Multichannel wav file export is cut

[Gale Andrews]

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

What do you mean by "add a track"? If you want to make a 7.1 file instead of 5.1, add the tracks in Audacity.

Have you tried to see if the file is under 2 GB if exported as FLAC?

If you must make a PCM file larger than 4 GB you must use RF64, because the WAV specification does not allow more than 4 GB. RF64 is lossless PCM, but it should not use WAV extension, so it has RF64 extension instead. See my post for how to export as RF64.


Gale

[steve]

Many HD movies include this type of track.

None. HD movies do not use WAV files.

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

As Gale suggested you can try RF64.

PCM is a form of encoding, not a file format. The 4GB limit applies to the WAV file format, not to PCM encoding.
RF64 is a file format that can contain PCM encoded audio data and the file size may exceed 4GB.

FLAC is lossless but has a size limit of 2 GB on Windows

Thanks Gale. I'd forgotten about that size limitation, though I believe the limitation only applies to encoding on Windows. We had a user a few years ago that produced a 4 GB Flac file on a Linux machine and confirmed that it played correctly in WinAmp on Windows.

[MIMMO61]

Excuse me.
I expressed myself badly, I mean how do you export a multichannel pcm track from Audacity, to muxing (add) this track to a hd video?

[MIMMO61]

None. HD movies do not use WAV files.

Sorry
I meant to say, linear PCM.

This is the medianfo a Blu-ray

Code: Select all

General
ID                                       : 0 (0x0)
Complete name                            : F:BDMVSTREAM\00004.m2ts
Format                                   : BDAV
Format/Info                              : Blu-ray Video
File size                                : 21.4 GiB
Duration                                 : 1h 45mn
Overall bit rate mode                    : Variable
Overall bit rate                         : 29.1 Mbps
Maximum Overall bit rate                 : 48.0 Mbps

Video
ID                                       : 4113 (0x1011)
Menu ID                                  : 1 (0x1)
Format                                   : MPEG Video
Format version                           : Version 2
Format profile                           : [email protected]
Format settings, BVOP                    : Yes
Format settings, Matrix                  : Custom
Format settings, GOP                     : M=3, N=12
Codec ID                                 : 2
Duration                                 : 1h 45mn
Bit rate mode                            : Variable
Bit rate                                 : 21.8 Mbps
Maximum bit rate                         : 35.0 Mbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.439
Time code of first frame                 : 00:59:59:00
Time code source                         : Group of pictures header
Stream size                              : 16.1 GiB (75%)

Audio #1
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : PCM
Format settings, Endianness              : Big
Format settings, Sign                    : Signed
Muxing mode                              : Blu-ray
Codec ID                                 : 128
Duration                                 : 1h 45mn
Bit rate mode                            : Constant
Bit rate                                 : 4 608 Kbps
Channel(s)                               : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Stream size                              : 3.40 GiB (16%)

[Gale Andrews]

how do you export a multichannel pcm track from Audacity, to muxing (add) this track to a hd video?

Audacity just exports the file as you have done it already. You have to use a Blu-Ray authoring program to make the Blu-Ray disc. We can't help you with that here.

As I understand it, but don't take it as definitive, 5:1 LPCM channel mapping on Blu-Ray is L R C LS RS LFE - but most authoring programs will remap from the 5:1 WAV mapping of L R C LFE LS RS. Therefore the MediaInfo readout is not the channel mapping order - it always groups the positions Front then Side.


Gale

[MIMMO61]

Thank you for this information.
Now I have the ideee clearer on this concept.

[Gale Andrews]

FLAC is lossless but has a size limit of 2 GB on Windows

Thanks Gale. I'd forgotten about that size limitation, though I believe the limitation only applies to encoding on Windows. We had a user a few years ago that produced a 4 GB Flac file on a Linux machine and confirmed that it played correctly in WinAmp on Windows.

Yes I "think" it is only a problem with the FLAC encoder - and they seem to think it only "priority 7" to fix it: http://sourceforge.net/p/flac/bugs/306/ .

But I've seen some reports that > 2 GB FLAC files encoded on Linux won't play in Windows Media Player where smaller ones will (with the appropriate DirectShow filter installed).

So until I try it myself I won't document exactly what works and what doesn't.


Gale