EP1188318A1 - Systeme et procede pour obtenir un fichier video numerique de haute qualite - Google Patents

Systeme et procede pour obtenir un fichier video numerique de haute qualite

Info

Publication number
EP1188318A1
EP1188318A1 EP00944619A EP00944619A EP1188318A1 EP 1188318 A1 EP1188318 A1 EP 1188318A1 EP 00944619 A EP00944619 A EP 00944619A EP 00944619 A EP00944619 A EP 00944619A EP 1188318 A1 EP1188318 A1 EP 1188318A1
Authority
EP
European Patent Office
Prior art keywords
file
digital video
video
pixels
streaming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00944619A
Other languages
German (de)
English (en)
Inventor
Eliot I. Bernstein
Brian G. Utley
Jude R. Rosario
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iviewit Holdings Inc
Original Assignee
Iviewit Holdings Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iviewit Holdings Inc filed Critical Iviewit Holdings Inc
Publication of EP1188318A1 publication Critical patent/EP1188318A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6377—Control signals issued by the client directed to the server or network components directed to server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
    • H04N1/3872—Repositioning or masking
    • H04N1/3873—Repositioning or masking defined only by a limited number of coordinate points or parameters, e.g. corners, centre; for trimming
    • H04N1/3875—Repositioning or masking defined only by a limited number of coordinate points or parameters, e.g. corners, centre; for trimming combined with enlarging or reducing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365—Multiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server
    • H04N21/6587—Control parameters, e.g. trick play commands, viewpoint selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal

Definitions

  • the present invention relates generally to video imaging. More specifically, the present invention relates to a system and method for providing high quality digital video files for streaming across a network.
  • Streaming video is a technique by which video is played in real time as it is downloaded over the Internet, as opposed to storing it in a local file first.
  • a video player decompresses and plays the data as it is transferred to a user computer over the World-Wide Web.
  • Streaming video avoids the delay entailed in downloading an entire file and then playing it with a plug-in application.
  • Streaming video requires a communications connection (e.g., a network, Internet, etc.) and a computer powerful enough to execute the decompression algorithm in real time.
  • One teaching in the art is to reduce the number of frames per second that are being encoded, from the 25 to 30 fps of standard television to 6 or 7 fps or less for streaming video. While this reduces the amount of data that is being sent, the video appears jittery and corresponding voice appears asynchronous with the jittery video.
  • Another teaching in the art is to capture the video at a small frame size of 1 60 x 1 20 or less. The small frame size of 1 60 x 1 20 is the widely used standard in Internet streaming video. Further teachings are directed to reducing the amount of data that is provided prior to compressing to reduce the file size resulting from compression.
  • a method of providing a streaming video file includes providing digital video data having a capture frame size of at least 69,300 pixels per frame and converting the digital video data to a streaming video file having a i s converted frame size of at least 69,300 pixels per frame.
  • a method of providing a streaming video file includes providing digital video data having a capture frame rate of at least 24 frames per second and converting the digital video data to a streaming video file having 20 a converted frame rate of at least 24 frames per second.
  • a method of providing a streaming video file includes obtaining a source video signal having a predetermined source video parameter; capturing the source video signal while maintaining substantially the 5 same source video parameter to provide a captured digital video file; and encoding the captured digital video file while maintaining substantially the same source video parameter to provide a streaming video file.
  • a method of generating a streaming video file for streaming over the Internet includes providing digital video data having a capture frame size of at least 320 x 240 pixels; compressing the digital video; data; encoding the digital video data into a streaming video file, wherein the streaming video file has a frame size of at least 320 x 240 pixels; uploading the streaming video file to an Internet server.
  • a system for providing a streaming video file includes means for providing digital video data having a capture frame size of at least 320 x 240 pixels and means for converting the digital video data to a streaming video file having a converted frame size of at least 320 x 240 pixels.
  • a system for providing a streaming video file includes means for providing digital video data having a capture frame rate of at least 24 frames per second and means for converting the digital video data to a streaming video file having a converted frame rate of at least 24 frames per second.
