Supported Audio Formats

WAVE/BWF/RF64

If the audio data in the WAVE file has linear (PCM) or MPEG Layer 2 format, the file can be played. MPEG Layer 3 content can be decoded, if a suitable MP3 codec is installed. All other audio formats can be decoded, of a corresponding ACM (Audio Compression Manager) codec is installed. The same is true for BWF (Broadcast Wave Format) and RF64 files, which are extensions to the WAVE format.

AIFF/AIFC

MultiRec_4 can read AIFF files with linear (PCM) audio data. It can also read AIFC files with the special compression type “sowt”. “sowt” is not a real compression, but indicates that the PCM data is in “big endian” format (normal AIFF files contain “little endian” data).

MusiFile

MultiRec_4 can read MPEG Layer 2 files in MusiFile format.

MPEG4

For reading MPEG4 audio files, a suitable DirectX codec must be installed.

Raw

MultiRec_4 can read MPEG Layer 2 and Layer 3 raw files. Furthermore, it can decode any audio file, which is recognized by the system’s DirectX codecs.

Ogg

MultiRec_4 can read Ogg files with Vorbis or Opus audio content.

FLAC

MultiRec_4 can read FLAC audio files, if the FLAC runtime DLLs are installed on the system.

Linear (PCM)

MultiRec_4 can read PCM audio with these formats:

• Sampling rate: any

• Number of audio channels: 1-32 (only the first two channels will be used for playback; in multi-channel WAVE/BWF/RF64 files, which contain a stereo downmix, that downmix is used for playback)

• Sample resolution: 8-32 bit integer; 32 and 64 bit floating point

MPEG Layer 2

The built-in MPEG Layer 2 codec can read audio with sampling rates of 32 kHz, 44.1 kHz and 48 kHz, in any valid MPEG bit rate. Additionally, MPEG II LSF (Lower Sampling Frequency) formats with sampling rates of 16 kHz, 22.05 kHz and 24 kHz are supported.

MPEG Layer 3

For decoding MP3 audio, MultiRec_4 tries to find a suitable DirectX codec installed on the system. Because all Windows OS come with such a codec, MP3 decoding usually works without installing additional codecs. The Windows codec can read any valid MP3 stream, including variable bit rate ones.

WMA, AAC

For reading files with audio in WMA (Windows Media Audio) or AAC (Advanced Audio Coding) format, MultiRec_4 uses the DirectX mechanism. This means, that the files can be read, if suitable codecs are installed on the system.

Opus

MultiRec_4 can read Opus-encoded audio in an Ogg container.

WAVE/BWF/RF64

Audio formats are linear (PCM), MPEG Layer 2 or MPEG Layer 3, RF64 is automatically created, if the file size exceeds 4 GB.

MusiFile

Only MPEG Layer 2.

Raw

MPEG Layer 2 or MPEG Layer 3.

AIFF

Only linear audio.

Linear (PCM)

PCM audio can be created with these formats:

• Sampling rate: 32 kHz, 44.1 kHz, 48 kHz, 96 kHz

• Number of audio channels: mono, stereo

• Sample resolution: 8 bit, 16 bit, 24 bit

MPEG Layer 2

MPEG Layer 2 audio can be created with sampling rates of 32 kHz, 44.1 kHz and 48 kHz, in any valid MPEG Layer 2 bit rate.

MPEG Layer 3

If a LAME codec is installed, MPEG Layer 3 audio can be created in a wide variety of sampling rate / bit rate combinations.