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1st December 2007, 16:26 | #1801 | Link |
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Can anyone offer any tips on converting PCM? I've always managed to avoid it so far but I now have a BluRay (Open Season) where the only English audio is lossless PCM.
eac3to accepts the .pcm input and completes the conversion but the resulting ac3 file has a really loud buzzing noise. I've tried forcing both Nero and Sonic filters with no change. Here's the eac3to output: Code:
H:\>"C:\Program Files\Audio\eAC3to\eac3to.exe" "H:\os.pcm" "H:\os.ac3" This might be a RAW/PCM file. Trying to figure out the details. This will probably take a while. Please be patient... The RAW/PCM file seems to be big endian. The RAW/PCM file seems to have a bitdepth of 16 bits. The RAW/PCM file seems to have 6 channels. RAW/PCM, 5.1 channels, 0:03:00, 16 bits, 48khz This is probably a Blu-ray PCM track. Will remap channels accordingly. Reading RAW/PCM... Swapping endian... Remapping channels... Encoding AC3... Creating/writing file "H:\os.ac3"... |
1st December 2007, 19:12 | #1804 | Link |
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well you didnt mention that, you only spoke of pcm conversion in general. and afaik conversion to flac doesnt cause these problems (at least not for me yet) thats why I mentioned it.
I wanted to convert the DTS-HD hi-res track from basinc instinct blu-ray to flac, but im not sure if everything went ok. as advertised the track is supposed to be 5.1, but eac3to said something of 7 channels and made 6.1 out of it or something like that. heres a 10mb sample: http://www.sendspace.com/file/132bk5 the original track size (24-bit) is: 2.72 GB, the flac size is 3.75 GB Last edited by Thunderbolt8; 1st December 2007 at 20:41. |
2nd December 2007, 12:31 | #1807 | Link | |
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Quote:
Interestingly, on my German Curse of the Black Pearl the English PCM track is only 16bit! I've compared the two tracks. The 16bit track from my German disc was downconverted from the 24bit track by using some kind of dithering, maybe even noise shaping. Normally this is a good method to do the downconversion to 16bit. But since 99% of the track were only 16bit to begin with, the dithering harms more than it helps. I've compared the FLAC files of the 2 tracks. And actually the 24bit FLAC file from the English 24bit PCM track is *smaller* by about 10% compared to the 16bit FLAC file from the English 16bt PCM track from my German disc. Very strange. Seemingly the dithering noise makes compression more difficult. Version v2.08 now has an (undocumented) new switch "-check16bit" with which you can force eac3to to check whether a 24bit decoded datastream only contains 16bit of real information. You can use it on PCM and WAV input tracks. |
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2nd December 2007, 12:36 | #1809 | Link | |
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You might also want to test WAV or FLAC writing instead of AC3. I'm not trying to convince you not to use AC3. But trying WAV or FLAC would belp us finding out where the problem is located. If the AC3 file is noisy but the WAV and FLAC files sound correct then the problem occurs during AC3 encoding. If the WAV and FLAC files have the same noise as the AC3 encoding, then the problem must be in the reading or interpretation of the PCM data. |
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2nd December 2007, 12:38 | #1810 | Link | |
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2nd December 2007, 13:01 | #1811 | Link | ||
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Code:
eac3to.exe in.pcm out_20.pcm -down20 Quote:
That's correct. Every input "module" converts the raw audio data to little endian and the default WAV channel order. Since you chose "PCM" as output format, eac3to has to convert endian and reswap channels for output again. |
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2nd December 2007, 13:38 | #1813 | Link |
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Hi, i have laso a problem with my audio file. My Source file is a 5.1 DTSHD Track from a BluRay Disc.
xxxxxxxxxx\eac3to.exe" "file.dtshd" "file.ac3" -640 DTS Master Audio, 5.1 channels, 24 bits, 48khz Decoding with DirectShow (Sonic Audio Decoder)... DirectShow reports 5.1 channels, 24 bits, 48khz Encoding AC3... Creating/writing file "file.ac3"... than he creates a 163kb *.ac3 big file and nothing else happens ( I waited about 1 hour, but filesize did not change) I am using the latest version of eac3to Cu |
2nd December 2007, 13:57 | #1815 | Link | |
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I can only guess that your DTS-HD file is faulty. Which movies does it come from? With which tool did you extract it? |
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2nd December 2007, 13:58 | #1816 | Link | |
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