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IntroductIon

The Comrex LiveShot is a hardware video codec system designed for real-time video and audio

transmission over IP networks, including the Internet. Some of the benefits of the LiveShot system are:

Quality

- LiveShot uses a highly optimized version of H.264 video coding and

AAC-ELD audio coding for the best possible quality.

Delay

- LiveShot’s video and audio processing is highly optimized to reduce delay.

End-to-end delays of 200mS are possible on good networks.

Form Factor

- LiveShot Rackmount is contained in a 1U Rackmount chassis. The

Portable unit can clip to the back of a professional video camera.

Power

- LiveShot Portable uses around 8 watts of power - low enough to share

power with camera batteries.

I/O ports

- LiveShot connects to cameras and switches via a wide array of A/V

connections, including

HD-SDI

, analog

Composite

and

HDMI

ports.

Network connections

- Both LiveShot Rackmount and Portable support Ethernet

and LiveShot Portable supports two simultaneous wireless network connections
over USB.

USB masts

- LiveShot Portable utilizes a pair of innovative bendable USB

goosenecks, providing durability as well as elevation and spacial diversity
between modems.

Interface

- LiveShot is controlled via an intuitive web page delivered from the

internal web server. In the Portable, a built-in Wi-Fi access point can deliver the
page to a laptop with wireless connectivity. Apps are also available to deliver this
page to mobile devices.

Содержание LiveShot Portable

Страница 1: ... portable power details 12 liveshot rackmount connections controls indicators 13 rackmount connector pinout 15 about liveshot video i o 16 ABOUT LIVESHOT VIDEO CODING 18 Bitrate 18 Video Lines 19 Frame Rate 19 ABOUT LIVESHOT AUDIO CODING 19 liveshot encode decode limits 20 About LiveShot Networking and Protocols 21 MORE ABOUT CROSSLOCK 22 III Getting Started with LiveShot Rackmount 25 connecting t...

Страница 2: ... Video 29 V Getting Started with Crosslock 30 VI getting started with liveshot web Interface 32 status section 35 network tab 36 peers tab 37 media link tab 38 config tab 39 VII Network Tab Details 40 locations 41 ethernet settings 42 wlan settings 44 3g 4g settings 44 Dual Modem Support 45 Internal access point 46 advanced network features 46 gateway mode 46 ...

Страница 3: ...acket loss graph 53 Delay slider 54 media link detailed view 55 X config tab details 57 A V ports 58 advanced a v settings 60 connection profiles 61 video streams 63 video advanced options 64 interlaced mode 64 audio streams 67 audio advanced options 69 How Buffer Parameters work 69 about connection profile combos 70 admin settings 70 admin advanced options 71 ...

Страница 4: ...sslock connections without using switchboard 80 About crosslock security 80 Adding switchboard peers manually 80 Permissive Mode 82 making non crosslock connections 83 xii using the liveshot rack front panel interface 85 XIii advanced topics 90 multiple crosslock connections 90 streaming modes 91 RTSP streaming session modes 91 streaming server mode 92 stream ifb to player mode 92 codec and bandwi...

Страница 5: ...tion is warranted by Comrex against defects in material and workmanship for one year from the date of original purchase as verified by the return of the Warranty Registration Card During the warranty period we will repair or at our option replace at no charge a product that proves to be defective provided you obtain return authorization from Comrex and return the product shipping prepaid to Comrex...

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Страница 7: ... LiveShot Portable uses around 8 watts of power low enough to share power with camera batteries I O ports LiveShot connects to cameras and switches via a wide array of A V connections including HD SDI analog Composite and HDMI ports Network connections Both LiveShot Rackmount and Portable support Ethernet and LiveShot Portable supports two simultaneous wireless network connections over USB USB mas...

Страница 8: ...uced without interruption These are only default modes and lots of profiles exist to raise or lower these data rates depending on available networks The default stream fits nicely within the upload path of one or two 4G LTE services On GSM based 3G services or services marketed as 4G but not LTE based like some HSPA networks this speed will sometimes fit on a single modem but may tend to be constr...

