AC3 to 6 Channel Wav

[RabidSmurf]

Every utility i've tried changes the length of the resulting WAV file, this is not good because i am converting this WAV into a WMA for combining with a re-encoded WMV-HD

Headache for some reasons converts a 2 hour and 32 minute AC3 to a 1:22 Minute WAV

Besweet converts it to a 2 hour 4 minute wav (The audio just stops at 2 hours 4 minutes)...

What am I doing wrong? Please help

[poisondeathray]

If this is a continuation of your other thread ,

https://forum.videohelp.com/topic362417.html#1927004

If recall, WAV files have a 2gb file size limitation. You can cut your AC3 , or WAV file with an audio editor (e.g. audacity)

You can do it in segments, and join with avisynth later. It might look something like this: e.g.

a=DirectShowSource("1.wav",video=false)
b=DirectShowSource("2.wav",video=false)
a+b

Then plug that into WMNicEnc

[RabidSmurf]

the .wav file is coming back over 7GB i don't think this is the problem. Unless it's 2GB of audio content being the limitation, man this is turning into a nightmare ... hah...

Thanks for all your help

[poisondeathray]

ok then you might try foobar2000 (you might need the ac3 plugin) to convert to wav, other options are audacity and eac3to

run you ac3 thru ac3fix and/or delaycut just to make sure it's not an error with the ac3 audio causing the encoder to abort the process

[Midzuki]

Try decoding your multichannel .AC3 with valdec.exe

[C:\]
=>valdec

Valib decoder
=============
Audio decoder/processor/player utility

This utility is a part of AC3Filter project (http://ac3filter.net)
Copyright (c) 2006 by Alexander Vigovsky

Usage:
  valdec some_file [options]

Options:
  (*)  - default value
  {ch} - channel name (l, c, r, sl, sr)

  output mode:
    -d[ecode]  - just decode (used for testing and performance measurements
    -p[lay]    - play file (*)
    -r[aw] file.raw - decode to RAW file
    -w[av] file.wav - decode to WAV file
    -n[othing] - do nothing (to be used with -i option)

  output options:
    -spk:n - set number of output channels:
      (*) 0 - from file     4 - 2/2 (quadro)
          1 - 1/0 (mono)    5 - 3/2 (5 ch)
          2 - 2/0 (stereo)  6 - 3/2+SW (5.1)
          3 - 3/0 (surround)
    -fmt:n - set sample format:
      (*) 0 - PCM 16        3 - PCM 16 (big endian)
          1 - PCM 24        4 - PCM 24 (big endian)
          2 - PCM 32        5 - PCM 32 (big endian)
                 6 - PCM Float

  format selection:
    -ac3 - force ac3 (do not autodetect format)
    -dts - force dts (do not autodetect format)
    -mpa - force mpa (do not autodetect format)

  info:
    -i    - print bitstream info
    -hist - print levels histogram

  mixer options:
    -auto_matrix[+|-] - automatic matrix calculation on(*)/off
    -normalize_matrix[+|-] - normalize matrix on(*)/off
    -voice_control[+|-] - voice control on(*)/off
    -expand_stereo[+|-] - expand stereo on(*)/off
    -clev:N - center mix level (dB)
    -slev:N - surround mix level (dB)
    -lfelev:N - lfe mix level (dB)
    -gain:N - master gain (dB)
    -gain_{ch}:N - output channel gain (dB)

  automatic gain control options:
    -agc[+|-] - auto gain control on(*)/off
    -normalize[+|-] - one-pass normalize on/off(*)
    -drc[+|-] - dynamic range compression on/off(*)
    -drc_power:N - dynamic range compression level (dB)
    -attack:N - attack speed (dB/s)
    -release:N - release speed (dB/s)

  delay options:
    -delay_units:n - units in wich delay values are given
          0 - samples (*) 2 - meters      4 - feet
          1 - ms          3 - cm          5 - inches
    -delay_{ch}:N - delay for channel {ch} (in samples by default)

HTH.


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[RabidSmurf]

didn't see the latest suggestions, will try these thanks.

[RabidSmurf]

eac3to creates the wav file with a length of 1 hour 22 minutes (same as headache).

There has to be a reason for this.... I'll try foobar2000, for the other idea regarding valdec I think I need more information in order to try this (I am kind of a n00b).

EDIT: Tried Foobar2000 it too creates the wav file with a length of 1 hour 22 minutes...

Since this is a commonality across more then one utility... there has to be a setting or something

Hope someone out there knows the answer...

Thanks for all the help guys it's much appreciated.

[RabidSmurf]

I have tried valdec as well...

The output wav file is only 1 hour 9 minutes... there has to be some compression happening or something..

Valdec command i used was:

valdec "f:\audio encoding\name.ac3" -w Test.wav -spk:6 -fmt:1

Anyone have any ideas why it keeps changing the length? the length should 2 hours 32 minutes and 13 seconds (to match that of the movie).

[Soopafresh]

Try poisondeathray's ac3fix suggestion. I've had good luck demuxing with Tranzcode. Download the following and run the batch file in the same folder as your ac3 file.

tranzcode_0.40_beta.rar

[RabidSmurf]

Hey guys I appreciate all your answers,

It looks like this is a size limitation after all.

The size limit is 4GB this lines up with all the wav length times I've seen thus far. Looks like the only solution is to split the ac3 file then recombine using WMNicEnc..

Unless someone has a better idea for converting AC3 to WMA (without losing 5.1 surround).

Thanks for all the help guys

[guns1inger]

You don't have your computer specs in oyur profile, but by chance is your HDD formatted as FAT32 ?

[RabidSmurf]

FAT32? absolutely not...

At any rate, I am going to use delaycut, to cut my AC3 in half and use poisons original suggestion of using avisynth to recombine whilst encoding to WMA 5.1

Anyone see any flaws in this logic, or a better way to do this?

[RabidSmurf]

Ok problem is resolved

Solution:
WAV files have a size limit of 4GB.. Split the AC3 in half using delaycut, encode both halves to two seperate 6 channel wav's using headache, use Poisons script (second post) and feed that into WMNicEnc to create your 5.1 WMA File.

[Midzuki]

Ok problem is resolved

Solution:
WAV files have a size limit of 4GB..

Split the AC3 in half using delaycut, encode both halves to two seperate 6 channel wav's using headache, use Poisons script (second post) and feed that into WMNicEnc to create your 5.1 WMA File.

Thanks for confirming the actual origin of your format-conversion problem.

Now, I can think of another solution: open the ac3 file with the NicAudio Avisynth plugin,
and load the proper .AVS into WMNicEnc.


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