  • FIG. 1 is a block diagram of a system for generating an enhanced digital video file according to an exemplary embodiment
  • FIG. 2 is a flowchart of a method for generating an enhanced digital video file according to the exemplary embodiment of FIG. 1 ;
  • FIG. 3 is a block diagram of a system for playing a digital video file across a network.
  • System 1 0 for generating an enhanced digital video file is shown.
  • System 1 0 may be used as shown, or portions of system 1 0 may be integrated with other video processing systems, such as medical imaging equipment, motion picture production equipment, etc.
  • System 10 generates a digital video file expandable to a full screen size and having a real video frame rate (i.e., life-like, smooth, not jerky, comparable with recorded video formats, such as, NTSC (National Television Standards Committee) at 29.97 frames per second (fps), PAL (Phase Alternative Line) at 25 fps, and SECAM (Sequentiel Couleur Avec Memoire) at 25 fps)) with a file size that is suitable for streaming over the Internet, for such uses as high definition television, Web television, computers and servers utilized in wireless environments, etc.
  • NTSC National Television Standards Committee
  • PAL Phase Alternative Line
  • SECAM Suddens Couleur Avec Memoire
  • video is recorded having certain standard recorded video parameters, such as, frame rate, and number of lines scanned.
  • a source conforming to the NTSC (National Television Standards Committee) standard operates at 29.97 frames per second (fps)
  • a source conforming to the PAL (Phase Alternative Line) standard operates at 25 fps
  • a source conforming to the SECAM (Sequentiel Couleur Avec Memoire) standard operates at 25 fps.
  • the NTSC standard includes two interleaved frames at 240 lines scanned, while the PAL standard is 270 lines scanned. Note that the number of lines scanned corresponds to the number of vertical pixels in a standard 320 x 240 frame size compatible with standard capture cards, such as, a Dazzle LAV-1 000S capture device manufactured by Dazzle, Inc. of Fremont, California.
  • System 1 0 includes one or more sources, including recording devices 1 2 or playback device 25, a capture device 1 4, a computer 1 6, and a network server 1 8.
  • Recording devices 1 2 include a camcorder 20, a digital video camera 22, and a reel-to-reel camera 24, each of which may be hand-held or mounted on a tripod or stand.
  • System 1 0 may include a playback device 25 (e.g., tape player, VHS (Vertical Helix Scan) player, Beta player, DVD (Digital Versatile Disk) player, etc.) .
  • Camcorder 20 may be a VHS recorder, Beta recorder, or other camcorder, and is configured to store video on magnetic tape.
  • Digital video camera 22 may be any type of digital video camera configured to generate video in a digital format.
  • digital video camera 22 stores the digital video data to a tape.
  • Digital video camera 22 is configured to provide digital video data in real time or via the tape in a digital format, such as, Beta digital, AVI, MOV, MPEG (Motion Picture Experts Group), or other format compatible with the IEEE 1 394 standard, etc., to capture device 1 4.
  • AVI is an audio/video standard designed by Microsoft Corp., Redmond, Washington.
  • a digital video camera including 3CCD technology is used to record the video.
  • the 3CCD technology (3- chip charge-coupled device) includes a dichroic prism and three CCDs, each CCD being aligned to detect only the red, green, or blue color.
  • a 3CCD camera will provide enhanced color resolution.
  • Reel- to-reel camera 24 includes recording equipment that uses magnetic tape which must be threaded through the equipment and onto an empty reel.
  • a separate audio recording device such as a microphone, may be utilized in conjunction with recording devices 1 2, in which embodiment recording devices 1 2 are used to record only video.
  • Other recording devices may be used, such as, devices optimized for live videoconferencing.
  • Computer 1 6 includes a processor, memory, magnetic storage device, input/output devices and circuitry, etc.
  • Computer 1 6 may include multiple computer at multiple sites, with different portions of the process described hereinafter operating on different computers.
  • Capture device 1 4 is coupled to one or more of sources 1 1 .
  • Capture device 1 4 is shown external to computer 1 6, but may alternatively be an internal capture device coupled within the housing of computer 1 6 or an internal capture device within the housing of one of recording devices 1 2 or playback device 25.
