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gpac.1
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.TH gpac 1 2019 gpac GPAC
.
.SH NAME
.LP
gpac \- GPAC command-line filter session manager
.SH SYNOPSIS
.LP
.B gpac
.RI [options] FILTER [LINK] FILTER [...]
.br
.
gpac is GPAC's command line tool for setting up and running filter chains.
.br
.br
FILTER: a single filter declaration (e.g., -i file, -o dump, inspect, ...), see gpac -h doc.
.br
[LINK]: a link instruction (e.g., @, @2, @2#StreamType=Visual, ...), see gpac -h doc.
.br
[options]: one or more option strings, each starting with a - character.
.br
- an option using a single - indicates an option of gpac (see gpac -hx) or of libgpac (see gpac -hx core)
.br
- an option using -- indicates a global filter or meta-filter (e.g. FFMPEG) option, e.g. --block_size=1000 or --profile=Baseline (see gpac -h doc)
.br
.br
Filter declaration order may impact the link resolver which will try linking in declaration order. Most of the time for simple graphs, this has no impact. However, for complex graphs with no link declarations, this can lead to different results.
.br
Options do not require any specific order, and may be present anywhere, including between link statements or filter declarations.
.br
Boolean values do not need any value specified. Other types shall be formatted as opt=val, except .I -i, -src, .I -o, -dst and .I -h options.
.br
.br
The session can be interrupted at any time using ctrl+c, which can also be used to toggle global reporting.
.br
.br
The possible options for gpac are:
.br
.br
.TP
.B \-mem-track
.br
enable memory tracker
.br
.TP
.B \-mem-track-stack
.br
enable memory tracker with stack dumping
.br
.TP
.B \-ltf
.br
load test-unit filters (used for for unit tests only)
.br
.TP
.B \-sloop (int)
.br
loop execution of session, creating a session at each loop, mainly used for testing. If no value is given, loops forever
.br
.TP
.B \-runfor (int)
.br
run for the given amount of milliseconds
.br
.TP
.B \-runforx (int)
.br
run for the given amount of milliseconds and exit with no cleanup
.br
.TP
.B \-runfors (int)
.br
run for the given amount of milliseconds and exit with segfault (tests)
.br
.TP
.B \-runforl (int)
.br
run for the given amount of milliseconds and wait forever at end (tests)
.br
.TP
.B \-stats
.br
print stats after execution
.br
.TP
.B \-graph
.br
print graph after execution
.br
.TP
.B \-k
.br
enable keyboard interaction from command line
.br
.TP
.B \-r (string)
.br
enable reporting
.br
* r: runtime reporting
.br
* r=FA[,FB]: runtime reporting but only print given filters, e.g. r=mp4mx for ISOBMFF multiplexer only
.br
* r=: only print final report
.br
.TP
.B \-seps (string, default: :=#,!@)
.br
set the default character sets used to separate various arguments
.br
- the first char is used to separate argument names
.br
- the second char, if present, is used to separate names and values
.br
- the third char, if present, is used to separate fragments for PID sources
.br
- the fourth char, if present, is used for list separators (sourceIDs, gfreg, ...)
.br
- the fifth char, if present, is used for boolean negation
.br
- the sixth char, if present, is used for LINK directives (see filters help (-h doc))
.br
.TP
.B \-i,-src (string)
.br
specify an input file - see filters help (-h doc)
.br
.TP
.B \-o,-dst (string)
.br
specify an output file - see filters help (-h doc)
.br
.TP
.B \-ib (string)
.br
specify an input file to wrap as GF_FileIO object (testing of GF_FileIO)
.br
.TP
.B \-ob (string)
.br
specify an output file to wrap as GF_FileIO object (testing of GF_FileIO)
.br
.TP
.B \-cl
.br
force complete mode when no link directive are set - see filters help (-h doc)
.br
.TP
.B \-step
.br
test step mode in non-blocking session
.br
.TP
.B \-h,-help,-ha,-hx,-hh (string)
.br
print help. Use -help or -h for basic options, -ha for advanced options, -hx for expert options and -hh for all.
