[FFmpeg-devel] Develop Reader for National Instruments: TDMSformat

Matthew Einhorn moiein2000 at gmail.com
Fri Feb 10 17:51:26 CET 2012

On Fri, Feb 10, 2012 at 10:15 AM, George <george at mantlellc.com> wrote:
> Matt;
> Thank you for the reply.  My application is data logging from a large coil which picks up telluric events from the earth through the magnetic field.  I'm trying to use National Instruments analog to digital module NI 9232 and DAQ chassis which digitizes and streams the data WiFi (802.11G) to my laptop in remote field areas.

Sounds very cool!

> NI data logging method picks up the streaming data, logging it into TDMS via Signal Express or Lab View proprietary software.  I need to get this data into audio stream so I can use simple shareware like Audacity and Spectrum to view it in the field.  I can NOT generate data which is only useful via propriatary software, and NI only allow output to Excel or ASCII, which seems obscure to me.  My application must be ONE STEP.  Read the streaming data via Audacity/Spectrum and save to file.

Actually, if you have access to LabVIEW then you can do the whole
thing in there directly because within LabVIEW you can save date to
.wav files (http://zone.ni.com/reference/en-XX/help/371361H-01/lvpict/sfilewrite/).
So, if you log data from LabVIEW then you can simply save the data as
a .wav file, but if you go through signal express then you can simply
write a LabVIEW VI that reads the tdms data and saves it to a wav
afterwords (it does add an extra step though). This would be _much_
simpler then writing your own tdms reader. If you don't know how to do
this in LabVIEW I can show you, but we should probably do it off the
mailing list because it's not ffmpeg related.

Would this solve it?


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