  • a Dazzle LAV-1 000S capture device is utilized, though other capture devices may be used, such as a Pinnacle DC1 0PLUS or Pinnacle DC30PRO device, both manufactured by Pinnacle Systems, Inc., Mountain View, California, or a MotoDV Mobile capture device, manufactured by Digital Origin, Inc., Mountain View, California.
  • Capture software 26, such as Amigo 2.1 1 , manufactured by Dazzle, Inc.
  • capture device 1 4 is configured to receive a video signal from one of recording devices 1 2 or playback device 25, to digitize the video signal, and to store the video signal as a digital video file.
  • the parameters of the video capture will be discussed below with reference to FIG. 2.
  • the digital video file is an MPEG-1 file in this exemplary embodiment, but may alternatively be generated in other digital video formats, such as, MPEG-2, AVI, etc.
  • Capture device 14 is a combined audio/video capture device, but may alternatively include discrete audio and video capture devices, the audio capture device configured to digitize any audio which corresponds to the video being captured by the video capture device. As a further alternative, audio captured device may be utilized alone without a video capture device.
  • the audio capture device may be, for example, a Montego II device, manufactured by Voyetra Turtle Beach, Inc., Yonkers, New York, and configured to generate a digital audio file in a digital audio format, such as, PCM (Pulse Code Modulation) .
  • Editing software 28 is operable on computer 1 6. In this exemplary embodiment, Adobe Premier 5.1 is utilized, though other video editing software may be used. Editing software 28 receives the captured digital video file and enables an operator to edit the digital video file by adding or deleting frames, adjusting the color, contrast, and brightness of the frames, etc. The edits are then saved to the digital video file or can be exported to AVI or MOV file types.
  • Encoding software 30 is operable on computer 1 6. In this exemplary embodiment, RealProducer G2 is utilized, though other encoding software may be used. Encoding software 30 receives the edited digital video file and encodes the digital video file into an encoded format, such as, an RM format. Encoding software 30 may also compress the digital video file, if needed, to reduce the size of the digital video file, using a video compression algorithm, such as MPEG-1 , MPEG-4, etc.
  • a video compression algorithm such as MPEG-1 , MPEG-4, etc.
  • Markup software 32 is operable on computer 1 6.
  • a hypertext markup language e.g., HTML, Dynamic HTML, Cold Fusion
  • An operator marks up the encoded digital video file in HTML to prepare the digital video file for uploading to the network server 1 8.
  • a code segment representing a full screen frame size such as 640 x 480 pixels, is associated with the digital video file in the HTML code.
  • the full screen frame size code segment may alternatively include other screen sizes, such as 800 x 600 pixels, 1 024 x 768 pixels, 1 280 x 1 024 pixels, and 1 600 x 1 200 pixels.
  • the full screen frame size code segment causes or enables a video player program, such as RealPlayer, manufactured by RealNetworks, Inc., to enlarge the streaming video to a full screen frame size, such as 640 x 480 pixels.
  • a video player program such as RealPlayer, manufactured by RealNetworks, Inc.
  • references herein to frame sizes in pixels are intended to include equivalent frames sizes thereto.
  • a frame size of 320 x 240 pixels may include an additional number of unneeded pixels (e.g., which can be as much as 1 0% of the total pixels) attributed to overscan.
  • one equivalent to a 320 x 240 pixel frame size is 304 x 228 pixels.
  • the exact pixel count differs from the stated frame size.
  • one equivalent to a 320 x 240 pixel frame size is 352 x 240.
  • the uploading process utilizes uploading software 33, such as, a Web FTP (file transfer protocol) software (e.g., WS FTP PRO, manufactured by Ipswitch, Inc., Lexington, Massachusetts.)
  • the digital video file is uploaded to network server 1 8, which includes a computer configured to generate a web page on an internet-protocol network, such as the Internet or a company-wide intranet.
  • a web page is a block of data written in a markup language, such as HTML, and any related files for scripts and graphics.
  • Network server 1 8 may alternatively be coupled to a non- internet-protocol network, such as, an ethernet, a local area network, a wide area network, a wireless network, etc.
