Comments on: Limited Real AC3 Passthrough http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/ General things I find interesting Mon, 06 Oct 2008 21:34:58 +0000 http://wordpress.org/?v=2.6.2 By: Graham Booker http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11504 Graham Booker Wed, 30 Apr 2008 21:58:58 +0000 http://www.cod3r.com/?p=171#comment-11504 Guys, in this post I was talking about the AppleTV, as clearly stated by the first sentence. The ATV has QT 7.1, not 7.4.x. It is also a completely different animal when it comes to AC3. Nothing in this post has any bearing to playing files on a Mac. Guys, in this post I was talking about the AppleTV, as clearly stated by the first sentence. The ATV has QT 7.1, not 7.4.x. It is also a completely different animal when it comes to AC3. Nothing in this post has any bearing to playing files on a Mac.

]]> By: Pipermalibu http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11470 Pipermalibu Wed, 30 Apr 2008 14:46:36 +0000 http://www.cod3r.com/?p=171#comment-11470 Graham, are you saying that you have no problem with a handbrake ripped 0.9.2 DVD that has ONLY the AC3 stream in it? Mine are .M4V files. Again on 7.4.1 plays them fine, but 7.4.5 plays just hash. Several others are reporting the same... any ideas? Graham, are you saying that you have no problem with a handbrake ripped 0.9.2 DVD that has ONLY the AC3 stream in it? Mine are .M4V files. Again on 7.4.1 plays them fine, but 7.4.5 plays just hash.
Several others are reporting the same… any ideas?

]]> By: NeuralSpark http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11436 NeuralSpark Tue, 29 Apr 2008 19:07:29 +0000 http://www.cod3r.com/?p=171#comment-11436 VLC will play an AVI with x264 and AC3 in it (which I already have about 50 rips in, poor choice on my part) but it won't play find the AC3 stream in a MP4...even though they were both made by Handbrake 0.9.2. Even the standard codec packs on Windows won't find the AC3 steam. Yet Quicktime on the MacBook and ATV have no problem. I'm trying to avoid having to re-rip the AVIs, so I've investigated using VLC to transcode them but it complains about putting AC3 into a MP4, I think this is because the ISO has deemed AC3 an unsupported format for the MP4 standard, but that's just an educated guess. I played some with ffmpeg on Linux, trying to straight copy the x264 and AC3 streams from the AVIs into a MP4, but it messes up the timecodes and nothing will play it. VLC will play an AVI with x264 and AC3 in it (which I already have about 50 rips in, poor choice on my part) but it won’t play find the AC3 stream in a MP4…even though they were both made by Handbrake 0.9.2. Even the standard codec packs on Windows won’t find the AC3 steam. Yet Quicktime on the MacBook and ATV have no problem.

I’m trying to avoid having to re-rip the AVIs, so I’ve investigated using VLC to transcode them but it complains about putting AC3 into a MP4, I think this is because the ISO has deemed AC3 an unsupported format for the MP4 standard, but that’s just an educated guess.

I played some with ffmpeg on Linux, trying to straight copy the x264 and AC3 streams from the AVIs into a MP4, but it messes up the timecodes and nothing will play it.

]]> By: Graham Booker http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11425 Graham Booker Mon, 28 Apr 2008 21:36:24 +0000 http://www.cod3r.com/?p=171#comment-11425 Yes, .mp4 is likely the most cross platform. VLC now supports AC3 in that container. The best alternative that I know of .mkv, but that isn't natively supported on the ATV. I have yet to test its AC3 samples to see if their frames are properly translated into packets. Yes, .mp4 is likely the most cross platform. VLC now supports AC3 in that container. The best alternative that I know of .mkv, but that isn’t natively supported on the ATV. I have yet to test its AC3 samples to see if their frames are properly translated into packets.

]]> By: NeuralSpark http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11424 NeuralSpark Mon, 28 Apr 2008 21:27:56 +0000 http://www.cod3r.com/?p=171#comment-11424 Very informative, many thanks. I've been trying to find a platform-neutral way to store my DVD collection, and I think this has pushed me to .mp4. Very informative, many thanks. I’ve been trying to find a platform-neutral way to store my DVD collection, and I think this has pushed me to .mp4.

]]> By: Graham Booker http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11376 Graham Booker Fri, 25 Apr 2008 22:35:48 +0000 http://www.cod3r.com/?p=171#comment-11376 Don't know what to tell you, but if it worked in 7.4.1, it works in 7.4.5. Apple didn't break anything in 7.4.5, instead they actually fixed things. Don’t know what to tell you, but if it worked in 7.4.1, it works in 7.4.5. Apple didn’t break anything in 7.4.5, instead they actually fixed things.

]]> By: Pipermalibu http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11375 Pipermalibu Fri, 25 Apr 2008 22:01:26 +0000 http://www.cod3r.com/?p=171#comment-11375 I am still one of the many that have had to downgrade to 7.4.1 Quicktime, to keep the passthru working on files ripped with Handbrake and having just the AC3 to get DD5.1 - As soon as 7.4.5 is applied (with Perian installed)...immediate buzzing instead of soundtrack out of the digital output on a mini. My ATV has worked with these same files all along. Now I can not play my purchased tv shows and movie selections from iTunes, because they require 7.4.5 now. ANY input would be appreciated :) I am still one of the many that have had to downgrade to 7.4.1 Quicktime, to keep the passthru working on files ripped with Handbrake and having just the AC3 to get DD5.1 - As soon as 7.4.5 is applied (with Perian installed)…immediate buzzing instead of soundtrack out of the digital output on a mini. My ATV has worked with these same files all along. Now I can not play my purchased tv shows and movie selections from iTunes, because they require 7.4.5 now. ANY input would be appreciated :)

]]> By: EndlessRuin http://www.cod3r.com/2008/04/imited-real-ac3-passthrough/#comment-11345 EndlessRuin Thu, 24 Apr 2008 04:58:35 +0000 http://www.cod3r.com/?p=171#comment-11345 I actually discovered that AC3 passthrough in xvid files had an issue this weekend when I tried to play a television show. There was a loud obnoxious buzzing sound, like a chainsaw just less appealing instead of words and sounds as I am used to encountering. It took me a while to figure out what was wrong but, eventually I narrowed it down to the AC3 audio. It was the only difference between that xvid file and other ones that had been playing correctly. However, the difference between knowing something doesn't work and knowing why it doesn't work is immense. Thank you for explaining the process and the problems with the different types of codecs and containers. I actually discovered that AC3 passthrough in xvid files had an issue this weekend when I tried to play a television show. There was a loud obnoxious buzzing sound, like a chainsaw just less appealing instead of words and sounds as I am used to encountering. It took me a while to figure out what was wrong but, eventually I narrowed it down to the AC3 audio. It was the only difference between that xvid file and other ones that had been playing correctly. However, the difference between knowing something doesn’t work and knowing why it doesn’t work is immense. Thank you for explaining the process and the problems with the different types of codecs and containers.

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