Save captured camera frames into a video file. More...

Inheritance diagram for SaveVideo:

[legend]

Collaboration diagram for SaveVideo:

[legend]

Public Member Functions
	SaveVideo (std::string const &instance)
	Constructor. More...

void	postInit () override
	Get started. More...

void	postUninit () override
	Get stopped. More...

virtual	~SaveVideo ()
	Virtual destructor for safe inheritance. More...

void	process (jevois::InputFrame &&inframe, jevois::OutputFrame &&outframe) override
	Processing function, version that also shows a debug video output. More...

void	process (jevois::InputFrame &&inframe) override
	Processing function, version with no video output. More...

void	parseSerial (std::string const &str, std::shared_ptr< jevois::UserInterface >) override
	Receive a string from a serial port which contains a user command. More...

void	supportedCommands (std::ostream &os) override
	Human-readable description of this Module's supported custom commands. More...

Public Member Functions inherited from jevois::Module
	Module (std::string const &instance)

virtual	~Module ()

virtual void	process (InputFrame &&inframe, GUIhelper &helper)

virtual void	sendSerial (std::string const &str)

Public Member Functions inherited from jevois::Component
	Component (std::string const &instance)

virtual	~Component ()

std::shared_ptr< Comp >	addSubComponent (std::string const &instance, Args &&...args)

void	removeSubComponent (std::shared_ptr< Comp > &component)

void	removeSubComponent (std::string const &instance, bool warnIfNotFound=true)

std::shared_ptr< Comp >	getSubComponent (std::string const &instance) const

bool	isTopLevel () const

Engine *	engine () const

bool	initialized () const

const std::string &	className () const

const std::string &	instanceName () const

std::vector< std::string >	setParamVal (std::string const &paramdescriptor, T const &val)

void	setParamValUnique (std::string const &paramdescriptor, T const &val)

std::vector< std::pair< std::string, T > >	getParamVal (std::string const &paramdescriptor) const

T	getParamValUnique (std::string const &paramdescriptor) const

std::vector< std::string >	setParamString (std::string const &paramdescriptor, std::string const &val)

void	setParamStringUnique (std::string const &paramdescriptor, std::string const &val)

std::vector< std::pair< std::string, std::string > >	getParamString (std::string const &paramdescriptor) const

std::string	getParamStringUnique (std::string const &paramdescriptor) const

void	freezeParam (std::string const &paramdescriptor)

void	unFreezeParam (std::string const &paramdescriptor)

void	freezeAllParams ()

void	unFreezeAllParams ()

std::string	descriptor () const

void	setParamsFromFile (std::string const &filename)

std::istream &	setParamsFromStream (std::istream &is, std::string const &absfile)

virtual void	paramInfo (std::shared_ptr< UserInterface > s, std::map< std::string, std::string > &categs, bool skipFrozen, std::string const &cname="", std::string const &pfx="")

void	foreachParam (std::function< void(std::string const &compname, ParameterBase *p)> func, std::string const &cname="")

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ParameterCategory const &category)

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ValidValuesSpec< T > const &validValuesSpec, ParameterCategory const &category)

void	setDynamicParameterCallback (std::string const &name, std::function< void(T const &)> cb, bool callnow=true)

void	removeDynamicParameter (std::string const &name)

void	setPath (std::string const &path)

std::filesystem::path	absolutePath (std::filesystem::path const &path="")

std::shared_ptr< Comp >	addSubComponent (std::string const &instance, Args &&...args)

void	removeSubComponent (std::shared_ptr< Comp > &component)

void	removeSubComponent (std::string const &instance, bool warnIfNotFound=true)

std::shared_ptr< Comp >	getSubComponent (std::string const &instance) const

bool	isTopLevel () const

Engine *	engine () const

bool	initialized () const

const std::string &	className () const

const std::string &	instanceName () const

std::vector< std::string >	setParamVal (std::string const &paramdescriptor, T const &val)

void	setParamValUnique (std::string const &paramdescriptor, T const &val)

std::vector< std::pair< std::string, T > >	getParamVal (std::string const &paramdescriptor) const

T	getParamValUnique (std::string const &paramdescriptor) const

std::vector< std::string >	setParamString (std::string const &paramdescriptor, std::string const &val)

void	setParamStringUnique (std::string const &paramdescriptor, std::string const &val)

std::vector< std::pair< std::string, std::string > >	getParamString (std::string const &paramdescriptor) const

std::string	getParamStringUnique (std::string const &paramdescriptor) const

void	freezeParam (std::string const &paramdescriptor)

void	unFreezeParam (std::string const &paramdescriptor)

void	freezeAllParams ()

void	unFreezeAllParams ()

std::string	descriptor () const

void	setParamsFromFile (std::string const &filename)

std::istream &	setParamsFromStream (std::istream &is, std::string const &absfile)

virtual void	paramInfo (std::shared_ptr< UserInterface > s, std::map< std::string, std::string > &categs, bool skipFrozen, std::string const &cname="", std::string const &pfx="")

void	foreachParam (std::function< void(std::string const &compname, ParameterBase *p)> func, std::string const &cname="")

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ParameterCategory const &category)

std::shared_ptr< DynamicParameter< T > >	addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ValidValuesSpec< T > const &validValuesSpec, ParameterCategory const &category)

void	setDynamicParameterCallback (std::string const &name, std::function< void(T const &)> cb, bool callnow=true)

void	removeDynamicParameter (std::string const &name)

void	setPath (std::string const &path)

std::filesystem::path	absolutePath (std::filesystem::path const &path="")

Public Member Functions inherited from jevois::ParameterRegistry
virtual	~ParameterRegistry ()

Protected Member Functions
void	run ()

Protected Member Functions inherited from jevois::Component
virtual void	preInit ()

virtual void	preUninit ()

virtual void	preInit ()

virtual void	preUninit ()

Protected Member Functions inherited from jevois::ParameterRegistry
void	addParameter (ParameterBase *const param)

void	removeParameter (ParameterBase *const param)

void	callbackInitCall ()

Protected Attributes
std::future< void >	itsRunFut

jevois::BoundedBuffer< cv::Mat, jevois::BlockingBehavior::Block, jevois::BlockingBehavior::Block >	itsBuf

std::atomic< bool >	itsSaving

int	itsFileNum

std::atomic< bool >	itsRunning

std::string	itsFilename

Related Functions
(Note that these are not member functions.)
	JEVOIS_DECLARE_PARAMETER (filename, std::string, "Name of the video file to write. If path is not absolute, " PATHPREFIX " will be prepended to it. Name should contain a printf-like directive for " "one int argument, which will start at 0 and be incremented on each streamoff command.", "video%06d.avi", ParamCateg)
	Parameter. More...

	JEVOIS_DECLARE_PARAMETER (fourcc, std::string, "FourCC of the codec to use. The OpenCV VideoWriter doc is unclear " "as to which codecs are supported. Presumably, the ffmpeg library is used inside OpenCV. " "Hence any video encoder supported by ffmpeg should work. Tested codecs include: MJPG, " "MP4V, AVC1. Make sure you also pick the right filename extension (e.g., .avi for MJPG, " ".mp4 for MP4V, etc)", "MJPG", boost::regex("^\\w{4}$"), ParamCateg)
	Parameter. More...

	JEVOIS_DECLARE_PARAMETER (fps, double, "Video frames/sec as stored in the file and to be used both for recording and " "playback. Beware that the video writer will drop frames if you are capturing faster than " "the frame rate specified here. For example, if capturing at 120fps, be sure to set this " "parameter to 120, otherwise by default the saved video will be at 30fps even though capture " "was running at 120fps.", 30.0, ParamCateg)
	Parameter. More...

Detailed Description

Save captured camera frames into a video file.

This module records video and saves it to the MicroSD card inside the JeVois smart camera. It is useful, for example, to record footage that will be used to train some machine vision algorithm.

Issue the command start over the command-line interface to start saving video frames, and stop to stop saving. Successive start/stop commands will increment the file number (d argument in the filename parameter. Before a file is written, the module checks whether it already exists, and, if so, skips over it by incrementing the file number. See Command-line interface user guide for details on how to use the command-line interface.

This module works with any video resolution and pixel format supported by the camera sensor. Thus, additional video mappings are possible beyond the ones listed here.

See Advanced topic: Image pixel formats for information about pixel formats; with this module you can use the formats supported by the camera sensor.

This module accepts any resolution supported by the JeVois camera sensor.

This module can operate both with USB/GUI video output, or no USB video output.

When using with no USB/GUI output (NONE output format), you should first issue a streamon command to start video streaming by the camera sensor chip, then issue a start when you are ready to start recording. The streamon is not necessary when using a video mapping with USB video output, as the host computer over USB triggers video streaming when it starts grabbing frames from the JeVois camera.

This module internally uses the OpenCV VideoWriter class to compress and write the video file. See the OpenCV documentation for which video formats are supported.

You should be aware of two things when attempting video recording at high frame rates:

If using a video mapping with USB output, the frame rate may be limited by the maximum rate at which the host computer can grab and display. On many host computers, for example, the display refresh rate might be 60Hz. Using a video capture software on these computers is likely going to limit the maximum display rate to 60 frames/s and that will in turn limit the capture and saving rate. This is not an issue when using a video mapping with no USB output.
The fps parameter should be set to the rate at which you want to save video. If you capture at 60 frames/s according to your video mapping but fps is set to 30, saving will be at 30 fps. This limitation of rate is done internally by the OpenCV VideoWriter. So just make sure that you set the fps parameter to the rate at which you want to save.

Note that this module may suffer from DMA coherency artifacts if the camturbo parameter of the jevois::Engine is turned on, which it is by default. The camturbo parameter relaxes some of the cache coherency constraints on the video buffers captured by the camera sensor, which allows the JeVois processor to access video pixel data from memory faster. But with modules that do not do much processing, sometimes this yields video artifacts, we presume because some of the video data from previous frames still is in the CPU cache and hence is not again fetched from main memory by the CPU. If you see short stripes of what appears to be wrong pixel colors in the video, try to disable camturbo: edit JEVOIS:/config/params.cfg on your MicroSD card and in there turn camturbo to false.

Example use

Connect to the JeVois command-line interface (see Command-line interface user guide), and issue

setmapping2 YUYV 640 480 30.0 JeVois SaveVideo
streamon
start

and you will be saving compressed video with 640x480 at 30fps to your microSD card inside JeVois. When you are done, just issue:

stop

and the video file will be finalized and closed. If you want to access it directly by exporting the microSD inside JeVois as a virtual USB flash drive, issue (with JeVois v1.3 and later):

streamoff

to stop camera sensor streaming, and

usbsd

to export the microSD as a virtual USB flash drive. The video file(s) will be in the JEVOIS:/data/savevideo/ folder. You can then use the recorded video to test and debug a new algorithm using your host computer, by running jevois-daemon on the host computer with a video file input as opposed to a live camera input, as follows:

jevois-daemon --cameradev=myvideo.avi --videomapping=num

where you replace num above by the video mapping you want to use. See The jevois-daemon executable for more info about the cameradev parameter.

Author: Laurent Itti

Videomapping:: YUYV 320 240 60.0 YUYV 320 240 60.0 JeVois SaveVideo

Videomapping:: YUYV 320 240 30.0 YUYV 320 240 30.0 JeVois SaveVideo

Videomapping:: NONE 0 0 0 YUYV 320 240 60.0 JeVois SaveVideo

Videomapping:: NONE 0 0 0 YUYV 320 240 30.0 JeVois SaveVideo

Videomapping:: NONE 0 0 0 YUYV 176 144 120.0 JeVois SaveVideo

Custom module command:: start - start saving video

Custom module command:: stop - stop saving video and increment video file number

Email:: itti@usc.edu

Address:: University of Southern California, HNB-07A, 3641 Watt Way, Los Angeles, CA 90089-2520, USA

Copyright: Copyright (C) 2016 by Laurent Itti, iLab and the University of Southern California

Main URL:: http://jevois.org

Support URL:: http://jevois.org/doc

Other URL:: http://iLab.usc.edu

License:: GPL v3

Distribution:: Unrestricted

Restrictions:: None

Definition at line 179 of file SaveVideo.C.

Constructor & Destructor Documentation

◆ SaveVideo()

SaveVideo::SaveVideo ( std::string const & instance )

inline

Constructor.

Definition at line 186 of file SaveVideo.C.

◆ ~SaveVideo()

virtual SaveVideo::~SaveVideo ( )

inlinevirtual

Virtual destructor for safe inheritance.

Definition at line 223 of file SaveVideo.C.

Member Function Documentation

◆ parseSerial()

void SaveVideo::parseSerial	(	std::string const &	str,
		std::shared_ptr< jevois::UserInterface >
	)

inlineoverridevirtual

Receive a string from a serial port which contains a user command.

Reimplemented from jevois::Module.

Definition at line 344 of file SaveVideo.C.

References jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::filled_size(), itsBuf, itsSaving, LERROR, LINFO, jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::push(), jevois::Module::sendSerial(), demo::str, and system().

◆ postInit()

void SaveVideo::postInit ( )

inlineoverridevirtual

Get started.

Reimplemented from jevois::Component.

Definition at line 193 of file SaveVideo.C.

References jevois::async(), itsRunFut, itsRunning, and run().

◆ postUninit()

void SaveVideo::postUninit ( )

inlineoverridevirtual

Get stopped.

Reimplemented from jevois::Component.

Definition at line 204 of file SaveVideo.C.

References jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::filled_size(), itsBuf, itsFilename, itsRunFut, itsRunning, LERROR, LINFO, jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::push(), system(), and jevois::warnAndIgnoreException().

◆ process() [1/2]

void SaveVideo::process ( jevois::InputFrame && inframe )

inlineoverridevirtual

Processing function, version with no video output.

Reimplemented from jevois::Module.

Definition at line 263 of file SaveVideo.C.

References jevois::rawimage::convertToCvBGR(), jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::filled_size(), itsBuf, itsSaving, LERROR, and jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::push().

◆ process() [2/2]

void SaveVideo::process	(	jevois::InputFrame &&	inframe,
		jevois::OutputFrame &&	outframe
	)

inlineoverridevirtual

Processing function, version that also shows a debug video output.

Reimplemented from jevois::Module.

Definition at line 229 of file SaveVideo.C.

References jevois::rawimage::convertToCvBGR(), jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::filled_size(), h, jevois::RawImage::height, itsBuf, itsFilename, itsSaving, LERROR, jevois::rawimage::paste(), jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::push(), jevois::RawImage::require(), demo::w, jevois::RawImage::width, and jevois::rawimage::writeText().

◆ run()

void SaveVideo::run ( )

inlineprotected

Definition at line 384 of file SaveVideo.C.

References demo::frame, itsBuf, itsFilename, itsFileNum, itsRunning, LERROR, LFATAL, LINFO, PATHPREFIX, jevois::BoundedBuffer< class, WhenFull, WhenEmpty >::pop(), jevois::Module::sendSerial(), jevois::sformat(), system(), and to_string().

Referenced by postInit().

◆ supportedCommands()

void SaveVideo::supportedCommands ( std::ostream & os )

inlineoverridevirtual

Human-readable description of this Module's supported custom commands.

Reimplemented from jevois::Module.

Definition at line 377 of file SaveVideo.C.

Friends And Related Function Documentation

◆ JEVOIS_DECLARE_PARAMETER() [1/3]

JEVOIS_DECLARE_PARAMETER	(	filename	,
		std::string	,
		"Name of the video file to write. If path is not	absolute,
		" PATHPREFIX " will be prepended to it. Name should contain a printf-like directive for " "one int	argument,
		which will start at 0 and be incremented on each streamoff command."	,
		"video%06d.avi"	,
		ParamCateg
	)

◆ JEVOIS_DECLARE_PARAMETER() [2/3]

JEVOIS_DECLARE_PARAMETER	(	fourcc	,
		std::string	,
		"FourCC of the codec to use. The OpenCV VideoWriter doc is unclear " "as to which codecs are supported.	Presumably,
		the ffmpeg library is used inside OpenCV. " "Hence any video encoder supported by ffmpeg should work. Tested codecs include:MJPG	,
		" "	MP4V,
		AVC1. Make sure you also pick the right filename extension(e.g.,.avi for MJPG, " ".mp4 for MP4V, etc)"	,
		"MJPG"	,
		boost::regex("^\\w{4}$")	,
		ParamCateg
	)

◆ JEVOIS_DECLARE_PARAMETER() [3/3]

JEVOIS_DECLARE_PARAMETER	(	fps	,
		double	,
		"Video frames/sec as stored in the file and to be used both for recording and " "playback. Beware that the video writer will drop frames if you are capturing faster than " "the frame rate specified here. For	example,
		if capturing at	120fps,
		be sure to set this " "parameter to	120,
		otherwise by default the saved video will be at 30fps even though capture " "was running at 120fps."	,
		30.	0,
		ParamCateg
	)

Member Data Documentation

◆ itsBuf

jevois::BoundedBuffer<cv::Mat, jevois::BlockingBehavior::Block, jevois::BlockingBehavior::Block> SaveVideo::itsBuf

protected

Definition at line 448 of file SaveVideo.C.

Referenced by parseSerial(), postUninit(), process(), and run().

◆ itsFilename

std::string SaveVideo::itsFilename

protected

Definition at line 452 of file SaveVideo.C.

Referenced by postUninit(), process(), and run().

◆ itsFileNum

int SaveVideo::itsFileNum

protected

Definition at line 450 of file SaveVideo.C.

Referenced by run().

◆ itsRunFut

std::future<void> SaveVideo::itsRunFut

protected

Definition at line 447 of file SaveVideo.C.

Referenced by postInit(), and postUninit().

◆ itsRunning

std::atomic<bool> SaveVideo::itsRunning

protected

Definition at line 451 of file SaveVideo.C.

Referenced by postInit(), postUninit(), and run().

◆ itsSaving

std::atomic<bool> SaveVideo::itsSaving

protected

Definition at line 449 of file SaveVideo.C.

Referenced by parseSerial(), and process().

The documentation for this class was generated from the following file:

src/Modules/SaveVideo/SaveVideo.C

Public Member Functions

Protected Member Functions

Protected Attributes

Related Functions

Detailed Description

Example use

Constructor & Destructor Documentation

◆ SaveVideo()

◆ ~SaveVideo()

Member Function Documentation

◆ parseSerial()

◆ postInit()

◆ postUninit()

◆ process() [1/2]

◆ process() [2/2]

◆ run()

◆ supportedCommands()

Friends And Related Function Documentation

◆ JEVOIS_DECLARE_PARAMETER() [1/3]

◆ JEVOIS_DECLARE_PARAMETER() [2/3]

◆ JEVOIS_DECLARE_PARAMETER() [3/3]

Member Data Documentation

◆ itsBuf

◆ itsFilename

◆ itsFileNum

◆ itsRunFut

◆ itsRunning

◆ itsSaving