Create Large 5.1 FLAC

2007-08-31 12:44:41

Ok, here's the situation... I've 6 48khz 24bit mono wave files (they are quite big, is the sound from a film), and I wanna create a 5.1 flac from them... is this possible?

I've tried to do the following:
- merge them with wavewizard (WaveFmtEx output, ignore size in header)
- set manually the Channel Mask to 0x3F
- encode with flac 1.2.0 with this command: "flac infile.wav --best --ignore-chunk-size" (I use this switch because otherwise the encode doesn't even start, I think cause the wave hasn't a size in the header)

Doing these steps results in a incomplete file, cause the encoder gives me: "ERROR: got partial sample"

Any idea?

Create Large 5.1 FLAC

Reply #1 – 2007-08-31 20:51:24

doesn't the format hve to be WAVEFOREMATEXTENSIBLE to have a channel mask?


p.s. if you do the same process with a very short clip and it doesn't work, upload/host it and I can take a look.

Create Large 5.1 FLAC

Reply #2 – 2007-09-01 01:09:58

Exactly, that's what I meant with WaveFmtEx...
With smaller files the encode seems to work good, so I thought the problem was cause by some sort of "error" (or corrupt data) in the bigger files, by they all encode ok when I take them one by one...

Create Large 5.1 FLAC

Reply #3 – 2007-09-01 14:25:12

Maybe you can reproduce it:
- create a long (at least 2 hours) 24 bit 48 khz wave file
- mux 6 of these files with wavewizard
- try to flac it

Create Large 5.1 FLAC

Reply #4 – 2007-09-02 19:56:13

hmm, is the file >4GB?  that will not work either since wav does not support files that big.  if it is using zero chunk sizes as a hack, that could be made to work with --ignore-chunk-sizes but flac 1.2.0 does not support it.

Create Large 5.1 FLAC

Reply #5 – 2007-09-03 09:55:37

Currently, it may be possible to create a large multichannel FLAC file by following the steps:

1. use Windows Media Mono to Multichannel Wave Combiner 9 Series
This command line tool will combine 2, 6 or 8 mono WAV files into an audio-only AVI file that can be used as a source with the Windows Media Encoder 9 Series.
2. use VLC to transcode AVI file to FLAC. If needed, see also Advanced streaming using the command line.

Create Large 5.1 FLAC

Reply #6 – 2007-09-04 00:54:30

I've already tried --ignore-chunk-size, but it results in that error described in the first post...
Now I'm trying a new approach to the thing, using raw samples instead of a wav as source... eac3to can successfully complete the encode in this way...

Edit: success!!!