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

[bun bun]

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?
Thanks.



--- On Tue, 5/12/09, Jason Garrett-Glaser <darkshikari at gmail.com> wrote:

From: Jason Garrett-Glaser <darkshikari at gmail.com>
Subject: Re: [x264-devel] what is the difference between fps parameters!
To: "Mailing list for x264 developers" <x264-devel at videolan.org>
Date: Tuesday, May 12, 2009, 3:15 AM

On Mon, May 11, 2009 at 1:08 PM, bun bun <binhlh86 at yahoo.com> wrote:
> Hi all,
> I use this command for encode:
> ./x264 -q 30 --bframes 2 --ipratio 1.4 --pbratio 1.3 -p 1 --fps 10
> /root/Desktop/PSNR_tobe_in_rush/fps/akiyo_cif.yuv 352x288 -o
> /root/Desktop/PSNR_tobe_in_rush/fps/fps10_qp30.264 -v --progress
>
> output:
> ==>
> encoded 300 frames, 20.90 fps, 17.13 kb/s ==> what is the difference between
> --fps 10 and the output fps 20.90?

That's the encoding speed, not the output fps.

Dark Shikari
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