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Topic: IMA ADPCM problem? (Read 3335 times) previous topic - next topic
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IMA ADPCM problem?

Hi,

I'm encoding IMA ADPCM's (8khz, 4 bit, mono), to put as ringtones on my phone, but each time some silence & extraneous transients are put in at the end of the file (see screenshot).  Is there a way of removing this?  I've tried editing the binary on the hexadecimal level but this then renders the file unplayable on my phone but can still be played back on my PC.  Maybe I just haven't edited the hex values correctly?  This is driving me nuts, any help is greatly appreciated.

Thanks!

IMA ADPCM problem?

Reply #1 –
Maybe it's a wrongly attached or generated info-tag? Look at the adpcm.wav in hex viewer and compare visually sound "data" with your "some silence & extraneous transients".
Can you remove this additional "garbage" by cutting it out with Sound Forge?
 

IMA ADPCM problem?

Reply #2 –
What tool are you using to encode the ADPCM files? Maybe you could try converting from .wav to IMA-ADPCM with something else (SoX for example) instead of what you are currently using.