[FFmpeg-user] Quantify Video Quality

[dE .]

On 02/28/12 05:41, Jim Worrall wrote:
> On Feb 26, 2012, at 9:20 PM, Atish Kathpal wrote:
>
>> Hello
>>
>> I have a set of uncompressed videos in YUV format.
>>
>> I have obtained several derived copies in various formats and resolutions
>> from these yuv files using FFmpeg transcoding. (YUVs ---->  X Derived Copies)
>>
>> What I have also done is, transcode the yuv's into same resolution AVIs,
>> and now obtained the same set of derived (transcoded) videos treat the AVIs
>> as master. (AVIs ---->  X Derived Copies)
>>
>> Now I wish to compare the quality of transcoded videos, when derived from
>> AVIs to those derived from YUVs.
>>
>
> 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.
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You may like to take snapshots of some frame and then compare.

If you use a lossless codec, you can be ensured that there are no losses.