Technical Support
"Conversion stream cannot be opened (ACM error 512)" solution
Audio Converter uses audio compression manager (ACM) of the Windows operating system to re-sample audio (changing the sample-rate) and to change the number of bits per sample. ACM supports only a limited set of sample-rates:
8,000 Hz
11,025 Hz
12,000 Hz
16,000 Hz
22,050 Hz
24,000 Hz
32,000 Hz
44,100 Hz
48,000 Hz
All of those sample rates are supported with 8 or 16 bit (per sample) and Mono or Stereo.
Converting to CCITT A-Law/CCITT u-Law compressed Wav
NOTE: This is not required if you have version 8.05 (currently not available as a Demo version).
To convert to a CCITT A-Law/CCITT u-Law compressed Wave, the source must have 2 channels (Stereo) and "sample rate" and "bits per sample" of source and output must match. Otherwise you will get a ACM 512 error.
For example, to convert a MP3 (44kHz, 16bit, Stereo) to Wave (CCITT A-Law; 8kHz, 8bit, mono), it is necessary to convert the MP3 first to Wave (PCM; 8kHz, 8bit, stereo) and then to the CCITT A-Law compressed Wave.
Converting 24 bit AIFF files
Many AIFF files use 24 bit samples. Because ACM only supports 8 and 16 bit samples, the program will give an ACM 512 error.
The solution is to convert to a lossless WMA first and then convert the WMA to the desired format. This works because the WMA codec can re-sample to 16 bit.
You should use this settings to encode a temporary lossless WMA (CD quality).
Back to Technical Support Home
Do you think this article is useful? Any gripes or comments? support@audioconverter.info
|
