Grass Valley HQ Codec
Adjust the compression rate dynamically according to the image, Grass Valley HQ Codec is to achieve high image quality of DVCPRO HD and more than HDCAM.
If the bit rate is fixed in the format as tape media, it is possible that the lack of reproducibility of detail in the video very complex. But do not be like that has been adopted in the Grass Valley HQ Codec In the “variable bit rate”. In addition, in order to prevent data from getting too big, and it is to be able to set the limit of the maximum bit rate. Variable bit rate method it is possible to reduce the amount of data while maintaining the image quality is a big advantage for the non-linear editing system.
The role of the pre-filter
HDCAM, DVCPRO HD, has reduced 1440 (HDCAM) 1920 pixels in the horizontal direction, in 1280 (DVCPRO HD) by the pre-filter when recording to tape media both. Applying a pre-filter as well in non-linear editing system is common, big difference in the image quality depending on whether done in software or in hardware do it.
Be applied to real-time software pre-filter of the ideal characteristics is not possible with CPU processing power of current. It has responded by increasing the processing speed at the expense of performance in other products therefore, has become a cause of image degradation.
By implementing hardware with pre-filter ideal characteristics HD deck level, HDWS series, maintaining high image quality.
Grass Valley HQ Codec is also compatible to the full HD resolution of 1920×1080. It was developed on the assumption workflow with HD D5 and HDCAM SR deck used in the CM-intensive production studio and HD video recording, the CG.
Because through the pre-filter, is subjected to direct compression without having to down-sampling, and enables real-time editing while maintaining almost completely the frequency characteristics of the original.
The variable bit rate system and basic technology of Grass Valley HQ Codec, I have realized the compression efficient. It can be compressed to about 1/5 the size of the original picture.
Alpha channel support:
I now supports alpha channel 8-bit is the world’s first codec HD.By storing in the Grass Valley HQ Codec and CG that was created in 3D software and Adobe After Effects, as compared to the data delivery are sequential still images, effort and time, it can be also significantly reduce the file size You. Details of alpha channel support here .
It is also possible to output the mat file added with the alpha information in bin window.
Grass Valley HQX Codec
Traditional Grass Valley HQ Codec and further evolve the characteristics of, I realized the high quality and high efficiency true.
image quality and real-time high-speed processing
4:2:2 component (YCbCr 4:2:2) corresponding
corresponds to (YCbCrA 4:2:2:4) with alpha channel data
Supports 1920 × 1080 50i/59.94i, also 50p/59.94p
Support for up to 4k resolution (4096 × 2160)
Support for frame size / rate unbreakable bound by broadcasting format, field order, and pixel aspect ratio
Adaptive conversion process that can respond effectively to interlaced video
progressive mode that can respond effectively to the progressive video
(picture degradation when repeated compression and decompression is small) high resistance Generation
to low bit rate from the high image quality comparable to uncompressed, it can be applied to flexible
More info: http://www.grassvalley.com/docs/WhitePapers/professional/GV-4097M_HQX_Whitepaper.pdf