  • a user computer 34 may access the web page provided by network server 1 8 via a network, such as, the Internet.
  • a user input device e.g., a web page button, hypertext link, etc.
  • the HTML code launches a suitable video player program (e.g., RealPlayer) at user computer 34, activates the full screen frame size at user computer 34, and streams the video from the digital video file to user computer 34.
  • the video player program may initially play the streaming video at a smaller frame size (e.g., 320 x 240), and the user may actuate a user input device on the video player to enlarge the streaming video to a full-screen size, such as 640 x 480.
  • capture software 26, editing software 28, encoding software 30, markup software 32, and uploading software 33 may be operable on one computer or on different computers during different steps in the process.
  • the encoded digital video file is stored directly to a storage device, such as, a compact disk, a digital video disk, a magnetic storage device, etc., for subsequent viewing on another computer, on a personal digital assistant (e.g., a Palm Pilot manufactured by Palm, Inc., Santa Clara, California), etc.
  • digital video data is provided on a storage device (e.g., a floppy disk, a hard disk storage, etc.) which has been pre-captured.
  • the pre-captured digital video data is provided in a compressed or uncompressed digital video format to encoding software 30 for subsequent processing.
  • Method 50 is operable using one or more of the elements of system 1 0, as needed. While the steps of method 50 are explained with reference to captured video, it is understood that captured audio may be processed along with the captured video, or perhaps processed independently in a similar manner. As will be seen, the recorded video will be captured and encoded at near- optimal levels, as determined by the selected parameters in these processes, thereby preserving the highest quality video content. While exemplary values are presented herein for such parameters, it is understood that one of ordinary skill in the art will recognize other combinations of parameters based on these teachings.
  • a customer provides pre-recorded video saved to a disk or other storage device.
  • the method proceeds to step 58.
  • video is recorded using one or more of recording devices 1 2 or playback device 25.
  • the video is recorded into any suitable format, such as, VHS or Beta, and is played back using a television standard, such as, NTSC (National Television Standards Committee), PAL (Phase Alternative Line) , SECAM (Sequentiel Couleur Avec Memoire), a digital format, such as, AVI, MOV, MPEG, a digital format compatible with the IEEE 1 394 standard, or another format, etc.
  • the video is captured by coupling one of recording devices 1 2 or playback device 25 to capture device 1 4, which is an external Dazzle LAV-1 000 capture device in this exemplary embodiment, but may alternatively be an internal card or other capture devices, such as a Pinnacle DC1 0 device.
  • Capture software is also utilized, such as, Amigo 2.1 1 , Adobe Premier 5.1 or Real Producer G2.
  • Capture device 1 4 and capture software 26 generate a digital video file based on the recorded video. If the recorded video is in an analog format, capture device 1 4 digitizes the analog video to create digital video data. If the recorded video is in a digital format, capture device 1 4 merely receives the digital video data and formats a file in the appropriate standard (e.g., AVI, MOV, MPEG 1 , etc.) .
  • capture software 26 is set for real video capture, i.e., having a frame rate of a television or movie standard, such as, 29.97 frames per second.
  • Real video capture may further have a frame rate of between 24 and 30 frames per second, or at least substantially more than the 6 to 9 frames per second conventionally used in streaming video applications. Further, the video is captured with at least approximately 76,800 pixels per frame (at least approximately 69,000 pixels taking into consideration overscan) .
  • the frame size of the video capture is at least 320 x 240 in this exemplary embodiment (at least 304 x 228 taking into consideration overscan), or at least more than the 1 60 x 1 20 used in conventional streaming video applications.
  • Frame sizes of 480 x 320 and 640 x 480 may also be utilized in the video capture. However, particularly advantageous results are associated with the 320 x 240 capture frame size.
  • a separate audio capture device is utilized in parallel with the video capture device.
  • corresponding audio capture software is operable on computer 1 6 to digitize the audio into a digital audio format, such as PCM.
  • the sampling rate is between 44 and 48 kiloHertz (kHz); the bus size is 1 6-bit, allowing an audio resolution of 1 6-bits; and the audio is sampled in stereo.
  • the captured video data may be stored as a data file in a storage device (e.g., a hard drive) or may be stored in memory and fed directly to an encoder.
