[FFmpeg-user] Quantify Video Quality

[dE .]

On 02/28/12 17:57, Atish Kathpal wrote:
> @ Andrey  yes, thats right. I am interested in finding if there is any
> difference in quality of videos derived from an uncompressed (YUV) master
> as against an AVI master. And I would like to put some numbers against that
> quality, rather than having to manually look at the videos to know how they
> differ in terms of quality.
>
> Is there a tool to help me do that? Can FFmpeg itself report the
> signal:noise ratios you talk about?
>
> Thanks
> Atish
>
> On Tue, Feb 28, 2012 at 3:11 PM, Andrey Utkin<
> andrey.krieger.utkin at gmail.com>  wrote:
>
>> 2012/2/28 Jim Worrall<coniophora at gmail.com>:
>>> It is hard to imagine that the quality of the final transcoded videos
>>> could be improved by going from an uncompressed file through some
>>> (unspecified) codecs in an AVI first.  I would assume that the final
>>> file made directly from the YUV is better.
>>>
>>> To compare the quality, I would just look at a few samples.
>> As i got the idea, the guy asks how can he calculate Signal to Noise
>> Ratio in derived files.
>>
>> --
>> Andrey Utkin
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I think you can also take snapshots using mplayer and analyze it in GIMP.