Comments on: The Correct Way to Enable AC3 Passthrough with Quicktime http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/ General things I find interesting Sun, 07 Mar 2010 08:50:12 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Graham Booker http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-18167 Graham Booker Wed, 03 Mar 2010 05:07:52 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-18167 Again, this is not a support forum. No further comments will be accepted here. Replies with Make/Model of receiver are examined and the information is added to the post, but such posts will not appear. Those attempting to abuse this system will be denied access. Again, this is not a support forum. No further comments will be accepted here. Replies with Make/Model of receiver are examined and the information is added to the post, but such posts will not appear. Those attempting to abuse this system will be denied access.

]]> By: Dominik Pich http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-17045 Dominik Pich Fri, 07 Aug 2009 17:11:08 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-17045 For many recceivers, but especially some sony ones: set the receivers encoding! for sony for example it was: DEC PCM change it to: DEC AUTO voila :D For many recceivers, but especially some sony ones:

set the receivers encoding!

for sony for example it was: DEC PCM
change it to: DEC AUTO

voila :D

]]> By: Graham Booker http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-16975 Graham Booker Sun, 15 Mar 2009 02:16:50 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-16975 This is not a support forum. Any comments not pertaining to the make/model of a receiver and whether it works will be deleted. This is not a support forum. Any comments not pertaining to the make/model of a receiver and whether it works will be deleted.

]]> By: Graham Booker http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-15368 Graham Booker Sat, 23 Aug 2008 22:12:05 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-15368 ionos, On the audio settings, this is an issue with handbrake and it's interaction with QuickTime. I suggested they use a version 2 atom in the m4v file 4 months ago (http://forum.handbrake.fr/viewtopic.php?f=4&t=4726&start=25#p33363) but was ignored. In addition, the default channel layout is inconsistent with Core Audio, which I reported to Apple 5 months ago (rdar 5799879) and was also ignored. If either of these two corrected they errors, this wouldn't be an issue. ionos,
On the audio settings, this is an issue with handbrake and it’s interaction with QuickTime. I suggested they use a version 2 atom in the m4v file 4 months ago (http://forum.handbrake.fr/viewtopic.php?f=4&t=4726&start=25#p33363) but was ignored. In addition, the default channel layout is inconsistent with Core Audio, which I reported to Apple 5 months ago (rdar 5799879) and was also ignored. If either of these two corrected they errors, this wouldn’t be an issue.

]]> By: ionos http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-15365 ionos Sat, 23 Aug 2008 20:23:21 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-15365 Oddest thing (All samples created with handbrake; please forgive me if I don't get all the fancy abbreviations and terms right, I try my best): AVI Mpeg4 with AC3 - works in QT and VLC (i.e., DD sound) MKV H.264 with AC3 - works in QT and VLC So, it should be considered established that the receiver works, the cables work, stuff is installed ok, etc. M4V H.264 with AC3 - "Helicopter" in QT (i.e. the weirdo noise, input considered plain stereo by receiver), VLC seems to produce a valid stereo stream, but no surround sound. M4V H.264 with AC3 and AAC - same thing. Now, the funny part: In QT, open "Movie Properties". Select Surround track, then "Audio Setting". Swap "Right" and "Center". Press play. Bang. Dolby Digital, say hello. Well, the receiver says the input was Dolby Digital, and I hear different things coming out of the various speakers. Now, does that mean that the right channel is being played on centre, and vice versa? Doesn't sound like it, most talking still comes through the centre channel. Oddest thing (All samples created with handbrake; please forgive me if I don’t get all the fancy abbreviations and terms right, I try my best):
AVI Mpeg4 with AC3 – works in QT and VLC (i.e., DD sound)
MKV H.264 with AC3 – works in QT and VLC
So, it should be considered established that the receiver works, the cables work, stuff is installed ok, etc.

M4V H.264 with AC3 – “Helicopter” in QT (i.e. the weirdo noise, input considered plain stereo by receiver), VLC seems to produce a valid stereo stream, but no surround sound.
M4V H.264 with AC3 and AAC – same thing.

