[FFmpeg-user] PSNR measure

[Carl Eugen Hoyos]

2018-07-13 15:10 GMT+02:00, José María Infanzón <jocheinfa at gmail.com>:
> 2018-07-12 21:52 GMT-03:00 Carl Eugen Hoyos <ceffmpeg at gmail.com>:
>
>> 2018-07-13 2:39 GMT+02:00, José María Infanzón <jocheinfa at gmail.com>:
>> > Hi - I need to measure quality if a live stream, and I was
>> > thinking of measuring PSNR. So I was wondering how
>> > can I run this test since it is a live stream
>>
>> > I do not have a refence stream or video.
>>
>> Then what exactly do you want to measure?
>
> I need to find a metric that somehow let me know if the
> stream has an acceptable quality

While "acceptable quality" is to the best of my knowledge not a
defined metric, it may be useful to measure the quality of an
encoding of your given stream: In general, high quality input
produces better encodings for a given bitrate.
Before actually using this, you should test with many known
"good" and "bad" streams to actually verify this for your use
case.

Carl Eugen