Ripping Blu-Rays II - Page 223 - AVS Forum
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post #6661 of 6665 Old Today, 06:25 AM
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Originally Posted by DotJun View Post
You should crop out the letterboxing as this will save some bit rate.

If you absolutely need a file to be a specific size, then yes, do 2-3 pass. If you only need the file around a ballpark size then IMO you are better off sticking to crf and tweaking the crf value or other settings that affect compression like Decimation.
How do you crop the letterboxing and keep the full frame? Is this the cropping feature under the picture tab?

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PSNR and SSIM are the easiest. Not saying it's 100%, just saying it is objective.
I've noticed these are settings under "tune" how do they correlate to judging quality?

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post #6662 of 6665 Old Today, 12:12 PM
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Originally Posted by ScottJ View Post
That's what Beamr Video is supposed to do. AFAIK it's only available as a commercial solution, sold to Netflix et al.
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Originally Posted by DotJun View Post
PSNR and SSIM are the easiest. Not saying it's 100%, just saying it is objective.

Edit: Let me clarify that when I talk of transparency in a compressed video I am not saying it is bit for bit exact. I have never and will never make claims like this. What I am saying however is that something I find transparent is so close to the source that it's not worth fretting about. Yes, I understand that some people will be up in arms if there is one off colored pixel in a single frame somewhere in the video, but I'm not that person [emoji4]
Beamr is a tool to compress, and from my quick read I'd guess that they developed better perceptual encoding. I was asking about a tool that would objectively compare, i.e. without human involvement, a 1:1 rip of a retail Blu-ray with a re-encoded copy.

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post #6663 of 6665 Old Today, 12:18 PM
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Originally Posted by pepar View Post
Beamr is a tool to compress, and from my quick read I'd guess that they developed better perceptual encoding. I was asking about a tool that would objectively compare, i.e. without human involvement, a 1:1 rip of a retail Blu-ray with a re-encoded copy.
Their "breakthrough" is not in perceptual encoding, but a better way to measure the visible differences between two videos. (Call it perceptual differencing?) They repeatedly try different reencodings, with varying compression parameters, and measure the visible degradation. If it's too much, they throw it out and try again.
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post #6664 of 6665 Old Today, 12:51 PM
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Can Handbrake be used to re-code DD 5.1/AC3 audio into AAC for the .MP4 container while leaving the video alone and just passing it through?

I have some HDTV recording files from my TiVo I'm been experimenting with. I used Video ReDo to convert the MPEG-2 files to H.264 and saved them as .m2ts. Unfortunately this was a while ago and I have since deleted the original .tivo MPEG-2 source. Recently, I used VRD to re-mux them into an .MP4 container to experiment with playing them on my TiVo. Apparently VRD leaves the audio as AC3. When I send them back to my TiVo the video plays but not the audio. Someone in another thread suggested the audio would need to be converted from AC3 to AAC for the MP4 container.

So the files are already H.264 encoded and I don't want Handbrake to re-code them yet another time -- just convert the audio and remux. Can Handbrake do this? Can it take the .m2ts file, convert the audio to AAC and remux to MP4 while just passing the video stream through?

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post #6665 of 6665 Old Today, 01:22 PM
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Quote:
Originally Posted by ScottJ View Post
Their "breakthrough" is not in perceptual encoding, but a better way to measure the visible differences between two videos. (Call it perceptual differencing?) They repeatedly try different reencodings, with varying compression parameters, and measure the visible degradation. If it's too much, they throw it out and try again.
It's the measuring part that interests me, and just how that could be done objectively. Of course, the followup question is would you want to objectively measure a subjective difference? Ooooo, down the rabbit hole ....

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