  • the captured video data may further be compressed, for example, to an MPEG-1 file before being saved to the storage device.
  • the digital video file is edited using a video editing software, such as, Adobe Premier 5.1 .
  • Adobe Premier 5.1 generates an output file in a MOV or AVI format, but may alternatively generate an output file in any digital video format.
  • the edited digital video file may be stored in the storage device.
  • Step 58 is optional but, if included, preferably Adobe Premier 5.1 maintains a frame size of at least 320 x 240 pixels and a real video frame rate.
  • the edited digital video file is converted or encoded using a video encoding algorithm to create a streaming video file.
  • the edited digital video file is first retrieved from the storage device (unless the digital video data is provided directly from capture device 1 4) .
  • the digital video file is encoded to a RealMedia format (i.e., RM) using a RealNetworks encoding algorithm.
  • RM is an audiovisual file format proprietary to RealNetworks, Inc.
  • Windows Media Encoder manufactured by Microsoft Corp.
  • ASF Advanced Streaming Format
  • ASX Advanced Streaming Format
  • QuickTime manufactured by Apple Computer, Inc., Cupertino, California, may be utilized to encode the captured digital video file, for example, to an MOV format.
  • Encoding may additionally include compression, if a smaller file size is desirable, as indicated by steps 62 and 64.
  • the amount of compression may be selected by the operator using encoding software 30 or alternative compression software.
  • the digital video file is encoded to have a data rate of between approximately 35 kbps (kilobits per second) to 750 kbps, and a frame rate of between approximately 24 fps (frames per second) and 30 fps (e.g. 29.97 fps.) .
  • the number of pixels per frame is set to at least approximately 76,800 (again, at least approximately 69,000 pixels taking into consideration overscan) which, for a 4:3 aspect ratio, is 320 x 240 pixels (again, at least 304 x 228 pixels taking into consideration overscan), or at least more than the 1 60 x 1 20 pixels of conventional usage.
  • editing, encoding, and compression are optional steps.
  • the digital video file is marked up with a markup language, such as, HTML.
  • a full screen frame size is associated with the digital video file.
  • a full screen frame size is at least 640 x 480 pixels, and may also be 800 x 600 pixels, 1 024 x 768 pixels, 1 280 x 1 024 pixels, 1 600 x 1 200 pixels, etc.
  • the markup language associated with the digital video file includes a code segment that causes the digital video file to stream at the desired full screen frame size. While the markup language is used to associate the full screen frame size code segment with the digital video file in this exemplary embodiment, the full screen frame size code segment may be associated with the digital video file in another step of the method, such as the encode step 60, compression step 62, or another step.
  • the digital video file is uploaded to an Internet web page using uploading software, such as, WS FTP PRO.
  • a script e.g., an ASCII file (American Standard Code for Information Interchange)
  • the script calls the video to stream in response to a user actuation from user computer 34.
  • the script is written in a RAM format, such as from a Microsoft Notepad software program.
  • the script is included in the markup language associated with the digital video file.
  • an actuatable user input device e.g., a hypertext link
  • HTML code e.g., a hypertext link
  • a user from anywhere in the world may access network server 1 8 via the internet, actuate the user input device, and call the video to stream.
  • the HTML codes launch video playing software (e.g., RealPlayer) at the user computer, enlarge the viewing window of the software to full screen mode (i.e., at least 640 x 480), and begin streaming the video to the user computer.
  • video playing software e.g., RealPlayer
  • the user may expand the viewing screen to full screen mode by actuating an input device on the video player software.
  • Other methods of expanding the viewing screen to a full screen are contemplated .
  • the transmission speed of the digital video file is dependent upon the bandwidth of the user's network connection, but may range from approximately 35 kbps to 750 kbps, or as low as 28.8 kbps, with a frame rate of between approximately 24 fps to 29.97 or 30 fps.
  • network server 1 8 is configured to query user computer 34 to ascertain the network connection used by computer 34 (e.g., 28.8 kbps modem, T1 line, ISDN, etc.) . Thereafter, network server 1 8 determines the appropriate transmission rate based on the ascertained network connection.
