WO2004017636A1 - Procede de diffusion en temps reel de fichiers multimedias au cours d'une visioconference, sans rupture de communication, et interface homme-machine pour la mise en oeuvre - Google Patents
Procede de diffusion en temps reel de fichiers multimedias au cours d'une visioconference, sans rupture de communication, et interface homme-machine pour la mise en oeuvre Download PDFInfo
- Publication number
- WO2004017636A1 WO2004017636A1 PCT/FR2003/002365 FR0302365W WO2004017636A1 WO 2004017636 A1 WO2004017636 A1 WO 2004017636A1 FR 0302365 W FR0302365 W FR 0302365W WO 2004017636 A1 WO2004017636 A1 WO 2004017636A1
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- WIPO (PCT)
- Prior art keywords
- videoconference
- communication
- video
- audio
- terminal
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004590 computer program Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
- H04L65/401—Support for services or applications wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference
- H04L65/4015—Support for services or applications wherein the services involve a main real-time session and one or more additional parallel real-time or time sensitive sessions, e.g. white board sharing or spawning of a subconference where at least one of the additional parallel sessions is real time or time sensitive, e.g. white board sharing, collaboration or spawning of a subconference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
- H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
Definitions
- the invention relates to a method of broadcasting multimedia files in real time during a videoconference, without communication breakdown, and Human-Machine interface for implementing said method.
- a videoconference terminal is conventionally used consisting of dedicated or non-dedicated computer equipment. It can therefore be a PC type computer equipped with videoconferencing functions.
- the computer is then coupled to sources for capturing audio and video signals (camera, microphones).
- the computer is also equipped with software for processing the captured signals and for processing the received signals, means for connecting to a telecommunications network as well as a human-machine interface making it possible to view a so-called window on the screen. "Local" and at least one window called “remote”.
- a videoconference terminal designate any terminal equipped with means making it possible to establish videoconference communications through a telecommunication network with one or more other videoconference terminals.
- an interlocutor having a videoconferencing terminal, may wish to broadcast a data file, in particular a multimedia file, to his interlocutors in real time.
- broadcasting to designate that the receiver never has at its disposal the broadcast file
- Multimedia files are for example video files that the caller has recorded and wants to comment on, musical extracts, or any other multimedia file that the terminal can use. These files are, for example, videos in MPEG-1 format, or music in MP3 format.
- a solution currently adopted in videoconferencing terminals consists in transmitting the multimedia file in its entirety to the interlocutor by a data channel separate from the audio and video channels of the communication. The interlocutors then receive the file as it exists on the sender's computer.
- a first problem comes from the fact that the operation is not really done in real time with the communication in progress, the transmission time depends on the size of the file and the available bandwidth of the separate channel used.
- the transmitter is required to carry out several operations and manipulations that are not very ergonomic, which has the consequence of temporarily breaking the communication.
- receivers may not have equipment capable of processing these files, (example: the transmitter wants to send a video encoded with the MPEG-1 standard to the receiver, the receiver does not have a decoder MPEG-1 so it cannot decode the file). - And finally, the transmitter makes its multimedia file available to its receivers, which it would like to be able to prevent.
- this solution poses, among other things, real time problems, ergonomics, communication breakdown and operational safety.
- the transmitter has for this purpose a list of primitives allowing it to transmit the events it generates, 2D images or screenshots of the videoconferencing terminal it uses.
- the transmitter does not have the ability to control the bandwidth it uses and does not have the ability to transmit audio data.
- the invention provides a method of broadcasting data files, in particular multimedia files, during a videoconference from a transmitting terminal capable of establishing communication with one or more receiving terminals, these terminals being equipped with audio and video sources, mainly characterized in that the broadcasting of the files is carried out in real time with the videoconference communication in progress, without breaking this communication, by using the audio and video channels open for this communication.
- the method further comprises a step implemented during the establishment of the videoconference communication consisting of a dialogue between the transmitting terminal and the receiving terminal or terminals in order to negotiate one or more communication parameters and, compliance during the broadcast. a multimedia file of the constraints set for said audio and video channels and those of the receiving terminal or terminals.
- a first negotiated parameter is the bandwidth allocated for the audio and video channels of videoconference communication, the multimedia files being broadcast in compliance with this negotiated bandwidth.
- a second parameter consists of the frequencies of the audio and video streams of the streams captured by the audio and video sources, the multimedia files being broadcast in compliance with these frequencies.
