Subject:problems saving in IMA ADPCM format

Posted by: theagenda

Date:9/26/2007 3:21:51 PM

For my job, I need to convert stereo source (44.1k 16 bit) audio to compressed ADPCM 16 bit mono wavs, at either 8k or 11k. In both SF8 and SF9, the resulting file (after save as) has a small amount of extra audio tagged onto the end of the file - about 50 ms.

You can't remove it manually, as when you hit save, it reappears.

Any insight or suggestions?

Subject:RE: problems saving in IMA ADPCM format

Reply by: ForumAdmin

Date:9/27/2007 6:50:50 AM

What is the status of the "Ignore fact chunk when opening compressed WAV files" option in Options->Preferences->General?

J.

Subject:RE: problems saving in IMA ADPCM format

Reply by: theagenda

Date:10/3/2007 2:06:25 PM

Currently it is checked (enabled).

Subject:RE: problems saving in IMA ADPCM format

Reply by: ForumAdmin

Date:10/13/2007 3:45:59 PM

Uncheck the "Ignore fact chunk" pref. For this format, you do want Sound Forge to pay attention to the fact chunk.

The fact chunk indicates the exact number of audio samples in the file. Some codecs leave extra data at the end of the very last decode buffer, which will be excluded when Sound Forge uses the fact chunk to figure out how long your file truly is.