.br
Note: The @ character can be used in place of the * character. String parameter can be:
.br
* empty: print command line options help
.br
* doc: print the general filter info
.br
* alias: print the gpac alias syntax
.br
* log: print the log system help
.br
* core: print the supported libgpac core options. Use -ha/-hx/-hh for advanced/expert options
.br
* cfg: print the GPAC configuration help
.br
* prompt: print the GPAC prompt help when running in interactive mode (see .I -k )
.br
* modules: print available modules
.br
* filters: print name of all available filters
.br
* filters:*: print name of all available filters, including meta filters
.br
* codecs: print the supported builtin codecs - use -hx to include unmapped codecs (ffmpeg, ...)
.br
* props: print the supported builtin PID and packet properties
.br
* props PNAME: print the supported builtin PID and packet properties mentioning PNAME
.br
* colors: print the builtin color names and their values
.br
* exts: print the builtin extensions and mime types - use -hx to include meta filters (ffmpeg, ...)
.br
* layouts: print the builtin CICP audio channel layout names and their values
.br
* links: print possible connections between each supported filters (use -hx to view src->dst cap bundle detail)
.br
* links FNAME: print sources and sinks for filter FNAME (either builtin or JS filter)
.br
* FNAME: print filter FNAME info (multiple FNAME can be given)
.br
- For meta-filters, use FNAME:INST, e.g. ffavin:avfoundation
.br
- Use * to print info on all filters (big output!), *:* to print info on all filters including meta filter instances (really big output!)
.br
- By default only basic filter options and description are shown. Use -ha to show advanced options capabilities, -hx for expert options, -hh for all options and filter capabilities including on filters disabled in this build
.br
* FNAME.OPT: print option OPT in filter FNAME
.br
* OPT: look in filter names and options for OPT and suggest possible matches if none found. Use -hx to look for keyword in all option descriptions
.br
.br
.TP
.B \-p (string)
.br
use indicated profile for the global GPAC config. If not found, config file is created. If a file path is indicated, this will load profile from that file. Otherwise, this will create a directory of the specified name and store new config there. Reserved name 0 means a new profile, not stored to disk. Appending :reload to the profile name will force recreating a new configuration file
.br
.TP
.B \-alias (string)
.br
assign a new alias or remove an alias. Can be specified several times. See alias usage (-h alias)
.br
.TP
.B \-aliasdoc (string)
.br
assign documentation for a given alias (optional). Can be specified several times
.br
.TP
.B \-uncache
.br
revert all items in GPAC cache directory to their original name and server path
.br
.TP
.B \-js (string)
.br
specify javascript file to use as controller of filter session
.br
.TP
.B \-wc
.br
write all core options in the config file unless already set
.br
.TP
.B \-we
.br
write all file extensions in the config file unless already set (useful to change some default file extensions)
.br
.TP
.B \-wf
.br
write all filter options in the config file unless already set
.br
.TP
.B \-wfx
.br
write all filter options and all meta filter arguments in the config file unless already set (large config file !)
.br
.TP
.B \-xopt
.br
unrecognized options and filters declaration following this option are ignored - used to pass arguments to GUI
.br
.br
.br
The following libgpac core options allow customizing the filter session:
.br
.br
.TP
.B \-dbg-edges
.br
log edges status in filter graph before dijkstra resolution (for debug). Edges are logged as edge_source(status, weight, src_cap_idx, dst_cap_idx)
.br
.TP
.B \-full-link
.br
throw error if any PID in the filter graph cannot be linked
.br
.TP
.B \-no-block (Enum, default: no)
.br
disable blocking mode of filters
.br
* no: enable blocking mode
.br
* fanout: disable blocking on fan-out, unblocking the PID as soon as one of its destinations requires a packet
.br
* all: disable blocking
.br
.TP
.B \-no-reg
.br
disable regulation (no sleep) in session
.br
.TP
.B \-no-reassign
.br
disable source filter reassignment in PID graph resolution
.br
.TP
.B \-sched (Enum, default: free)
.br
set scheduler mode
.br
* free: lock-free queues except for task list (default)
.br
* lock: mutexes for queues when several threads
.br
* freex: lock-free queues including for task lists (experimental)
.br