Now, the funny part: In QT, open “Movie Properties”. Select Surround track, then “Audio Setting”. Swap “Right” and “Center”. Press play. Bang. Dolby Digital, say hello. Well, the receiver says the input was Dolby Digital, and I hear different things coming out of the various speakers.

Now, does that mean that the right channel is being played on centre, and vice versa? Doesn’t sound like it, most talking still comes through the centre channel.

]]> By: Wim http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-10040 Wim Sun, 23 Mar 2008 21:43:58 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-10040 I'm talking with Apple from the post-production site of the story... I've also reported the bug... I would like to have this feature on every mac with optical out... Let's hope they listen... Greetz, Wim I’m talking with Apple from the post-production site of the story… I’ve also reported the bug… I would like to have this feature on every mac with optical out… Let’s hope they listen…

Greetz,

Wim

]]> By: Graham Booker http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-10034 Graham Booker Sun, 23 Mar 2008 21:00:34 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-10034 Wim, Yes, that would be nice. But for now, I have to seriously question Apple's commitment to HD because of their lack of support for AC3 on their own (see http://www.cod3r.com/2008/03/wheres-real-ac3-passthrough-on-the-mac/). BTW, AC3 doesn't do 7.1. You need Dolby Digital Plus, or Dolby TrueHD for that. Wim,

Yes, that would be nice. But for now, I have to seriously question Apple’s commitment to HD because of their lack of support for AC3 on their own (see http://www.cod3r.com/2008/03/wheres-real-ac3-passthrough-on-the-mac/).

BTW, AC3 doesn’t do 7.1. You need Dolby Digital Plus, or Dolby TrueHD for that.

]]> By: Wim http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-9998 Wim Sun, 23 Mar 2008 12:13:46 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-9998 Hello, I've just embedded a uncompressed Quicktime with a Dolby AC3 5.1 Surround testfile and it is working on the system... You would need QT Pro to do this but this is a big step forward to a QT based Uncompressed HD playout... Maybe in the future the mac would be a 4K files based playout system with AC3 DOLBY 7.1 ;-) Hello,

I’ve just embedded a uncompressed Quicktime with a Dolby AC3 5.1 Surround testfile and it is working on the system…

You would need QT Pro to do this but this is a big step forward to a QT based Uncompressed HD playout… Maybe in the future the mac would be a 4K files based playout system with AC3 DOLBY 7.1 ;-)

]]> By: Graham Booker http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-9956 Graham Booker Sun, 23 Mar 2008 00:41:52 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-9956 Wim, The SPDIF standard only allows either stereo PCM (uncompressed) data, or encoded digital audio (compressed). It does not allow 5.1 PCM (uncompressed) audio. For this, you need to get a computer audio device which has 6 discrete channels. In order to use the method I described above, you need to first compress the audio into AC3, and then play that back. Wim,

The SPDIF standard only allows either stereo PCM (uncompressed) data, or encoded digital audio (compressed). It does not allow 5.1 PCM (uncompressed) audio. For this, you need to get a computer audio device which has 6 discrete channels.
In order to use the method I described above, you need to first compress the audio into AC3, and then play that back.

]]> By: Wim http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/comment-page-1/#comment-9955 Wim Sun, 23 Mar 2008 00:26:36 +0000 http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/#comment-9955 Hello, What we would like to do is use a mac as a HD uncompressed 1920x1080 with 5.1 Surround player from Quicktime. The problem we had was that the receiver via Optical connection uses a stereo track (Toslink/SPDIF) and not a Multi-channel stream with 5.1 on the optical link... We have a full installed FCP Studio with compressor and soundtrack... What do we need to get it working? Hello,

What we would like to do is use a mac as a HD uncompressed 1920×1080 with 5.1 Surround player from Quicktime.

The problem we had was that the receiver via Optical connection uses a stereo track (Toslink/SPDIF) and not a Multi-channel stream with 5.1 on the optical link…

We have a full installed FCP Studio with compressor and soundtrack…

What do we need to get it working?

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