[Libav-user] What define the quality of a decoded video

Manu N audionuma at gmail.com
Fri Jun 21 19:23:59 CEST 2013


2013/6/21 ... ... <bersac_1 at hotmail.fr>

> HI,
> I have a basic .avi video. I decode it, reencode it using the same type of
> encoder without modifying the decoded data and finally I save it on one
> file of my computer. The saved video has a good framerate but it had lost a
> lot of quality in the process (it's now with a lot of pixel). I kwon that
> the image has been decoded without losing quality. The lost of quality
> appeared during the decoding and saving process.
> What define the quality of a decoded video ?
http://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio is one way to
evaluate this.
Basically, lossy encoding-decoding quickly leads to a quality degradation.

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