  • the network connection used by computer 34 e.g., 28.8 kbps modem, T1 line, ISDN, etc.
  • the video camera generated an output signal of 6MHz in NTSC format.
  • a Dazzle LAV-1 000S external capture device was coupled to the video camera.
  • Amigo 2.1 1 Dazzle's capture software was used.
  • the Dazzle capture device and capture software were programmed with several parameters.
  • the frame size was left at the default setting of 320 x 240 pixels.
  • the frame speed was set to 29.97 frames per second.
  • the bit rate was set to 3.0 Megabits (Mb) per second.
  • the audio capture was set to 44 kHz, 1 6 bit sampling rate.
  • An MPEG-1 file was generated based on the video signal using the capture device and software programmed with these parameters.
  • Adobe Premier 5.1 was utilized to receive the MPEG-1 file and export it to a MOV or AVI or MPEG file., based on several parameters.
  • the frame rate in Adobe Premier 5.1 was set to 29.97 fps.
  • the frame size was set to 320 x 240.
  • the "Quality" setting representing the number of colors to appear in the edited file, was set to a high setting (e.g., 1 00%) .
  • Adobe Premier 5.1 generated an AVI file or an MOV file or a MPEG file, depending upon the operator selection.
  • RealEncoder G2 software was used to encode the AVI or MOV file into a streaming video file in RM format.
  • the RealEncoder G2 software was programmed with several parameters. The bitrate was set to 220 kbps. The frame rate was set to 30 fps.
  • the "Surestream” option was selected. "Surestream” technology adjusts the playing speed of the encoded digital video file to accommodate the network connection speed of the user. For sound quality, "stereo/music", the highest quality, was selected . For image quality, “sharpest image”, the highest quality, was selected. Regarding frame size, this version of RealEncoder generated an output signal having a frame size equal to that of the frame size of the MOV or AVI input file. RealEncoder compressed the MOV or AVI input file using the RealNetworks compression algorithm. An RM file was generated based on the these parameters.
  • the RM file was uploaded to an Internet server. Using Microsoft Notepad, a script was written in RAM format to 1 ) identify the location of the RM file, 2) launch RealPlayer on the user computer, 3) resize the viewing screen on the user computer to 640 x 480, and 4) begin the video stream.
  • the result was unexpectedly high-quality, full-screen, real video frame rate, streaming video.
  • the RM file was subsequently streamed to a client computer via a telephone modem and via other broadband connections. The same unexpectedly high-quality, full-screen, real video frame rate, streaming video was experienced.
  • the streaming playback was intermittent due to the need to buffer to accommodate the lower bit- rate of transmission.
  • an NTSC analog signal is provided to a Pinnacle DC-10PLUS capture device.
  • the Pinnacle capture device and associated software generate a digital video file in AVI format based on several parameters.
  • the capture type is set to NTSC.
  • the frame size is set to 320 x 240 pixels, or "1 /4 full frame size". Brightness, sharpness, and color are adjusted, as desired.
  • the compression rate is set to 2.5: 1 .
  • the frame rate is set to 29.97. Square pixel ratio is selected. Audio is set to stereo format, 44 kHz, 1 6 bit sampling.
  • the data rate is set to 1 739 kbps.
  • the capture device utilizes a Miro codec to create a digital video file in AVI format.
  • a header and footer is provided to the beginning and end of the digital video file.
  • the header and footer include a trademark for the assignee of the present application.
  • Adobe Premier is used to render the header, footer, and watermark to the digital video file.
  • a parameter within Adobe Premier is set to a frame size of 320 x 240.
  • Adobe Premier further utilizes a Miro codec to create a digital video file in AVI format.
  • the edited AVI file is encoded by RealProducer software.
  • the following parameters are programmed in the RealProducer software.
  • One set of parameters was used for a low- speed network connection at the user computer (hereinafter designated "LO"), and another set of parameters was used for a high-speed network connection at the user computer (hereinafter designated "HI") .
  • RealNetworks "Surestream” technology is selected. Alternatively, “single-stream" can be selected, and an
  • RAM file can be generated to query the connection speed of the user computer and stream the video at the proper connection speed.
