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Gale Andrews
- Quality Assurance
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by Gale Andrews » Thu Jan 07, 2010 12:47 am
Nils Jagdfeld wrote:I have a question about the wav-format. I would need a ACM-coded wav-format for a speech software called emu. Older versions of this software can only read ACM-coded wav files. Is it already implemented, or is it possible to implement this format. It also would be great of one can specify the export-quality (such as 16 bit, 44,100 HZ, mono/stereo).
stevethefiddle wrote:As far as I'm aware, ACM is an obsolete compressed audio format from Microsoft that is not supported by Audacity. I don't know of any programs that support ACM.
If I'm correct about it being obsolete then I would think it unlikely that support for it will be added in the future.
Do you mean ADPCM? Audacity should support export to WAV with either IMA, Microsoft or G721 encodings of ADPCM. In the Export dialogue, choose "Other Uncompressed Files" then hit Options. ADPCM is always 4-bit. Sample rate is chosen bottom left of the Audacity screen.
Gale
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Nils Jagdfeld
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by Nils Jagdfeld » Thu Jan 28, 2010 7:11 pm
Sorry for my delay. Thank you Gale for your support. I found the relevant Options, following your description.
What I´ve meant was: In a software like cool edit, it is possible to discriminate between two types of wav files. The first is called 'Windows PCM (wav)', the second 'ACM Waveform (wav)'. The new EMU version works with both types. Now, we´ll use audicity for our audio preprocessing.
Nils
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Gale Andrews
- Quality Assurance
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- Joined: Fri Jul 27, 2007 12:02 am
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by Gale Andrews » Fri Jan 29, 2010 12:20 pm
Nils Jagdfeld wrote:What I´ve meant was: In a software like cool edit, it is possible to discriminate between two types of wav files. The first is called 'Windows PCM (wav)', the second 'ACM Waveform (wav)'. The new EMU version works with both types. Now, we´ll use audicity for our audio preprocessing.
I see, so ACM is the old Windows Audio Compression Manager multimedia framework which has been superseded by DirectShow. The "ACM format" choice in Cool Edit lets you choose a variety of formats such as MS ADPCM, IMA ADPCM, A-Law, U-Law wrapped in a WAV heading. So for example if in Audacity you chose "Other Uncompressed Files" then clicked Options and chose IMA ADPCM with WAV header, it should work even in the old EMU version.
Some of those Cool Edit ACM options like wrapping MP3 inside WAV would require you to use "Custom FFmpeg Export" in Audacity:
http://manual.audacityteam.org/index.ph ... tallffmpeg
However not all combinations of formats and codecs have been tested in Custom FFmpeg Export, and it isn't expected that all would work due to limitations in the FFmpeg library.
Gale
