[x264-devel] output at crf 20 larger than source??

[Igor Mozolevsky]

On 11 September 2011 17:31, sean darcy <seandarcy2 at gmail.com> wrote:

>>>    Stream #0.0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] /
>>> 0x0002), yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 25000 kb/s, 29.97 fps,
>>> 29.97 tbr, 90k tbn, 59.94 tbc

> Where did you get the 560,000 kb/s? Or is this 20+ ratio "Just Known"?

1440*1080 * 1.5 * 30000/1001 * 8 ~= 560 Mbps

frame size * yuv coding (full size Y plane + 1/4 size U + 1/4 size V
plane) * fps * bits/sample