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Import RAW Audio Showing Combined File, Trying To Get Isolated Track

New Here ,
Aug 30, 2020 Aug 30, 2020

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I recorded a session with myself and someone else on a Zoom H4N with our Shure SM7B microphones each plugged into it and recording two separate MTR files in Mono each (WAV, 16 Bit / 44.1 Hz) into a SanDisk 32GB memory card. The H4N said it was recording fine the whole time (we were continually checking) but then when I put the memory card in to check on my computer to get the files, it wasn’t playing each file. The files on the memory card were saying one was 1GB and the other was 0KB. But in Disk Utility, it says there's 2GB taken up on the card.

 

For the 1GB file, I was able to get it to work. However, the only time I can hear or get close to the 0KB file is when I import the RAW card image copy into Audition, it brings it in as one combined file of the two recordings. So it'll cut after a few seconds between each file. I need to get a separate proper isolated audio file of the other track.

 

The settings below are what get that combined file:

Sample Rate: 44.1 Hz 
Channels: 1
Encoding: 16-bit PCM 
Byte Order: Little-Endian (Intel Bye Order)


Start Byte Offset: 0 bytes 

 

It is pulling from the DMG of the memory card, so that may be why it's drawing both (and since that 0B file seems to have something otherwise for regular importing). I tried making another image copy of the memory card but with deleting the other file (the 1GB) but it still brings in both files still.

 

However, based on being able to clearly hear the audio in the combined version, I know it's in there somewhere. I just don't know how to locate it or import it

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Mentor ,
Aug 31, 2020 Aug 31, 2020

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Is the combined file stereo or mono?

"The files on the memory card were saying one was 1GB and the other was 0KB. But in Disk Utility, it says there's 2GB taken up on the card."

It sounds to me like the 2nd wav file didn't get closed properly which means that while the space has been used on the USB drive the header file of the wav file has not been written to the file.

This can probably be fixed by someone with a hex editor and some patience.

You would need to isolate the raw audio from the used disk space (there is probably an existing utility for this somewhere) and adding the wav header (based on the wav header of the existing audio).
Don't even think about doing this without making several image copies of the USB drive.

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Community Expert ,
Aug 31, 2020 Aug 31, 2020

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Zoom's H4N firmware has always struck me as a little strange - and bugged. They even admit as much. There was a firmware update in 1995 that most people aren't aware of that gets it up to v. 1.90 and it's worth applying that if you haven't already done so.

 

Zoom H4N firmware update to 1.90 

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New Here ,
Aug 31, 2020 Aug 31, 2020

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The combined file is mono unfortunately, but even if it weren't it would be almost impossible to cut it up into a regularly flowing track anyway (it's a bit jumpy) so the regular isolated track is needed.

 

I have made several copies of the drive/card, but unfortunately I don't know anyone with a hex editor - nor do I do it myself 😞

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Mentor ,
Aug 31, 2020 Aug 31, 2020

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If you want to send it to me I will have a try - no promises
I will have to convert your DMG to an ISO first because I'm not on a Mac (mine usually come with a coke and fries)

Send it to info@aatranslator.com.au
It is 3am here so don't expect anything tonight even so it may take a day or two but again no promises

I hope this is important

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New Here ,
Aug 31, 2020 Aug 31, 2020

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Ok, I have sent it over via WeTransfer but no pressure. It is important to me but if it's too time-consuming, again I have no expectations of you. Grateful for you to even offer, and to have even replied to the post in general. 

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Mentor ,
Aug 31, 2020 Aug 31, 2020

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I have just tried to convert the dmg to an iso or img but it says that the dmg is damaged.
Being on a PC I can't do anything with the dmg

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New Here ,
Sep 01, 2020 Sep 01, 2020

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Ah ok, weird. Thanks for letting me know.

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