[x264-devel] what is the difference between fps parameters!

[Jason Garrett-Glaser]

On Mon, May 11, 2009 at 3:32 PM, bun bun <binhlh86 at yahoo.com> wrote:
> Dear sir,
> Thank you for your answer. When I use the option --fps with different value,
> I have the result:
> Qp    --fps    Fps (encoding)    Bitrate
> 30    10    19.21                     17.13
>        12    20.55                    20.56
>        14    20.4                     23.99
>        16    20.29                    27.41
>        18    19.81                     30.84
>        20    20.99                      34.27
>        22    19.98                     37.69
>        24    20.5                       41.12
>        25    19.17                   42.83
>        26    19.88                    44.55
>        28    20.45                   47.97
>        30    20.56                51.4
>        32    10.45               54.83
>        34    16.44             58.25
>        36    16.13                61.68
>        38    16.48               65.11
>        40    16.63            68.53
>        60    11.75             108.8
>
> As I have known that the output bitrate is better, the PSNR (video quality)
> is higher. However, when I watch the video encoded by different --fps value,
> I can not realize this and I have also try to calculate psnr between these
> videoes, the result said that these video have the same psnr.
> Could you explain it for me?

Higher FPS means fewer seconds for the same number of frames.  Bitrate
is (filesize) / (length in seconds).

Anyways this is hardly an x264-devel question.

Dark Shikari