% M4ACUT(1) % nu774 [email protected] % May, 2014
m4acut - losslessly and gaplessly cut M4A(AAC in MP4) files
m4acut [OPTIONS] [FILE]
m4acut reads M4A files and extracts a portion of the audio into a new file. When chapter mode is specified, it can automatically extract each chapter into files, setting title tag and track tag from chapter title/number.
Since m4acut takes priming /padding samples into account and writes iTunSMPB tag properly, m4acut allows any cut point (not restricted to AAC frame boundaries) and the resulting files can be played gaplessly.
-h, --help
: Show command help
-v, --version
: Show version number
-o, --output <file>
: Specify output filename. Ignored when -c/-C is set. Otherwise required.
-s, --start <[[hh:]mm:]ss[.ss..]|ns>
: Specify cut start point in either time or number of samples.
When not given, 0 is assumed.
Example:
: 588s
: 588 samples
: 23.46
: 23.46 secs
: 15
: 15 secs
: 39:12
: 39m 12s
-e, --end <[[hh:]mm:]ss[.ss..]|ns>
: Specify cut end point (exclusive). When not given, end of input is assumed.
-c, --chapter-mode
: Enables chapter mode. Splits automatically at each chapter point.
-C, --cuesheet <file>
: Specify cuesheet and split automatically at each track in it.
--cuesheet-encoding <name>
: Specify character encoding name of cuesheet.
By default, UTF-8 is assumed.
-c, -C, and -s/-e are Mutually exclusive and cannot be set at the same time.Either use the docker image (recommended) or use this commands (Tested on ubuntu):
# prerequisits
apt update && apt install -y wget unzip
# downloading releases of m4acut && the required shared libraries
wget https://github.com/JKamsker/l-smash/releases/download/v2.14.7-beta-02/Artifacts.zip \
&& unzip Artifacts.zip \
&& rm Artifacts.zip
wget https://github.com/JKamsker/m4acut/releases/download/v0.1.3-alpha-02/Artifacts.zip \
&& unzip Artifacts.zip \
&& rm Artifacts.zip
# Setting environment variables & chmod
chmod +x m4acut \
&& LD_LIBRARY_PATH=$PWD/lib \
&& export LD_LIBRARY_PATH \
# running the binary
./m4acut