  • the encoding speed is set to, for LO, 28 kbps or 56 kbps, and for HI, LAN, DSL, Cable Modem, or T1 .
  • Sound quality is set to "voice only” or “stereo music” or “CD quality”.
  • Video quality is set to "sharper image”.
  • Frame rate is set to 29.97 fps.
  • Target bit rate is set to 350 kbps.
  • the target player is specified as RealPlayer G2.
  • Frame size is set to 320 x 240. Based on these parameters, the RealEncoder software generates an RM file or other streaming video data file, which is subsequently uploaded to RealServer.
  • the exemplary embodiments disclosed herein provide greatly enhanced streaming video suitable for streaming over a limited-bandwidth network, such as the Internet.
  • a limited-bandwidth network such as the Internet.
  • the first discovery was that the efficiency of encoding from a captured digital video file to a streaming video file is increased with an increase in the frame size of the captured digital video file.
  • conventional teachings pointed toward minimizing the capturing and encoding frame sizes (typically to 1 60 x 1 20 pixels, which has widely become an Internet standard for streaming video) to reduce the size of the resulting file
  • the present inventors turned away from these teachings and increased the capturing and encoding frame sizes to 320 x 240 pixels.
  • one goal of the present inventors was to achieve full-screen, real video frame rate, streaming video.
  • RealProducer G2 taught away from real video streaming since digital video files that were captured at a real video frame rate (e.g., 30 fps) would be automatically reduced to a lower, non-real video frame rate (e.g ., 1 5 fps) to reduce the size of the streaming video file. Furthermore, digital video files which were captured directly from a capture device using RealProducer G2 were encoded at a frame rate of only 6-7 fps and had no option to adjust frame size.
  • a real video frame rate e.g. 30 fps
  • non-real video frame rate e.g ., 1 5 fps
  • System 80 includes a network server 82 having a processor 84, a storage device 86, and a network interface 88.
  • a capture device 90 is coupled to network server 82 and is configured to capture a video signal, as described hereinabove.
  • Processor 84 controls capture device 90 and provides various parameters to capture device 90 regarding frame size, bit rate, etc.
  • processor 84 may implement one or more of the methods for capturing video and generating a digital video file described hereinabove.
  • Processor 84 and capture device 90 generate a digital video file in a digital video format (e.g., MPEG, AVI, etc.) and store it to storage device 86.
  • a digital video format e.g., MPEG, AVI, etc.
  • storage device includes such devices as magnetic tape, a hard drive, a floppy disk, magnetic disk, or other similar non-volatile storage media, but not including random access memory or other temporary memory.
  • the capture process may alternatively be carried out on another computer, after which the resulting digital video file is stored in (e.g., uploaded to) storage device 86.
  • Network server 82 is coupled through network interface 88 to a network 92, such as the Internet, a LAN, etc.
  • Processor 84 is configured to generate a web page having a hypertext link to the digital video file stored in storage device 86.
  • a network client 94 includes a processor 96, a storage device 98, an input device 1 00, a display 1 02, and a network interface 1 04.
  • Network client 94 is operable via a user to access the web page generated by network server 82 and to actuate the hypertext link to begin downloading the digital video file from storage device 86.
  • One drawback of downloading video files is that, for very large files, the delay before any portion of the digital video file can be viewed can be on the order of minutes, hours, or longer.
  • system 80 while the digital video file is being downloaded to network client 94 and stored in storage device 98, some of the digital video file which has already been downloaded and stored is being simultaneously played on display 1 02.
  • a suitable player which supports AVI, MPEG, and other digital video formats is utilized for the video play. This procedure may be referred to as viewing/downloading.
  • a first portion of the digital video file is played from storage device 98 while later portions of the digital video file are still downloading from storage device 86 via network 92 to storage device 98.
  • One method of launching the player and beginning the play of the first portion is for a user to simply select these steps via input device 1 00 (e.g., a mouse, a keyboard, etc.) a certain time after the downloading has begun.
  • input device 1 00 e.g., a mouse, a keyboard, etc.
