search

lisamelton / video_transcoding

Tools to transcode, inspect and convert videos.
MIT License
2.39k stars 160 forks source link

4k to 1080p #267

Closed tehbdg closed 5 years ago

tehbdg commented 5 years ago

Hi.

As my sad little i3 Plex server doesn't have the horsepower to transcode from 4k to 1080 in real time when I am watching on non-4k devices, I was thinking of making a few 1080 rips of 4k content on my i7 box. The problem is I can't work out how to do it. I have used the --720p switch in the past but the PQ looks a little dodgy. Is there an easy way of doing a 1080p rip?

Cheers

lisamelton commented 5 years ago

@tehbdg I think you mean a 1080p transcoding, right? Because you've already ripped the 4K?

If so, just use the --max-width and --max-height options like this to scale your 4K video into a 1920x1080 boundary:

transcode-video --max-width 1920 --max-height 1080 "/path/to/Movie.mkv"

Does that work for you?

tehbdg commented 5 years ago

Thanks @donmelton , I will give it a whirl after my current encoding is complete.....

tehbdg commented 5 years ago

@donmelton That worked perfectly. I have also been trying out the --avbr setting, and it seems to be working out great, I had to reinstall the transcode-video packages using gem as I don't think the docker version has been updated yet. Using x264-10bit and --avbr on a UHD movie I am currently getting an average of 14.8 frames per second encode. Usually on x265-10 bit --simple I get around 3-4 fps. Obviously the files work out to be bigger. I just did a comparison using Once Upon A Deadpool 1080p. The original Remux was around 35gb. --AVBR x264 1080p is 9.289 gb Your old system worked out to be 15.4 gb --simple x265 is 9.226 gb That's pretty amazing.

tehbdg commented 5 years ago

@tehbdg I think you mean a 1080p transcoding, right? Because you've already ripped the 4K?

Sorry, I missed that. Yes I have already ripped the movies, now I want to transcode.

lisamelton commented 5 years ago

@tehbdg I'm glad that worked for you! And that you're using and enjoying the new --avbr ratecontrol option. Thanks.

I'll close this now since your original issue is now resolved but feel free to comment again here or open new issues if you have additional questions.