- a third parameter is the frame size of the broadcast images, the resulting images from video sources and from a multimedia file respecting the negotiated size.
- a fourth parameter is the coding standard for the bit streams of the audio and video sources, the bit streams of a multimedia file being coded with the coded (coding-decoding algorithm) negotiated.
- the video of a multimedia file to be broadcast is decoded and mixed in real time with the video originating from the video capture source of the transmitting terminal and then encoded according to the negotiated video coding standard.
- the audio data of a multimedia file to be broadcast is decoded and mixed in real time with the audio data from the audio capture source of the sending terminal and then coded according to the negotiated audio standard.
- the broadcasting is implemented by a program, the execution of which is launched by means of a man-machine interface implemented in the transmitting terminal.
- 1 / invention further relates to a man-machine interface for a terminal equipped with means making it possible to carry out videoconference communications and input-output devices, said interface comprising means of graphical representation making it possible to display several windows including one called "local" To view during a videoconference communication, a local video image broadcast to one or more remote terminals and at least one second window called “remote” to view at least one video image from a remote terminal, mainly characterized in that the means of graphical representation also make it possible to display at least one other window in order to display, in the form of icons, for example, data files, in particular multimedia files available from the terminal, said interface further comprising a logic module ensuring a coupling between selection operations of a file and of movement in the "remote" window and the launch by the videoconferencing means of a program allowing the broadcasting of said file in real time with the videoconferencing communication in progress, without breaking this communication, by borrowing the audio and video channels open for this communication.
- the interface is implemented by a computer program launched by videoconferencing
- the invention also relates to a computer terminal comprising means for implementing a videoconference mainly characterized in that it comprises a man-machine interface as described above.
- FIG. 1 represents the diagram of a videoconferencing system between a plurality of videoconferencing terminals
- FIG. 2 represents a view of a videoconferencing terminal TA for the transmitter A, during a communication
- FIG. 3 represents a view of a videoconferencing terminal TB for the receiver B during a communication
- FIG. 4 represents a view of the videoconferencing terminal TA for the transmitter A and of the interface
- FIG. 5 represents a view of the videoconferencing terminal TA for the transmitter A during the broadcasting of a file selected by said transmitter
- FIG. 6 shows a view of the videoconferencing terminal TB for the receiver during the broadcasting of the multimedia file
- FIG. 7 represents the broadcasting algorithm implemented according to the method by the videoconferencing terminal TA
- FIG. 8 represents the algorithm for receiving audio and video signals by a receiver terminal TB.
- the invention relates generally to a method of broadcasting data files during a videoconference. It applies particularly to the broadcasting of multimedia files during a videoconference from a videoconference terminal, this example being taken for the remainder of the description.
- the terminal TA of the transmitter A is equipped with means for implementing the method according to the invention. These means make it possible to broadcast a multimedia file in real time with a videoconference communication in progress, without breaking this communication, by using the audio and video channels open for this communication.
- These means are coupled to a Human-machine interface I which allows the transmitter to perform a very simple operation to distribute the desired file.
- the transmitter A wants to broadcast a video which it has on its computer and which it wants to comment on to its interlocutor B.
- the bit stream it sends to its interlocutor B consists of its image captured by a camera C then coded and its speech captured by one or more microphone M and coded.
- the video coding standard is for example the H.263 standard and the speech coding standard is for example in compliance with the G.71LA standard.
- FIG. 3 illustrates the view of the terminal TB for interlocutor B during the communication. The latter can see on his screen a "remote” window displaying the image transmitted by the TA terminal, and a "local” window of the image transmitted to A.
- the size of the transmitted frames eg 176 x 144 pixels
- the maximum bandwidth used eg 128 bps
- the maximum frame frequency eg 15 frames per sec
- audio and video coding standards used.
- the communication protocol used for this negotiation can for example be the H.323 standard.
- the communication itself After negotiation of these parameters, the communication itself begins; during this, the sender decides to broadcast a multimedia file in order to comment on it to his interlocutor.
- the transmitter A will use the human machine interface I for this purpose in accordance with the present invention. We can refer to understand the rest of the diagram in Figure 4.
- the transmitter A directs the pointer of the mouse of his computer, on the icon of the file which he wishes to diffuse to B, seizes it by pressing the right button of the mouse and slides it on the "remote” window. If it does not drop the icon on a "remote” window of the terminal, nothing happens and the communication continues. If the icon is placed on one of the windows belonging to the man-machine interface, we start broadcasting the multimedia file to receiver B.