* flock: mutexes for queues even when no thread (debug mode)
.br
* direct: no threads and direct dispatch of tasks whenever possible (debug mode)
.br
.TP
.B \-max-chain (int, default: 6)
.br
set maximum chain length when resolving filter links. Default value covers for [ in -> ] dmx -> reframe -> decode -> encode -> reframe -> mx [ -> out]. Filter chains loaded for adaptation (e.g. pixel format change) are loaded after the link resolution. Setting the value to 0 disables dynamic link resolution. You will have to specify the entire chain manually
.br
.TP
.B \-max-sleep (int, default: 50)
.br
set maximum sleep time slot in milliseconds when regulation is enabled
.br
.TP
.B \-threads (int)
.br
set N extra thread for the session. -1 means use all available cores
.br
.TP
.B \-no-probe
.br
disable data probing on sources and relies on extension (faster load but more error-prone)
.br
.TP
.B \-no-argchk
.br
disable tracking of argument usage (all arguments will be considered as used)
.br
.TP
.B \-blacklist (string)
.br
blacklist the filters listed in the given string (comma-separated list). If first character is '-', this is a whitelist, i.e. only filters listed in the given string will be allowed
.br
.TP
.B \-no-graph-cache
.br
disable internal caching of filter graph connections. If disabled, the graph will be recomputed at each link resolution (lower memory usage but slower)
.br
.TP
.B \-no-reservoir
.br
disable memory recycling for packets and properties. This uses much less memory but stresses the system memory allocator much more
.br
.SH Using Aliases
.PL
The gpac command line can become quite complex when many sources or filters are used. In order to simplify this, an alias system is provided.
.br
.br
To assign an alias, use the syntax gpac -alias="NAME VALUE".
.br
* `NAME`: shall be a single string, with no space.
.br
* `VALUE`: the list of argument this alias replaces. If not set, the alias is destroyed
.br
.br
When parsing arguments, the alias will be replace by its value.
.br
Example
.br
gpac -alias="output aout vout"
.br
.br
This allows later audio and video playback using gpac -i src.mp4 output
.br
.br
Aliases can use arguments from the command line. The allowed syntaxes are:
.br
* `@{a}`: replaced by the value of the argument with index a after the alias
.br
* `@{a,b}`: replaced by the value of the arguments with index a and b
.br
* `@{a:b}`: replaced by the value of the arguments between index a and b
.br
* `@{-a,b}`: replaced by the value of the arguments with index a and b, inserting a list separator (comma by default) between them
.br
* `@{-a:b}`: replaced by the value of the arguments between index a and b, inserting a list separator (comma by default) between them
.br
* `@{+a,b}`: clones the parent word in the alias for a and b, replacing this pattern in each clone by the corresponding argument
.br
* `@{+a:b}`: clones the parent word in the alias for each argument between index a and b, replacing this pattern in each clone by the corresponding argument
.br
.br
The specified index can be:
.br
* forward index: a strictly positive integer, 1 being the first argument after the alias
.br
* backward index: the value 'n' (or 'N') to indicate the last argument on the command line. This can be followed by -x to rewind arguments (e.g. @{n-1} is the before last argument)
.br
.br
Before solving aliases, all option arguments are moved at the beginning of the command line. This implies that alias arguments cannot be options.
.br
Arguments not used by any aliases are kept on the command line, other ones are removed
.br
.br
Example
.br
-alias="foo src=@{N} dst=test.mp4"
.br
.br
The command gpac foo f1 f2 expands to gpac src=f2 dst=test.mp4 f1
.br
Example
.br
-alias="list: inspect src=@{+:N}"
.br
.br
The command gpac list f1 f2 f3 expands to gpac inspect src=f1 src=f2 src=f3
.br
Example
.br
-alias="list inspect src=@{+2:N}"
.br
.br
The command gpac list f1 f2 f3 expands to gpac inspect src=f2 src=f3 f1
.br
Example
.br
-alias="plist aout vout flist:srcs=@{-,N}"
.br
.br
The command gpac plist f1 f2 f3 expands to gpac aout vout flist:srcs="f1,f2,f3"
.br
.br
Alias documentation can be set using gpac -aliasdoc="NAME VALUE", with NAME the alias name and VALUE the documentation.
.br
Alias documentation will then appear in gpac help.
.br
.br
.SH Configuration file
.LP
.br
GPAC uses a configuration file to modify default options of libgpac and filters. This file is called GPAC.cfg and is located:
.br
- on Windows platforms, in C:\Users\FOO\AppData\Roaming\GPAC or in C:\Program Files\GPAC.
