Register FAQ / Rules Forum Spy Search Today's Posts Mark Forums Read
Go Back   MacRumors Forums > Apple Hardware > Apple TV and Home Theater

Reply
 
Thread Tools Search this Thread Display Modes
Old Mar 31, 2013, 12:07 AM   #1
Mr Dobey
macrumors 6502
 
Join Date: Aug 2008
Amount of encodes from source?

I was thinking about the quality of iTunes and started wondering at what point in the production chain is the iTunes video compressed.

So for a movie is the iTunes 1080p video compressed straight from the master studio file or do they get lazy and take the Blu-Ray file and compress it again into a lower bitrate version?

This especially came to mind since a lot of people here are taking Blu-Rays and re-encoding them to lower bitrates to play on their Apple TV's, making the video encoded twice.
Mr Dobey is offline   0 Reply With Quote
Old Mar 31, 2013, 08:28 PM   #2
MarkG21
macrumors regular
 
Join Date: Mar 2010
Apple does not encode their content from blu rays. They're a bit more professional (even if an encode with a blu ray looks better what Apple provides). I'm not exactly sure but I believe they get their source file from the studios and Apple does what they do.
MarkG21 is offline   0 Reply With Quote
Old Mar 31, 2013, 09:06 PM   #3
Nermal
Moderator
 
Nermal's Avatar
 
Join Date: Dec 2002
Location: Whakatane, New Zealand
Apple used to encode from 220 Mb/s ProRes 422 HQ, but I've heard that that is no longer the case. It's probably still a good baseline though...
Nermal is offline   0 Reply With Quote
Old Apr 1, 2013, 12:50 AM   #4
Mackan
macrumors 65816
 
Join Date: Sep 2007
I don't think Apple is encoding anything. They probably have a deal with the content providers (the film studios), requesting them to provide Apple with an iTunes compatible encode. And these studios likely use their master source. I doubt this master source file ever leaves the film studio, for security reasons. I could be wrong though...
Mackan is offline   0 Reply With Quote
Old Apr 1, 2013, 11:26 PM   #5
Mr Dobey
Thread Starter
macrumors 6502
 
Join Date: Aug 2008
Thank you guys.

I had the feeling Apple got a pre compressed video file according to the iTunes standards considering this is how they manage their music files.
Mr Dobey is offline   0 Reply With Quote
Old Apr 1, 2013, 11:36 PM   #6
StinDaWg
macrumors regular
 
Join Date: Apr 2012
Quote:
Originally Posted by Nermal View Post
Apple used to encode from 220 Mb/s ProRes 422 HQ, but I've heard that that is no longer the case. It's probably still a good baseline though...
There's a pdf file if you search online that has all the details, but this is what I've read as well.

----------

Quote:
Originally Posted by Mackan View Post
I don't think Apple is encoding anything. They probably have a deal with the content providers (the film studios), requesting them to provide Apple with an iTunes compatible encode. And these studios likely use their master source. I doubt this master source file ever leaves the film studio, for security reasons. I could be wrong though...
Apple hires outside encoding companies that encode the video from the studios and then send it to apple for final sale.
StinDaWg is offline   0 Reply With Quote
Old Apr 2, 2013, 02:37 AM   #7
spacepower7
macrumors 68000
 
Join Date: May 2004
Quote:
Originally Posted by Mr Dobey View Post
Thank you guys.

I had the feeling Apple got a pre compressed video file according to the iTunes standards considering this is how they manage their music files.
Woooo

What is pre compressed? Take the BluRay then compress it? Take the 4k or 2k DI to 1080p, that's compressed too. I think we'd have define what compression is tolerable.

1 hour of miniDV at "5:1" compression at Standard Def is 12-13GB

HDTV is compressed.

A CD is compressed too, so most iTunes music is a compression of a compression. But so was napster and almost every mp3 ever made.

Where an iTunes video is sourced and compressed is speculation until someone in the supply chain is willing to go on record. Maybe many of them won't bc they work for companies taking the lazy easy way? Who knows?

Just don't expect an easy answer bc some film companies will spend a little more for a higher quality product than others. Just like any industry.


My thinking would be, how do they get 80-90% of the quality at 20% the size of a BluRay. Or more likely, if the film has a good story, why am I analyzing the compression.
People get too caught up in the tech and numbers, rather than enjoying the story.
spacepower7 is offline   1 Reply With Quote
Old Apr 2, 2013, 09:08 PM   #8
StinDaWg
macrumors regular
 
Join Date: Apr 2012
As was said before, Apple uses 220 Mb/s ProRes 422 HQ.
StinDaWg is offline   0 Reply With Quote
Old Apr 3, 2013, 02:31 AM   #9
Che Castro
macrumors 601
 
Join Date: May 2009
So somebody sits there at apple and encode every movie


That's gotta be a fun job
Che Castro is offline   0 Reply With Quote
Old Apr 3, 2013, 08:51 PM   #10
Nermal
Moderator
 
Nermal's Avatar
 
Join Date: Dec 2002
Location: Whakatane, New Zealand
Quote:
Originally Posted by Che Castro View Post
So somebody sits there at apple and encode every movie


That's gotta be a fun job
It's automated. It'll be something like "drop folder of movies onto droplet, wait however long, grab output files".
Nermal is offline   0 Reply With Quote
Old Apr 4, 2013, 06:34 AM   #11
Mackan
macrumors 65816
 
Join Date: Sep 2007
Quote:
Originally Posted by Nermal View Post
It's automated. It'll be something like "drop folder of movies onto droplet, wait however long, grab output files".
At least someone needs to check the quality of the encode, making sure no artifacts in the video or audio.

For example, producing an AAC stereo track as a downmix from a multichannel audio source should require some individual handling, if they care about things like dynamic range and dialnorm. These are things that cannot be automated with tools like Handbrake.
Mackan is offline   0 Reply With Quote
Old Apr 4, 2013, 01:36 PM   #12
Nermal
Moderator
 
Nermal's Avatar
 
Join Date: Dec 2002
Location: Whakatane, New Zealand
Quote:
Originally Posted by Mackan View Post
At least someone needs to check the quality of the encode, making sure no artifacts in the video or audio.
Needs to, but doesn't. I've stopped buying from iTunes now with the amount of absolute rubbish on there.
Nermal is offline   0 Reply With Quote
Old Apr 9, 2013, 12:17 AM   #13
spacepower7
macrumors 68000
 
Join Date: May 2004
I've got a friend that has shows on HBO and trailers on YouTube, so I'll ask about the compression process.
spacepower7 is offline   0 Reply With Quote
Old Apr 25, 2013, 04:38 PM   #14
Mr Dobey
Thread Starter
macrumors 6502
 
Join Date: Aug 2008
Quote:
Originally Posted by spacepower7 View Post
I've got a friend that has shows on HBO and trailers on YouTube, so I'll ask about the compression process.
Thank You!
Mr Dobey is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Apple TV and Home Theater

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Best Handbrake presets for SD encodes from HD source alFR Apple TV and Home Theater 0 Oct 8, 2013 09:28 AM
Handbrake encodes SpectreOne3 Apple TV and Home Theater 2 Jun 5, 2013 01:28 PM
Which Encodes Faster: iDVD or DVDSP? LeicaM8 Mac Applications and Mac App Store 2 Dec 2, 2012 11:57 PM
Handbrake encodes Dolby 5.1 sound ? LevMac Apple TV and Home Theater 15 Aug 5, 2012 07:59 AM

Forum Jump

All times are GMT -5. The time now is 03:28 PM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC