Audacity Forum

Good day

I can not make the export of multi-channel wav file.
I use Windows 7 64bit sp1 and Audacity 2.0.5

I uploaded the file successfully with duration of about 2 hours and 43 minutes, but the file is cut with a duration of about 39 minutes, I can not figure out where I'm wrong.

Source Files (2h 43')



Exported file (39')


Can you kindly give me some advice?

Yours sincerely thank

MIMMO61 wrote:I can not make the export of multi-channel wav file.

What format are trying to export as?
The maximum file size for a WAV file is 4 GB (http://en.wikipedia.org/wiki/WAV#Limitations). 6 tracks at 48 kHz sampling rate, 16 bits per sample for 2 hours and 43 minutes will be a little over 5 GB, so too big for a WAV file.

The sound source is the trace of a movie.
In fact, by exporting in AC3 format I have not found any problem for the duration, the problem is only in the limit of file size.
So I ask how can I solve this limit in Audacity.

Yours sincerely thank

You could select the first half of the project and export that as one file then select the other half and export it as a second file (File > Export Selection).
Alternatively use some other format such as Flac, AC3, Ogg, MP3 ....

Unfortunately, I must have a unique file format multichannel PCM, in order to preserve the high quality.

If the author of the program could turn the limit of 4 GB would be a great thing.

MIMMO61 wrote:If the author of the program could turn the limit of 4 GB would be a great thing.

The 4 GB limit is not imposed by Audacity. It is a limit of WAV format (see the wikipedia link that I posted).
Flac format is lossless.

Then FLAC exceed 4 gb?
and is equivalete to PCM (wav)?

There is an article here about Flac: http://en.wikipedia.org/wiki/FLAC

In their wisdom Microsoft decided to not support Flac, but support for Flac in Windows Media Player (and other Windows audio programs) can easily be added by installing the Directshow Filters: http://www.xiph.org/dshow/

The home page for Flac is here: https://xiph.org/flac/

MIMMO61 wrote:Then FLAC exceed 4 gb?
and is equivalete to PCM (wav)?

FLAC is lossless but has a size limit of 2 GB on Windows: http://manual.audacityteam.org/o/man/fi ... ml#compare .

16-bit FLAC will be about half the size of 16-bit WAV, so in terms of total audio length you can fit into the file, FLAC will have about the same length limitation as WAV.

So unless you set FLAC compression to maximum 8 (click "Options..." in the file export dialogue) and are really lucky, your file will be too large. Maximum compression will take a great deal longer to complete and will probably only save a few MB's.

If the FLAC file exceeds 2 GB, try exporting as RF64 which is essentially PCM audio without the length limitation. Choose "Other uncompressed files" when you export, click the "Options..." button, choose "RF64 (RIFF64)" Header and choose the bit depth in "Encoding".

Foobar2000 and VLC should play RF64. I don't know of any solution to make Windows Media Player do so.



Gale

Excuse my insistence

But how do I add a track to pcm multichannel larger than 4 GB?

Many HD movies include this type of track.

thanks