.br
- on iOS platforms, in a .gpac folder in the app storage directory.
.br
- on Android platforms, in /sdcard/GPAC/ if this directory exists, otherwise in /data/data/io.gpac.gpac/GPAC.
.br
- on other platforms, in a $HOME/.gpac/.
.br
.br
Applications in GPAC can also specify a different configuration file through the .I -p profile option. EX gpac -p=foo []
.br
This will load configuration from $HOME/.gpac/foo/GPAC.cfg, creating it if needed.
.br
The reserved name 0 is used to disable configuration file writing.
.br
.br
The configuration file is structured in sections, each made of one or more keys:
.br
- section foo is declared as [foo]\n
.br
- key bar with value N is declared as bar=N\n. The key value N is not interpreted and always handled as ASCII text.
.br
.br
By default the configuration file only holds a few system specific options and directories. It is possible to serialize the entire set of options to the configuration file, using .I -wc .I -wf.
.br
This should be avoided as the resulting configuration file size will be quite large, hence larger memory usage for the applications.
.br
The options specified in the configuration file may be overridden by the values in restrict.cfg file located in GPAC share system directory (e.g. /usr/share/gpac or C:\Program Files\GPAC), if present; this allows enforcing system-wide configuration values.
.br
Note: The methods describe in this section apply to any application in GPAC transferring their arguments to libgpac. This is the case for gpac and MP4Box.
.br
.br
.SH Core options
.LP
.br
The options from libgpac core can also be assigned though the config file from section core using option name without initial dash as key name.
.br
Example
.br
[core]
.br
threads=2
.br
.br
Setting this in the config file is equivalent to using -threads=2.
.br
The options specified at prompt overrides the value of the config file.
.br
.SH Filter options in configuration
.LP
.br
It is possible to alter the default value of a filter option by modifying the configuration file. Filter foo options are stored in section [filter@foo], using option name and value as key-value pair. Options specified through the configuration file do not take precedence over options specified at prompt or through alias.
.br
Example
.br
[filter@rtpin]
.br
interleave=yes
.br
.br
This will force the rtp input filter to always request RTP over RTSP by default.
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To generate a configuration file with all filters options serialized, use .I -wf.
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.SH Global filter options
.LP
.br
It is possible to specify options global to multiple filters using --OPTNAME=VAL. Global options do not override filter options but take precedence over options loaded from configuration file.
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This will set option OPTNAME, when present, to VAL in any loaded filter.
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Example
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--buffer=100 -i file vout aout
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.br
This is equivalent to specifying vout:buffer=100 aout:buffer=100.
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Example
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--buffer=100 -i file vout aout:buffer=10
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.br
This is equivalent to specifying vout:buffer=100 aout:buffer=10.
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Warning: This syntax only applies to regular filter options. It cannot be used with builtin shortcuts (gfreg, enc, ...).
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Meta-filter options can be set in the same way using the syntax --OPT_NAME=VAL.
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Example
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--profile=Baseline -i file.cmp -o dump.264
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.br
This is equivalent to specifying -o dump.264:profile=Baseline.
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For both syntaxes, it is possible to specify the filter registry name of the option, using --FNAME:OPTNAME=VAL or --FNAME@OPTNAME=VAL.
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In this case the option will only be set for filters which are instances of registry FNAME. This is used when several registries use same option names.
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Example
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--flist@timescale=100 -i plist1 -i plist2 -o live.mpd
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.br
This will set the timescale option on the playlists filters but not on the dasher filter.
