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Two Blurays with same file look different?
I created a HDV 1080i60 video using Final Cut Pro 7 and outputted a Quicktime file for creating the Bluray disc. I created a MPG2 Bluray using compressor on the mac and I MPG2 Bluray using Adobe Media Encoder on the PC. Created the Blurays on both systems. When watching the two discs using the same Bluray player outputted to the same Broadcast NTSC monitor, the Bluray from the mac is darker and has more chroma the the Bluray from the PC. Is there a way to correct this? My client is starting to doubt my FCS system versus the PC system. Please any help would be great!
Thanks,
John Schenkel -
10 Replies
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We have created over 100 BluRay discs using Apple Compressor to create MPEG-2 files. Our end product looks identical to the original FCP HD timelines both when played back on HD Plamsa Screens and on HD Projectors in multiple venues.
I have no idea how you are monitoring your footage in FCP, but we view all our projects on FSI 2450W and 1760W HD Reference monitors and Panasonic 42 and 50″ Pro HD Plasmas. If you are only using your computer screen to monitor your projects, then this is an incorrect way to work and would most likely result in any BluRay disc not looking exactly as it does in your computer.
We do proper color correction on all projects before they are finished and prior to the Compression. In Compressor, we only have our own settings for data rate that we change. We use no filtering or any other effects in Compressor for the files.
I have had nothing but bad luck with Adobe and BluRay authoring. You can read about this in my blogs and over on the Adobe Encore forum.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author.
HD Post and Production
Biscardi Creative Media“Foul Water, Fiery Serpent” now in Post.
Creative Cow Forum Host:
Apple Final Cut Pro, Apple Motion, Apple Color, AJA Kona, Business & Marketing, Maxx Digital. -
Hi John,
That’s is the historical PC/Mac gamma difference (2.2 vs 1.8).
You need to apply the Gamma filter in Compressor. You may try 0’98.
You can have a, If you have not an external monitor, setting your screen at 2.2 Gamma will give you an idea of how things will look in a PC/TV. Or you can, in QT, set “Allow FC Color Compatibility”.
Think that the FC canvas, display at 2.2, so it should be reference for PC/TV display.
Best,
Rafael -
Walter,
Thank you for all of the info. I totally understand the monitor issue. I’m not looking at it through a computer monitor and I’m not talking about the editing process and checking it through my scopes, etc. I am just talking about taking the same Quicktime file, compressing it on the mac and the pc, and comparing the two Blurays using the same Bluray player and the same broadcast HD monitor. Why does the mac version have more chroma and more contrast than the pc version?
Thanks again,
John -
[John Schenkel] “Why does the mac version have more chroma and more contrast than the pc version?”
No clue. Which one looks like the original FCP timeline? We have two BluRay players in our shop to test all the discs and regardless of the player or the display we use, we always see exactly what we saw from FCP.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author.
HD Post and Production
Biscardi Creative Media“Foul Water, Fiery Serpent” now in Post.
Creative Cow Forum Host:
Apple Final Cut Pro, Apple Motion, Apple Color, AJA Kona, Business & Marketing, Maxx Digital. -
Yes Walter, but you make all the BR in Mac.
He have compressed one in a PC and the other one in a Mac.
Hardly will have the same Gamma.
Rafael -
[John Schenkel] “I created a MPG2 Bluray using compressor on the mac and I MPG2 Bluray using Adobe Media Encoder on the PC.”
Sorry, but those are not the same files! You’ve encoded 2 different files on 2 different platforms. Granted, you used the same file for input in both cases, but your output is now 2 totally different files. I would be surprised if they did not look somewhat different.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/ -
Thanks for all of the great input,
I know each compression will look different in many ways, like the amount of noise, interlacing, etc. I am just trying to figure out why there is this gamma issue. It’s really a very simple question. I have done some reading about the gamma issue, and it might be related to the Quicktime. I’ll try a H264 right out of FCP using the share feature. I’ll let you know how that compares. By the way, the Adobe compressed BD looks more like the original.
Thanks again,
John -
[Rafael Amador] “Yes Walter, but you make all the BR in Mac.”
No. We compress the file on a Mac, then we Author and burn the BluRay on a PC.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author.
HD Post and Production
Biscardi Creative Media“Foul Water, Fiery Serpent” now in Post.
Creative Cow Forum Host:
Apple Final Cut Pro, Apple Motion, Apple Color, AJA Kona, Business & Marketing, Maxx Digital. -
Different encoders yield different results. Neither one are very good encoders so don’t expect miracles. You should also be encoding an 8 bit uncompressed file. 8bit since its coming from an HDV source.
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[walter biscardi] “No. We compress the file on a Mac, then we Author and burn the BluRay on a PC”
Yes, but the compression (that is where the gamma may change) is done in a Mac.
The authoring can change nothing in the picture.
And is not just a matter of the compression: even the different players change the gamma.
An H264 looks different when played with Flash than when played with QT.
rafael
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