  • an algorithm may be provided, either attached to the digital video file (e.g., HTML, Java, a macro, etc.) or as part of the player (e.g., QuickTime, RealPlayer, etc.) which begins playing the digital video file at a predetermined time after the download to storage device 98 has begun. This predetermined time may be pre-programmed or adjusted in real-time based on inputs from client server 94 or network server 82.
  • the algorithm calculates the predetermined time based on the download speed (e.g., including network connection speed of network interface 1 04, etc.), the viewing speed (e.g., frames per second, etc.), and the size of the digital video file. For example, if the viewing speed is four times the download speed, the algorithm monitors the amount of the file (e.g., in bytes) which is downloaded until 75 % of the file is downloaded. When 75 % of the file is downloaded, the algorithm begins playing the digital video file from storage device 98. By playing the file at this predetermined time, the digital video file will play substantially without delays for buffering. Of course, other predetermined times are contemplated, including those earlier and later than that set forth in this exemplary embodiment.
  • network client 94 retains a copy of the digital video file in storage device 98 for later playing.
  • the digital video data is captured in real-time and streamed in real-time across network 92 (i.e., without first storing to storage device 86) to storage device 98.
  • FIGS, and described above are presently preferred, it should be understood that these embodiments are offered by way of example only.
  • the steps of the exemplary embodiments contemplate recording audio and video at one time and streaming the audio and video at another time
  • the audio and video may alternatively be fed through system 1 0 in realtime, thereby facilitating real-time audio/video transmissions.
  • the exemplary software programs mentioned may be replaced by newly developed versions and/or programs in the future. Accordingly, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Abstract

L'invention concerne un système et un procédé pour obtenir un fichier vidéo en continu, consistant à utiliser des données vidéo numériques avec une dimension d'image de capture d'au moins 69 300 pixels par image, et à convertir les données vidéo numériques en fichier vidéo numérique en continu avec une dimension d'image convertie d'au moins 69 300 pixels par image. Dans un autre mode de réalisation exemplaire, le procédé pour obtenir un fichier vidéo en continu consiste à utiliser des données vidéo numériques avec un débit d'image de capture d'au moins 24 images par seconde, et à convertir les données vidéo numériques en fichier vidéo en continu avec un débit d'image convertie d'au moins 24 images par seconde.
EP00944619A 1999-06-03 2000-06-02 Systeme et procede pour obtenir un fichier video numerique de haute qualite Withdrawn EP1188318A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US13729799P 1999-06-03 1999-06-03
US137297P 1999-06-03
US15540499P 1999-09-22 1999-09-22
US155404P 1999-09-22
US16955999P 1999-12-08 1999-12-08
US169559P 1999-12-08
PCT/US2000/015405 WO2000076218A1 (fr) 1999-06-03 2000-06-02 Systeme et procede pour obtenir un fichier video numerique de haute qualite

Publications (1)

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EP1188318A1 true EP1188318A1 (fr) 2002-03-20

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EP00944619A Withdrawn EP1188318A1 (fr) 1999-06-03 2000-06-02 Systeme et procede pour obtenir un fichier video numerique de haute qualite
EP00938126A Withdrawn EP1183870A1 (fr) 1999-06-03 2000-06-02 Systeme et procede de telechargement et de lecture en continu simultanes d'un fichier video numerique haute qualite

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EP00938126A Withdrawn EP1183870A1 (fr) 1999-06-03 2000-06-02 Systeme et procede de telechargement et de lecture en continu simultanes d'un fichier video numerique haute qualite

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EP (2) EP1188318A1 (fr)
JP (2) JP2003501968A (fr)
AU (3) AU5321100A (fr)
WO (3) WO2000076220A1 (fr)

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EP1183870A1 (fr) 2002-03-06
JP2003501968A (ja) 2003-01-14
AU5321000A (en) 2000-12-28
WO2000076219A1 (fr) 2000-12-14
WO2000076220A1 (fr) 2000-12-14
JP2003533066A (ja) 2003-11-05
AU5868900A (en) 2000-12-28
WO2000076218A1 (fr) 2000-12-14
AU5321100A (en) 2000-12-28

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