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.SH libgpac core options:
.LP
.br
.TP
.B \-noprog
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disable progress messages
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.TP
.B \-quiet
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disable all messages, including errors
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.TP
.B \-proglf
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use new line at each progress messages
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.TP
.B \-strict-error,-se
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exit after the first error is reported
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.TP
.B \-store-dir (string)
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set storage directory
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.TP
.B \-mod-dirs (string list)
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set additional module directories as a semi-colon ; separated list
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.TP
.B \-js-dirs (string list)
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set javascript directories
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.TP
.B \-no-js-mods (string list)
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disable javascript module loading
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.TP
.B \-ifce (string)
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set default multicast interface through interface IP address (default is 127.0.0.1)
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.TP
.B \-lang (string)
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set preferred language
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.TP
.B \-cfg,-opt (string)
.br
get or set configuration file value. The string parameter can be formatted as:
.br
* `section:key=val`: set the key to a new value
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* `section:key=null`, `section:key`: remove the key
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* `section=null`: remove the section
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* no argument: print the entire configuration file
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* `section`: print the given section
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* `section:key`: print the given key in section (section can be set to *)- *:key: print the given key in all sections
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.TP
.B \-no-save
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discard any changes made to the config file upon exit
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.TP
.B \-mod-reload
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unload / reload module shared libs when no longer used
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.TP
.B \-for-test
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disable all creation/modification dates and GPAC versions in files
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.TP
.B \-old-arch
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enable compatibility with pre-filters versions of GPAC
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.TP
.B \-ntp-shift (int)
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shift NTP clock by given amount in seconds
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.TP
.B \-bs-cache-size (int, default: 512)
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cache size for bitstream read and write from file (0 disable cache, slower IOs)
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.TP
.B \-no-check
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disable compliance tests for inputs (ISOBMFF for now). This will likely result in random crashes
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.TP
.B \-unhandled-rejection
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dump unhandled promise rejections
.br
.TP
.B \-startup-file (string)
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startup file of compositor in GUI mode
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.TP
.B \-docs-dir (string)
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default documents directoty (for GUI on iOS and Android)
.br
.TP
.B \-last-dir (string)
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last working directory (for GUI)
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.TP
.B \-cache (string)
.br
cache directory location
.br
.TP
.B \-proxy-on
.br
enable HTTP proxy
.br
.TP
.B \-proxy-name (string)
.br
set HTTP proxy address
.br
.TP
.B \-proxy-port (int, default: 80)
.br
set HTTP proxy port
.br
.TP
.B \-maxrate (int)
.br
set max HTTP download rate in bits per sec. 0 means unlimited
.br
.TP
.B \-no-cache
.br
disable HTTP caching
.br
.TP
.B \-offline-cache
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enable offline HTTP caching (no re-validation of existing resource in cache)
.br
.TP
.B \-clean-cache
.br
indicate if HTTP cache should be clean upon launch/exit
.br
.TP
.B \-cache-size (int, default: 100M)
.br
specify cache size in bytes
.br
.TP
.B \-head-timeout (int, default: 5000)
.br
set HTTP head request timeout in milliseconds
.br
.TP
.B \-req-timeout (int, default: 20000)
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set HTTP/RTSP request timeout in milliseconds
.br
.TP
.B \-no-timeout
.br
ignore HTTP 1.1 timeout in keep-alive
.br
.TP
.B \-broken-cert
.br
enable accepting broken SSL certificates
.br
.TP
.B \-user-agent,-ua (string)
.br
set user agent name for HTTP/RTSP
.br
.TP
.B \-user-profileid (string)
.br
set user profile ID (through X-UserProfileID entity header) in HTTP requests
.br
.TP
.B \-user-profile (string)
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set user profile filename. Content of file is appended as body to HTTP HEAD/GET requests, associated Mime is text/xml
.br
.TP
.B \-query-string (string)
.br
insert query string (without ?) to URL on requests
.br
.TP
.B \-dm-threads
.br
force using threads for async download requests rather than session scheduler
.br
.TP
.B \-cte-rate-wnd (int, default: 20)
.br
set window analysis length in milliseconds for chunk-transfer encoding rate estimation
.br
.TP
.B \-no-h2
.br
disable HTTP2
.br
.TP
.B \-no-h2c
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disable HTTP2 upgrade (i.e. over non-TLS)
.br
.TP
.B \-h2-copy
.br
enable intermediate copy of data in nghttp2 (default is disabled but may report as broken frames in wireshark)
.br
.TP
.B \-dbg-edges
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log edges status in filter graph before dijkstra resolution (for debug). Edges are logged as edge_source(status, weight, src_cap_idx, dst_cap_idx)
.br
.TP
.B \-full-link
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throw error if any PID in the filter graph cannot be linked
.br
.TP
.B \-no-block (Enum, default: no)
.br
disable blocking mode of filters
.br
* no: enable blocking mode
.br
* fanout: disable blocking on fan-out, unblocking the PID as soon as one of its destinations requires a packet
.br
* all: disable blocking
.br
.TP
.B \-no-reg
.br
disable regulation (no sleep) in session
.br
.TP
.B \-no-reassign
.br
disable source filter reassignment in PID graph resolution
.br
.TP
.B \-sched (Enum, default: free)
.br
set scheduler mode
.br
* free: lock-free queues except for task list (default)
.br
* lock: mutexes for queues when several threads
.br
* freex: lock-free queues including for task lists (experimental)
.br
* flock: mutexes for queues even when no thread (debug mode)
.br
* direct: no threads and direct dispatch of tasks whenever possible (debug mode)
.br
.TP
.B \-max-chain (int, default: 6)
.br
set maximum chain length when resolving filter links. Default value covers for [ in -> ] dmx -> reframe -> decode -> encode -> reframe -> mx [ -> out]. Filter chains loaded for adaptation (e.g. pixel format change) are loaded after the link resolution. Setting the value to 0 disables dynamic link resolution. You will have to specify the entire chain manually
.br
.TP
.B \-max-sleep (int, default: 50)
.br
set maximum sleep time slot in milliseconds when regulation is enabled
.br
.TP
.B \-threads (int)
.br
set N extra thread for the session. -1 means use all available cores
.br
.TP
.B \-no-probe
.br
disable data probing on sources and relies on extension (faster load but more error-prone)
.br
.TP
.B \-no-argchk
.br
disable tracking of argument usage (all arguments will be considered as used)
.br
.TP
.B \-blacklist (string)
.br
blacklist the filters listed in the given string (comma-separated list). If first character is '-', this is a whitelist, i.e. only filters listed in the given string will be allowed
.br
.TP
.B \-no-graph-cache
.br
disable internal caching of filter graph connections. If disabled, the graph will be recomputed at each link resolution (lower memory usage but slower)
.br
.TP
.B \-no-reservoir
.br
disable memory recycling for packets and properties. This uses much less memory but stresses the system memory allocator much more
.br
.TP
.B \-switch-vres
.br
select smallest video resolution larger than scene size, otherwise use current video resolution
.br
.TP
.B \-hwvmem (Enum, default: auto)
.br
specify (2D rendering only) memory type of main video backbuffer. Depending on the scene type, this may drastically change the playback speed
.br
* always: always on hardware
.br
* never: always on system memory
.br
* auto: selected by GPAC based on content type (graphics or video)
.br
.TP
.B \-pref-yuv4cc (string)
.br
set preferred YUV 4CC for overlays (used by DirectX only)
.br
.TP
.B \-offscreen-yuv
.br
indicate if offscreen yuv->rgb is enabled. can be set to false to force disabling
.br
.TP
.B \-overlay-color-key (string)
.br
color to use for overlay keying, hex format
.br
.TP
.B \-gl-bits-comp (int, default: 8)
.br
number of bits per color component in OpenGL
.br
.TP
.B \-gl-bits-depth (int, default: 16)
.br
number of bits for depth buffer in OpenGL
.br
.TP
.B \-gl-doublebuf
.br
enable OpenGL double buffering
.br
.TP
.B \-sdl-defer
.br
use defer rendering for SDL
.br
.TP
.B \-no-colorkey
.br
disable color keying at the video output level
.br
.TP
.B \-glfbo-txid (int)
.br
set output texture ID when using glfbo output. The OpenGL context shall be initialized and gf_term_process shall be called with the OpenGL context active
.br
.TP
.B \-video-output (string)
.br
indicate the name of the video output module to use (see gpac -h modules). The reserved name glfbo is used in player mode to draw in the OpenGL texture identified by .I glfbo-txid. In this mode, the application is responsible for sending event to the compositor
.br
.TP
.B \-dfb-sys (string, default: x11)
.br
system DirectFB (x11, sdl, vnc, fbdev, osx ordevmem)
.br
.TP
.B \-dfb-flip (string, default: waitsync)
.br
vsync mode for DirectFB (waitsync, wait, sync or swap)
.br
.TP
.B \-audio-output (string)
.br
indicate the name of the audio output module to use
.br
.TP
.B \-alsa-devname (string)
.br
set ALSA dev name
.br
.TP
.B \-force-alsarate (int)
.br
force ALSA and OSS output sample rate
.br
.TP
.B \-ds-disable-notif
.br
disable DirectSound audio buffer notifications when supported
.br
.TP
.B \-font-reader (string)
.br
indicate name of font reader module