- the operation requires a click and a mouse movement, a few seconds. Issuer A can do it without taking his eyes off his terminal. videoconference, and therefore without suspending the communication.
- the interface is produced by the means of graphic representation of the terminal and a PROG-F logic module.
- This logic module is a program which ensures the coupling between the operations of selecting a file and moving in the "remote" window and the launching of a PROG-D program allowing the dissemination of said file in real time with videoconference communication. in progress, without breaking this communication, by using the audio and video channels open for this communication.
- the broadcasting is carried out under the constraints and conditions negotiated at the initiation of the communication (image size, coded (coder-decoder) used, bandwidth), which ensures the proper functioning of the decoding, on the receiver side. In addition, it does not require renegotiation of parameters or the opening of new audio and video logical channels, since we use those open for communication.
- the local image captured by the camera C of the transmitter A is replaced by the video contained in the file F broadcast and an overlay of the video of the transmitter A
- the sound coming from transmitter A is mixed with the audio data contained in the multimedia file (if there is one), which allows continuity of communication, the visual and sound link between the two parties not being broken.
- the diffusion process is implemented by the algorithm illustrated in FIG. 7, which is executed by the PROG-D program produced for this purpose. This algorithm takes place during the execution of a computer program made for this purpose. Execution is activated when the transmitter A carries out the operations of selecting a file and moving in the "remote" window of a contact using the PROG-F program module.
- This algorithm for broadcasting a multimedia file is implemented on the terminal of the transmitter A.
- the terminal TB receives data from the network and processes it conventionally as illustrated by the algorithm of FIG. 8 .
- the steps are as follows: 10-
- a dialogue is established between the sending terminal and the receiving terminal (s) in order to preferentially negotiate several communication parameters in order to respect the constraints set for said channels, audio and video and those of the receiving terminal (s), during the broadcasting of a multimedia file.
- multimedia data files are stored on any medium: hard drive of the TA terminal, floppy disk or other,
- 110- Audio data is captured by the audio source (one or more microphones)
- 120- video data are captured by the video source (one or more cameras)
- the data in the multimedia file are processed to be transmitted over the network respectively in an audio processing chain 210 and in a video processing chain 220,
- the data from the audio capture 110 are mixed with the data from the audio processing chain 210, and the data from the video capture 120 are mixed with the data from the video processing 220,
- Coding 420 is carried out with the audio standards adopted for the communication. Coding 420 is carried out with adopted video standards.
- the data is transmitted over the network from the audio and video logical channels of the videoconference.
- the audio processing chain 210 comprises the steps of extracting audio data -211, of decoding -212, of frequency adaptation -213 and of stereo / video adaptation -214.
- the video processing chain 220 includes the steps of extracting video data -221, decoding -222, spatial sampling -223 and temporal sampling -224.
- Respect for bandwidth the channels used for broadcasting being the logical channels already open for communication, we still use the audio and video bandwidth management mechanisms that before the diffusion. Thus, one never exceeds the bandwidth allocated for such or such channel.
- the frequencies of the video and audio streams in the multimedia file can be different from the negotiated frequencies, so we make sure to respect the frequencies of the streams captured by the audio and video sources, considered as masters. For example, if the frame rate negotiated during the communication is 15 images per second and the multimedia file is sampled at 30 images per second, only one image out of two of the multimedia file will be broadcast.
- Respect of the frame size the resulting image of the master flow and the slave flow is resized if necessary to register in the size negotiated at the start of the communication.
- the coded bit stream sent to the contact person made up:
- raw video captured by the camera and decoded video from the multimedia file (we mix the real-time image of the transmitter and MPEG-1 video from the multimedia file and is encoded with an H.263 encoder).
- Such a mechanism ensures the dissemination of multimedia data in the negotiated format of videoconferencing (audio and video coding standard, bandwidth, etc.) and therefore good decoding on the receiver side.
- B does not need any other equipment than that which he usually uses.
- FIG. 8 illustrates the algorithm for decoding data coming from the network on the receiver side, that is to say on the terminal side TB.
- This algorithm includes the following steps:
- the invention which has just been described therefore relates to an intuitive human-machine interface and the technological tools necessary for the dissemination of multimedia files in real time during a videoconference.
- This interface and these broadcasting tools allow continuity of communication between participants, and ensure that all receivers will be able to see and hear the files broadcast, while respecting the constraints. communication negotiations (bandwidth constraint, real-time constraint).
- the distribution of multimedia files is done in a transparent manner for the receiver, that is to say that it does not need any other equipment than that which it uses for videoconferencing. .
- the open video and audio logical channels of the communication are used to transmit the data of the mixed multimedia file (or unmixed if the file has no audio or video data for example) with the data generated by the transmitter, then coded with the codes used for communication.
- This mechanism distributes the file to the receiver, and this distribution is done under the same communication constraints (real time, bandwidth never exceeded, etc.).
- we couple this broadcasting process with an intuitive Human-Machine interface, which requires only a few mouse operations and ensures the continuity of the visual and sound link between the participants in the videoconference.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Telephonic Communication Services (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03755638A EP1529399A1 (fr) | 2002-08-12 | 2003-07-28 | PROCEDE DE DIFFUSION EN TEMPS REEL DE FICHIERS MULTIMEDIAS AU COURS D UNE VISIOCONFERENCE, SANS RUPTURE DE COMMUNICATION, ET INTERFACE HOMME-MACHINE POUR LA MISE EN ŒUVRE |
AU2003273478A AU2003273478A1 (en) | 2002-08-12 | 2003-07-28 | Method for real-time broadcasting of multimedia files during a videoconference, without interrupting communication, and man-machine interface therefor |
JP2004528576A JP2005536132A (ja) | 2002-08-12 | 2003-07-28 | 通信を中断することなしにビデオ会議中でのマルチメディアファイルのリアルタイム放映を行う方法と実行のための人間/機械インターフェイス |
US10/524,365 US7710449B2 (en) | 2002-08-12 | 2003-07-28 | Method for real-time broadcasting of multimedia files during a video conference, without interrupting communication, and a man-machine interface therefor |
CA002492428A CA2492428A1 (fr) | 2002-08-12 | 2003-07-28 | Procede de diffusion en temps reel de fichiers multimedias au cours d'une visioconference, sans rupture de communication, et interface homme-machine pour la mise en oeuvre |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0210241A FR2843516B1 (fr) | 2002-08-12 | 2002-08-12 | Procede de diffusion en temps reel de fichiers multimedias au cours d'une visioconference, sans rupture de communication, et interface homme-machine pour la mise en oeuvre |
FR02/10241 | 2002-08-12 |
Publications (1)
Publication Number | Publication Date |
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WO2004017636A1 true WO2004017636A1 (fr) | 2004-02-26 |
Family
ID=30471095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/002365 WO2004017636A1 (fr) | 2002-08-12 | 2003-07-28 | Procede de diffusion en temps reel de fichiers multimedias au cours d'une visioconference, sans rupture de communication, et interface homme-machine pour la mise en oeuvre |
Country Status (8)
Country | Link |
---|---|
US (1) | US7710449B2 (fr) |
EP (1) | EP1529399A1 (fr) |
JP (1) | JP2005536132A (fr) |
KR (1) | KR20050053604A (fr) |
AU (1) | AU2003273478A1 (fr) |
CA (1) | CA2492428A1 (fr) |
FR (1) | FR2843516B1 (fr) |
WO (1) | WO2004017636A1 (fr) |
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- 2003-07-28 US US10/524,365 patent/US7710449B2/en active Active
- 2003-07-28 CA CA002492428A patent/CA2492428A1/fr not_active Abandoned
- 2003-07-28 AU AU2003273478A patent/AU2003273478A1/en not_active Abandoned
- 2003-07-28 EP EP03755638A patent/EP1529399A1/fr not_active Ceased
- 2003-07-28 WO PCT/FR2003/002365 patent/WO2004017636A1/fr active Application Filing
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Also Published As
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EP1529399A1 (fr) | 2005-05-11 |
JP2005536132A (ja) | 2005-11-24 |
AU2003273478A1 (en) | 2004-03-03 |
FR2843516B1 (fr) | 2004-12-24 |
CA2492428A1 (fr) | 2004-02-26 |
US7710449B2 (en) | 2010-05-04 |
US20060152575A1 (en) | 2006-07-13 |
KR20050053604A (ko) | 2005-06-08 |
FR2843516A1 (fr) | 2004-02-13 |
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