 if Displaysettings mode is as 32 bit.

So I Checked the YV12ToRGB Filter's output format as RGB565 within CheckTransform() fn.if I checked like this, then I got the problem. The YV12ToRGB filter is not connected to the MPEG4 Decoder Filter.
How can we solve this issue ?
based on the Display settings mode, i set the output Buffer size as RGB 16 or RGB 32.