I'm not sure I understand what you mean, do you mean a hash like md5 and sha1? Could you please elaborate and simplify a bit?
On Sat, Sep 30, 2023 at 7:51 PM MediaMouth <[email protected]> wrote: > What about using a hash to check your existing against your possibly new / > possibly matching file. If it's a match don't run ffmpeg on it. Assuming > i'm understanding what you're trying to achieve, it would seem better > practice not to touch the file with ffmpeg when you can avoid it. > > > On Sep 30, 2023, at 16:43, Stéphane Archer <[email protected]> > wrote: > > > > 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? > > > > Best regards > > > > Stéphane Archer > > _______________________________________________ > > ffmpeg-user mailing list > > [email protected] > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > [email protected] with subject "unsubscribe". > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > -- Best Regards, Stephane Archer _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
