[FFmpeg-user] Is there a way to re-encode an inefficiently encoded file without losing quality and reducing file size?

[Andrew Randrianasulu]

вс, 1 окт. 2023 г., 02:43 Stéphane Archer <archerstephane at gmail.com>:

> Let's say you have a video file encoded with high bitrate with the
> ultra-fast preset in H.264 because you couldn't afford CPU at that time.
> Now you have a huge file mostly because it was encoded quickly.
>
> You are now two days later with access to a good CPU and GPU.
>
> If you re-encode that file to save space then you are going to lose quality
> because even AV1 with a high bitrate is lossy (and you want to reduce that
> high bitrate)
>
> Otherwise, you can try transcoding using lossless compression but during my
> testing, this is making the file way bigger no matter what I tried.
>
> So basically, I can lose quality, or keep the big original file...
> Do you know a better way? Is there a way to re-encode that inefficiently
> encoded file without losing quality and reducing file size?
>


may be try two-pass encoding?

>
> Best regards
>
> Stéphane Archer
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