FORUMS: list search recent posts

Proper export settings for youtube, getting gamma shift

COW Forums : Apple Final Cut Pro Legacy

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Chris Nicholas
Proper export settings for youtube, getting gamma shift
on Aug 23, 2012 at 10:46:35 pm

my issue is that my footage after being uploaded to youtube is not consistent from browser to browser (on the same computer/monitor setup).
the distribution is 100% web so i am not interested in hearing "just use a broadcast monitor and forget what the computer shows".

here is an example:


top left is youtube on chrome (matches FCP)
top right is youtube on safari
bottom left is VLC (matches FCP)
bottom right is quicktime X

see how desaturated safari and quicktime are vs chrome and VLC? chrome and VLC match FCP.

i thought it was maybe just how safari handled the video, but other youtube videos were identical when viewed next to each other with chrome and safari. this leads me to believe that it must be my file that is somewhow the culprit.
it seems that it must be related to the h.264 gamma bug that i've been reading about but i can't find any fixes that work.
i've tried using the x264 plugin that claims to fix the problem with gamma tagging but that doesn't change anything for me.
at the end of the day i really don't care about the variation between the media players, but since my final destination is youtube, i would like to be consistent on this platform.

my workflow:
5DmkII
transcode to apple prores 422
edit in FCP7
send to compressor (have tried various h.264 and mp4 settings, no fix with any)

how do you guys export for web? anyone encounter this issue?


Return to posts index

Rafael Amador
Re: Proper export settings for youtube, getting gamma shift
on Aug 23, 2012 at 11:31:37 pm

Do you have QT.7 installed?
if not, do it, and try again.
rafael

http://www.nagavideo.com


Return to posts index

Anna Ingenthron
Re: Proper export settings for youtube, getting gamma shift
on Aug 23, 2012 at 11:58:03 pm

Not sure if I can be completely helpful, but I do know some web browsers (such as Safari) are color managed and some are not. If it is color managed, it will read each file's embedded profile and convert/map to your monitor profile for true color. If it does not color manage, it applies a default profile. I'm not sure if you can somehow embed your video's color profile to play accordingly.


Return to posts index


Rafael Amador
Re: Proper export settings for youtube, getting gamma shift
on Aug 24, 2012 at 3:33:49 am

QT doen't allows embed color profiles.
The x264 QT Component allows to chose between SD and HD profiles, but Apple H264 doesn't.
So i asume that every H264 exported from QT is Rec 709, that is the standard HDTV color space.
That match the sRGB color space that is the standard for computer screens:
http://en.wikipedia.org/wiki/SRGB

Read the first two lines, and if you want to know more read this:
http://en.wikipedia.org/wiki/Rec._709
Compare sRGB Gamut and Rec709 primary Chromaticity in both articles.

I think that trying any kind of color managing you can get things even worst.
read the post number 14:
http://forums.adobe.com/message/3363846
As the post points, trying to get the same picture in the different players available in the market is more or less impossible, because each player makes a different YUV/RGB conversion.

I've suggested to install QT.7 because, at least in Snow Leopard, QT.X doesn't display gamma properly if QT.7 isn't installed. QT .7 it doesn't get installed with SL.
you need to install it from the disc.
no idea in Lion or Mountain Lion.
rafael

http://www.nagavideo.com


Return to posts index

Chris Nicholas
Re: Proper export settings for youtube, getting gamma shift
on Aug 25, 2012 at 11:16:52 pm

thanks for all the replies. i don't mind so much that quicktime and VLC are differing - if i want to watch it on my local machine i'll just use whatever player works for me. the real issue is how to get consistent results between browsers. somehow others are able to (i.e. if i open up other peoples' youtube videos in safari and chrome, they match. yet when i open my video up on youtube in the two browsers, they don't match). there must be something with my files that's causing this issue?


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]