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13th November 2008, 00:45 | #6961 | Link |
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I was playing around with the new floating point output and i wonder which offers better quality: AC3 decoded with nero (24 bit output) or AC3 decoded with libav to floating point?
What do you think? Is floating point output preferable over nero decoder? For sure the difference will be very small, but i don't have that much expensive equipment to test my self. Can anyone tell? Last edited by nautilus7; 13th November 2008 at 01:13. |
13th November 2008, 01:16 | #6963 | Link |
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I guess dolby surround is the old "analog" dolby surround pro logic (center and surround channels matrixed into left and right), while dolby headphne is something similar (equivalent), but specially developed for headphones.
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13th November 2008, 02:02 | #6964 | Link | |
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Not sure what you use to find the information but I assume the xpl files so I've zipped them up. http://www.flowerdayconsulting.com/Misc/vpl.zip |
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13th November 2008, 04:32 | #6965 | Link | |
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Thanks madshi for contacting me directly about this file. It does use spectral extension. I had implemented the feature in the "sandbox" repository from the original Google Summer of Code project, but had not merged to FFmpeg SVN because I only had 1 sample file to test... until now!! With this sample and another (also provided by madshi) working properly, I decided to merge the changes to FFmpeg SVN. |
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13th November 2008, 05:02 | #6966 | Link | |
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First of all, we don't know what the Nero decoder does internally. It might be completely fixed point, or maybe it uses floating point everywhere and just converts to 24-bit at the end. The lavc decoder uses 24-bit fixed point for everything up to the IMDCT and downmixing in each block. If I had a 24-bit fixed-point IMDCT implementation it would not use floating point at all. The only reason the downmixing is floating point is because it's sometimes done after the IMDCT. |
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13th November 2008, 08:50 | #6968 | Link | |||||
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Yes, why not! Such samples never hurt... |
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13th November 2008, 12:55 | #6969 | Link | |
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Any plans on implementing it, or do you intentionally keep these tracks at 5.1 only? |
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13th November 2008, 15:34 | #6970 | Link | |
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Thank you! Will do. |
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13th November 2008, 16:01 | #6971 | Link | |
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So, when and how can I get this changes in order to convert my track? |
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13th November 2008, 19:35 | #6972 | Link | |
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I googled the movie and some people were having trouble with the HD-DVD player freezing on chapter operations with the particular movie. This may very well explain the problems they were having. Last edited by Jeff Flowerday; 13th November 2008 at 19:43. |
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13th November 2008, 19:42 | #6973 | Link |
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What about volume normalization, is there a chance we might see that in eac3to? Sometimes tracks that are downmixed from multichannel to stereo are rather low on volume.
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13th November 2008, 21:33 | #6974 | Link | |
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@Madshi
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13th November 2008, 22:30 | #6975 | Link |
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before few month i reported that:
http://forum.doom9.org/showthread.ph...14#post1158014 Sonic Audio Decoder version 5.0.0.203 (from Sonic CineVision 2.5.0) doesn't decode DTS-HD extension and decodes the DTS core only and that version 4.3.0.169 (from Sonic CineVision 2.0.2) is the last one that decodes the DTS-HD extension. now, Sonic CineVision 2.6.1 is out, it includes version 4.3.0.230 of the decoder. Sonic has strange version numbering: Sonic CineVision 2.0.2: Sonic Audio Decoder version 4.3.0.169 Sonic CineVision 2.5.0: Sonic Audio Decoder version 5.0.0.203 Sonic CineVision 2.6.1: Sonic Audio Decoder version 4.3.0.230 maybe, only the last 3 digits are important and they are the build number. anyway, the new version 4.3.0.230 doesn't work with the DTS-HD extension too. btw, while testing the new version 4.3.0.230 of Sonic i found out something that looks like a bug in eac3to: the same DTS core decoded with Sonic in eac3to and GraphEdit produce different output (not byte by byte indentical), which doesn't seem right. |
13th November 2008, 23:59 | #6976 | Link |
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I have a DTS hi-res 7.1 track @ 2084 kb/s I am about to remux for BD playback, however my HT setup is only 5.1. Is the extra kb/s only assigned to the rear surround channels or would there be "hi res" data on the other 6 channels as well?
Basically will I be getting just the core because I have a 5.1 setup? I have an HD audio amp and it is hooked up via HDMI. Also, when demuxing a DTS HD or DTS HR track should the output be ".dtshd/hr" and would setting it as .dts write a new dts track and leave out the HD data? Thanks. |
14th November 2008, 00:20 | #6978 | Link | |
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I was only concerned with the fact that my setup is 5.1, and the DTS HR track I have is 7.1... and was I going to get the extra HD data. Thanks. |
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14th November 2008, 02:09 | #6979 | Link |
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Madshi, this may have been asked before so please excuse me if that is the case...
Since Nero 9's filters are once again accessible (as opposed to Nero 8's being locked) through direct show, do you have any plans to incorporate usage of these filters into EAC3to? I would love to be able to upgrade my version of Nero. I am still using Nero 7, simply because I want to retain full use of your fantastic application. It just seems a shame to not be able to replace an entire multimedia suite due to this. |
14th November 2008, 06:24 | #6980 | Link |
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Hey Madshi,
I was wondering if you could add an option to downsize from 8 channels to 7 channels in addition to downsizing from 8 to 6 by combining the Lsr(BL) and Rsr(BR) into Cs(BC?). When combining this option with extracting to "wavs" would take an 8 channel 7.1 stream and downsize it to 6.1 and output 7 separate wav files which you can then manually feed into a DTS-ES encoder to create a 6.1 DTS-ES track. What do you think? Last edited by lithiumus; 14th November 2008 at 06:35. |
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