Страница 9: ...deo monitor to LiveShot via HDMI or HD SDI on Rackmount Composite on Portable 3 Power up the unit and wait for the Network light on the front of the Portable Status light on Rackmount to glow red This indicates that the units have booted completely If the light subsequently goes out it means they have detected network connectivity 4 Long Press F2 on the Portable hold for 3 seconds If using the Rac...

Страница 10: ...nds to power the device on and off 2 Store Forward Status Indicator For future use 3 Network Status Indicator Shows current network status Red No network found Off Network OK Green CrossLock VPN established Flashing Green Active video stream 4 SD card Compartment For future use 5 Volume Up Down Allows level control of the headset connection used for the cue channel feature 6 Bluetooth On Off For f...

Страница 11: ...he LiveShot to ignore embedded digital audio sources on HD SDI and HDMI ports and encode the analog audio input only Figure 2 LiveShot Portable top panel Figure 2 shows the top panel of LiveShot Portable 1 Audio level indicators Measures audio level of incoming audio Green means good Orange means approaching clipping 2 Remote connector For future use 3 Wired headset connector 4 pole TRRS style con...

Страница 12: ...ly here Requires 15V DC at approximately 1A 5 SDI Loop Output Provides a loop through output for the signal attached to the SDI IN port 6 HDMI In For connection to camera with HDMI outputs This port does not support HDCP copy protection Copy protected sources like DVD or Blu ray players and some cameras will not work here 1080p60 not supported 7 Composite Video In Analog Composite video input is a...

Страница 13: ...dio Pin 3 Balanced Left audio Pin 4 Balanced Right audio Pin 5 Balanced Right audio For unbalanced input connections connect Pins 1 2 and 4 together and apply L R signal to Pins 3 and 5 respectively USB connections Pin alignment to USB standard 1 1 5V DC 2 2 Data 3 3 Data 4 4Ground Wired Headset connector iPhone style pinning Tip Cue audio out L Ring 1 Cue audio out R Ring 2 Ground Sleeve Electret...

Страница 14: ... a camera When a battery is attached and the power supply is also attached LiveShot will accept power from only the power supply while still passing battery power through to a camera if attached The arrangement may be hot switched without affecting active streams LiveShot will not deliver power from its own power supply to the camera nor will it charge the battery or apply power to the battery ter...

Страница 15: ...controls provide an alternate means for some basic functions 3 Send Audio Indicators Measures audio level of incoming audio Green means good Orange means approaching clipping 4 Receive Audio Indicators Measures audio level coming from remote side Green means good Orange means clipping 5 Status Indicator Used to deliver network status info Red Network lost Off Network active Green CrossLock VPN act...

Страница 16: ...video in When stereo AES3 audio is applied to this port the Analog Audio In ports are automatically disabled 7 AES3 Audio Out Digital audio output from incoming stream active simultaneously with all other audio output ports 8 Composite Video In Analog video input to send is applied here 9 HD SDI In Out Send and receive HD SDI video with embedded audio is applied and extracted here respectively 10 ...

Страница 17: ...l level 6dBu clip Pin 1 Ground Pin 2 Balanced Audio Pin 3 Balanced Audio To use unbalanced sources connect Pins 1 and 3 to Ground and connect the audio signal to Pin 2 This is valid for outputs as the output stage can detect an unbalanced connection and adapt AES3 in and out XLR pinning Pin 1 Ground Pin 2 AES3 Data Pin 3 AES3 Data ...

Страница 18: ...nscaled to SD quality and progressive decode modes will be re interlaced It s important to note the distinction between LiveShot s input resolution output resolution and encode decode resolution which are independent and may be different Input resolution is automatically detected and adapted Encode decode resolution is selected in the connection profile chosen via the user interface On LiveShot Ra...

