% FDKAAC(1)% nu774% November, 2013 NAME ==== fdkaac - command line frontend for libfdk-aac encoder SYNOPSIS ======== **fdkaac** [OPTIONS] [FILE] DESCRIPTION =========== **fdkaac** reads linear PCM audio in either WAV, raw PCM, or CAF format, and encodes it into either M4A / AAC file. If the input file is '-', data is read from stdin. Likewise, if the output file is '-', data is written to stdout if one of streamable AAC transport formats are selected by **-f**. When CAF input and M4A output is used, tags in CAF file are copied into the resulting M4A. OPTIONS ======= -h, --help: Show command help -o: Output filename. -p, --profile: Target profile (MPEG4 audio object type, AOT) 2: MPEG-4 AAC LC (default) 5: MPEG-4 HE-AAC (SBR) 29: MPEG-4 HE-AAC v2 (SBR+PS) 23: MPEG-4 AAC LD 39: MPEG-4 AAC ELD -b, --bitrate: Target bitrate (for CBR) -m, --bitrate-mode: Bitrate configuration mode. Lotus Smartsuite 9.8 Keygen.

Available VBR quality value depends on other parameters such as profile, sample rate, or number of channels. 0: CBR (default) 1-5: VBR (higher value - >higher bitrate) -w, --bandwidth: Frequency bandwidth (lowpass cut-off frequency) in Hz. El Club Bilderberg Pdf Cristina Martin. Available on AAC LC only. -a, --afterburner: Configure afterburner mode. When enabled, quality is increased at the expense of additional computational workload. 0: Off 1: On (default) -L, --lowdelay-sbr: Configure SBR activity on AAC ELD. -1: Use ELD SBR auto configuration 0: Disable SBR on ELD (default) 1: Enable SBR on ELD -s, --sbr-ratio: Controls activation of downsampled SBR.

0: Use lib default (default) 1: Use downsampled SBR (default for ELD+SBR) 2: Use dual-rate SBR (default for HE-AAC) Dual-rate SBR is what is normally used for HE-AAC, where AAC is encoded at half the sample rate of SBR, hence 'dual rate'. On the other hand, downsampled SBR uses same sample rate for both of AAC and SBR (single rate), therefore downsampled SBR typically consumes more bitrate. Downsampled SBR is newly introduced feature in FDK encoder library version 3.4.12. When libfdk-aac in the system doesn't support this, dual-rate SBR will be used. When available, dual-rate SBR is the default for HE-AAC and downsampled SBR is the default for ELD+SBR. Note that downsampled HE-AAC is not so common as dual-rate one. When downsampled HE-AAC is selected, **fdkaac** is forced to choose explicit hierarchical SBR signaling, which (at least) iTunes doesn't accept.