*_qcif.yuv 176x144 luma resolution with 4:2:0 chroma subsampling *_cif.yuv 352x288 luma resolution with 4:2:0 chroma subsampling The picture rate is in general 30 Hz, unless indicated in the filename otherwise. The format for *_qcif.yuv is as follows: The Y, U and V components are concatenated together, and all pictures in a sequence are cascaded into one file. Therefore, one file stores the pels as follows: 176 +-------------+ | | | Y | 144 | | | | +-------------+ | U |72 | 88 | +------+ | V |72 | 88 | +-------------+ | | | Y | 144 | | | | +-------------+ | U |72 | 88 | +------+ | V |72 | 88 | +------+ . . . In other words, if a program reads in the first 176x144=25344 bytes, it gets the first frame of the Y component. Then, if it skips the next 88x72x2=12672 bytes and reads the following 25344 bytes, it gets the second frame of Y. The format for *_cif.yuv is as follows: The Y, U and V components are concatenated together, and all pictures in a sequence are cascaded into one file. Therefore, one file stores the pels as follows: 352 +-------------+ | | | Y | 288 | | | | +-------------+ | U |144 | 176 | +------+ | V |144 | 176 | +-------------+ | | | Y | 288 | | | | +-------------+ | U |144 | 176 | +------+ | V |144 | 176 | +------+ . . .