Страница 19: ... at a reduced frame rate the decoder output frame rate will be increased to automatically match that of the native input video Again the exception is the Portable output which will adapt to an SD frame rate The output of the HDMI port on LiveShot Rackmount may also adapt based on the detected resolution of the device connected to it As shown in the diagram LiveShot is capable of processing entirel...

Страница 20: ...s are defined in Profiles that set all the available encoding options Profiles can be user defined from scratch but we have defined several factory profiles that we feel best balance each of these parameters for various users at specific bitrates If you plan to create your own profile it s often easiest to start with one of these copy and rename it and start changing parameters from there Bitrate ...

Страница 21: ...ignificant impact on encoding quality with lower frame rates offering improved quality as defined above Frame rates on LiveShot are defined as a fraction of the native input frame rate As an example if your native input frame rate is 60fps the encoder can be set to 60 full rate 30 1 2 rate 15 1 4 rate etc If your native frame rate is lower these options will scale down Again the factory profiles c...

Страница 22: ...te send and receive in a LiveShot profile should be 15Mbps or less E g if you are running one way video your profile can encode up to 15Mbps If you are running full duplex with a 2Mbps return channel limit your outgoing video encoder to 13Mbps 2 LiveShot can not generally support 1080i encoding in both directions simultane ously If you need 1080i encoding in the outgoing direction encode the retur...

Страница 23: ... Session Mode as a group of protocols used by the LiveShots to establish and translate how the streams work The default Session Mode in LiveShot is called LiveShot Normal Most users don t need to be aware of Session Modes but they can be altered under advanced settings Technically the LiveShot Normal Session Mode is based on the widely used protocol called SIP Session Initialization Protocol commo...

Страница 24: ... do because CrossLock itself uses only a small amount of network bandwidth MORE ABOUT CROSSLOCK Once CrossLock is established it creates a true VPN between LiveShot devices LiveShots have their own private addressing scheme on this VPN Figure 8 As shown in Figure 8 once CrossLock is established between LiveShots media streams are sent using the VPN addressing scheme based on the IPV6 protocol The ...

Страница 25: ...ons Other LiveShots in the fleet have access to this information and use it to establish CrossLock connections between them Figure 9 In this scenario the LiveShot Portable is likely on a private IP address i e behind a NAT router since it s unusual to find temporary wired or wireless links with public addresses As long as the LiveShot Rackmount in the studio is on a public address or has the corre...

Страница 26: ... either end One of the key features of CrossLock is the ability to bond multiple network channels in a single device Typically CrossLock would handle the channel split between two 3G wireless modems on the Portable end of the link Technically CrossLock is capable of bonding its Ethernet Wi Fi or any other active networks The concept is shown in Figure 10 Once CrossLock detects an additional valid ...

Страница 27: ...ger Windows utility which can be found on the CD ROM disc accompanying your new LiveShot codec or downloaded for free from our website www comrex com When using Device Manager LiveShot s IP address information can only be changed during the first five minutes after power up It s a good idea to cycle power on the unit just before you plan to use the Device Manager to change settings After installin...

Страница 28: ...for the various Static address settings It is important that subnet gateway and at least one DNS server address be entered correctly for proper operation on static addresses Once the new IP address is configured cycle power in the LiveShot to be sure the new entries are activated Keying in the address into a web browser will open the LiveShot control page As shown in Figure 11 a basic control inte...

Страница 29: ...ortant to have the video input connected and active before a connection is made Hot swapping video inputs while a stream is active is not supported If you are connecting to the Composite input you have a choice between analog audio input and AES3 digital input If AES3 audio is detected at the AES3 input port the analog inputs are disabled automatically Nominal analog audio input level is 0dBu with...

Страница 30: ...on to find the unit on your LAN An alternative is to log in to the Portable s internal Wi Fi access point as described in the section Getting Started with the LiveShot Web Interface page 32 Because LiveShot Portable is shipped as DHCP by default for Ethernet the Portable should be essentially plug and play with the unit capable of establishing outgoing connections as soon as a valid network is det...

