Line-In to M4A with River Past Audio Capture, Line-In2M4A recording

What is M4A?

Because of its exceptional performance and quality, Advanced Audio Coding (AAC) is at the core of the MPEG-4, 3GPP and 3GPP2 specifications and is the audio codec of choice for Internet, wireless and digital broadcast arenas. AAC provides audio encoding that compresses much more efficiently than older formats, such as MP3, yet delivers quality rivaling that of uncompressed CD audio.

To encode MPEG-4 audio, you need to have River Past MPEG-4 Booster Pack in addition to your audio software.

Launch River Past Audio Capture

Once River Past Audio Capture is installed properly, launch Audio Capture.

Set Sound Card Settings

Click on the toggle to the left of "Record from". The panel expands. Make sure the "Audio Device" combo box shows your sound card correctly, and select "Line in" in the "Port" combo box.

Different sound card may have different name for the line-in port.

Set Volume

Click on the toggle to the left of "Format". The panel expands. Select "AIF - Audio Interchanged File Format" as the File Type.

The "Volume" setting can be adjusted during the recording later.

Select output format

Use the setting panel on the bottom of the window to control the output format. Click on the toggle to the left of the "Format" label to expand the panel. Select "M4A - MPEG-4 Audio" as the "Audio Type".

You can change the sample rate, channel (stereo or mono) and bits/sample, and bitrate.

Note: To convert to MPEG-4 audio, you must have River Past MPEG-4 Booster Pack installed.

Set Output File

Click on the toggle to the left of "Record to". The panel expands.

Click on the browse button to bring up the File Save dialog. enter the file name.

Record

Click the "Record" button to start recording.