topic Re: Read large wav files in LabVIEW

Re: Read large wav files

miklovicd — Fri, 01 Mar 2019 04:30:35 GMT

I am having trouble reading .wav files greater than 1 GB. It seems the position offset is not offsetting - I keep getting the same set of points even though the offset out is incrementing. This happens no matter how many samples are read - even a small number like 256. No problem for files less than 1 GB. I am running 64 bit labview with 32 GB ram.

Re: Read large wav files

GerdW — Fri, 01 Mar 2019 06:46:38 GMT

Hi miklovicd,

so there is a problem with your VI - but you don't show that VI…

Mind to attach some code? (No "images of code", real code please!)

Re: Read large wav files

Ben — Fri, 01 Mar 2019 13:46:50 GMT

@miklovicd wrote:

I am having trouble reading .wav files greater than 1 GB. ... No problem for files less than 1 GB. I am running 64 bit labview with 32 GB ram.

Look at the function you are using to read the data. While the low level file functions in LV do support files with offsets that can be described by an I32, the higher level file (Read Delimited Spreadsheet.vi for example) functions do not.

Ben

Re: Read large wav files

Bob_Schor — Sun, 03 Mar 2019 20:35:00 GMT

I did a Web search for Read large WAV files. There is some discussion of this, including a note that WAV files are limited to 4GB because they use a U32 for the File Size header, but if you are using LabVIEW 64, you (optimistically) should not have a problem.

But you also say you can't reliably "read in chunks", which seems to be the solution others have used successfully. So it's either Hardware, Bad Data, or Software. We can eliminate the first two -- can you "play" your sound file through your PC using Media Player or something similar alright? If so, that leaves Software -- for help with that, attach your VI (don't bother attaching a non-executable picture).

Bob Schor

Re: Read large wav files

miklovicd — Tue, 29 Oct 2019 00:22:44 GMT

Its none of this. Turns out labview just doesn't support wav files over 2 GB.

Re: Read large wav files

billko — Tue, 29 Oct 2019 19:34:42 GMT

@miklovicd wrote:

Its none of this. Turns out labview just doesn't support wav files over 2 GB.

That's the first time I've heard of that. Are you sure it's not a case of what Ben discusses above? Anyone know of a 2 GB limit on a wav file (that doesn't involve a memory/file/OS issue)?

Re: Read large wav files

Ben — Tue, 29 Oct 2019 19:51:09 GMT

@miklovicd wrote:

Its none of this. Turns out labview just doesn't support wav files over 2 GB.

Wild guessing time!

Are you using he file functions found under the

Graphics & Sound >>> Sound >>> Files palette

that invokes a dll with input values that are an I32 ?

If so yes, an I32 is limited to a max of 2G.

Ben