Страница 31: ... an input is attached it is selected automatically and an indicator lights beside the input Multiple simultaneous inputs are not supported It s important to remember that the LiveShot HDMI input does not support copy protection devices like DVD or Blu ray or computers playing protected content will not work on these ports Some cameras inadvertently apply copy protection to their HDMI output ports ...

Страница 32: ...e studio CrossLock VPN can optionally provide for encryption and protection of media streams using 128 bit AES CTR and protection of media streams using HMACSHA1 CrossLock VPN can bond multiple networks e g a pair of wireless modems establishing what appears to the rest of the LiveShot system as a single media source destination CrossLock has the intelligence built in to determine if a network is ...

Страница 33: ...ions In this case connections can be made directly without engaging CrossLock at all See the section on non CrossLock connections to configure LiveShot for this mode In addition to port UDP 9001 for incoming LiveShot must not have certain ports blocked for outbound traffic in order to use the Switchboard server function to locate mating units automatically This usually isn t a problem unless the n...

Страница 34: ...ut it is very useful for controlling the unit while a different network carries the media streams To use the internal access point it must be enabled in the Web interface See section 6 it is enabled when shipped from the factory and the recessed switch on the Portable s rear panel labeled Wi Fi must be set on The internal Wi Fi access point is designed to have lower power than most other networks ...

Страница 35: ...If that fails it will prompt you to enter a new interface port number The system will next attempt to log in using the default password comrex or the last one used If that fails it will prompt you for the correct password Enter password Figure 12 When using the Portable internal access point the address to key into your browser or app is 10 10 10 10 A URL of simply the word comrex works as well ...

Страница 36: ...hen one of these tabs is chosen the area above the tabs fills with the options for that particular section The area below the tabs is reserved for status and remains always visible Due to space constraints on mobile devices the status section is moved to a fifth tab Here is a quick summary of what s on each section Details are given in the Detail section for each tab ...

Страница 37: ...r in the admin settings 2 Switchboard Server Status shows registration state with the Comrex Switchboard server If this does not show registered it could indicate a network issue 3 CrossLock Status shows whether or not a CrossLock connection has been established what the CrossLock destination address of the mating unit is and whether encryption is applied to the CrossLock link The status bar when ...

Страница 38: ...nfigurations are saved in LiveShot For example it s often not necessary to configure any network parameters if 1 You re using Ethernet and DHCP 2 You re using a 3G 4G modem on a US wireless network devices default to US settings 3 You re using any adapter that has previously been installed and configured 4 You re using the Wi Fi adapter on a Wireless LAN that you ve used before If you re doing any...

Страница 39: ... to the CrossLock connection and used for media when a media connection is established over CrossLock More specific directions are provided in the Network Tab Details section Peers Tab Figure 16 shows the Peers tab which offers a list of destinations to connect to Under many circumstances when the user has only a pair of LiveShots there will only be one destination But several entries can be creat...

Страница 40: ...ion information These graphs are available for both the local transmit and local receive paths In addition each network device can be selected on the right side and statistics relevant only to that network are available Also available here is a slide settings for delay limit which is a critical choice for the user to balance delay and quality on poor networks Figure 17 Details are given in the Med...

Страница 41: ...which is used to set all global configuration for the LiveShot Options here are available to define audio and video profiles configure A V hardware ports and set up CrossLock and administration functions Details are in the Config section Figure 18 ...

Страница 42: ...etwork and CrossLock should become enabled Devices can be hot plugged into the LiveShot s USB ports and if supported will appear in the network tab list as shown in Figure 19 Figure 19 New USB modems except the provided Wi Fi modem should always be attached and tested on a computer before attaching them to LiveShot Often initial provision is only supported by the carrier when used with their custo...

Страница 43: ...e same network interface and switched easily when LiveShot is moved between networks Examples are Ethernet networks that require specific static settings that are used variably in conjunction with DHCP based Ethernet networks or Wi Fi networks that are mixed and matched regularly As shown in Figure 20 each network has a factory configured Location called Default and more can be created Figure 20 ...

Страница 44: ...quick reversion to DHCP where necessary Figure 21 shows the creation of a new Ethernet Location Once the default setting of DHCP is set to Static new entries will appear to allow setting of all the vital static Ethernet fields These include IP address Gateway Address and DNS entries All these entries are required Give your location a descriptive name e g West Coast Studio to help you remember it F...

Страница 45: ...o remember that if you choose a new active Location and are configuring LiveShot via that network you will lose web connectivity when the new Location is chosen Figure 22 It is always recommended that LiveShot be manually rebooted whenever the Ethernet settings have been changed ...

Страница 46: ... band and will list all networks found in the 2 4 and 5 8 GHz Wi Fi band Networks with hidden IDs can be entered manually Once a network is chosen the security requirements of that network will be detected LiveShot supports networks with WEP WPA WPA2 and WPA Enterprise 802 11x security requirements Entries will be offered for user and or passcodes for the detected network security 3G 4G Settings S...

Страница 47: ...ng field and changing that Dual Modem Support When more than one Network Device is enabled and active on LiveShot Portable regardless of whether it s wired or wireless Wi Fi or 3G 4G the system will attempt to connect its CrossLock VPN link over both devices simultaneously Any connections made between LiveShots will be load balanced with active media flowing both ways on all connections This allow...

Страница 48: ...ows you to share one network with another While technically it can be applied to any network it s most valuable when applied to the portable s internal access point When Gateway mode is enabled here and a different network interface on LiveShot has Internet connectivity that connectivity will be bridged to any user attached to the access point This means that using a phone tablet or laptop you can...

Страница 49: ... from the control buttons on the LiveShot hardware Factory reset erases all internal settings that contain user profiles and destinations and all network information In some environments e g Ethernet connections with static addresses it s an advantage to not have your network lose all its settings on a factory reset By choosing the advanced option Preserve after Reset and setting it to Yes you can...

Страница 50: ...motely You might want to attach a LiveShot to Ethernet so you can view statistics generated by the device but use only the wireless network s for media Any network present on the LiveShot can be told not to participate in CrossLock connections through the advanced menu item Use with CrossLock Setting this to no sets this network to be used only for control functions Broadcast Config This setting a...

Страница 51: ...own in Figure 26 Figure 26 1 Descriptive Name The name you ve assigned to this outgoing connection so you can remember it e g traffic cam 7 2 State The current state of the connection e g Disconnected Connected Negotiating 3 Last state A record of the last status message displayed 4 Session Mode Transport layer used by this connection usually LiveShot Normal see section on Session modes in the Con...

Страница 52: ...he return direction assuming the rack has a video input applied it will attempt a lower grade 256Kbps confidence feed with two channel audio 2 Cue This peer is designed to be connected simultaneously with the main media peer and to the same location It creates a low quality telephone bandwidth audio channel routed to the headset jack on the portable and the cue audio ports on the rack It must also...

Страница 53: ... a Switchboard client a list will be offered here of all other LiveShots contained in your Switchboard contact list Much more information about Switchboard is given in the Switchboard section If you are planning on making a connection without the use of CrossLock so therefore without Switchboard you will have to choose Manual Destination here Details on this function are in the section called Maki...

Страница 54: ...ntrols necessary for the user while a media stream is active It contains a wealth of information about network performance in each direction All graphical data in the Media Link tab is updated once every second The main Media Link graph is shown in Figure 28 and contains two main displays Figure 28 ...

Страница 55: ... chosen in the profile used in the connection This is treated as a maximum value so utilization should mostly remain below this line Because these values are averaged there may be moments where the utilization moves above the target line momentarily 2 Throttle rate When CrossLock throttling is enabled the default state this line indicates how much throttling will be applied You will see utilizatio...

Страница 56: ...g addressed In either Auto or Manual mode a series of color bars are overlayed on the slider to signify delay zones of safety Furthest left is the red zone which indicates a buffer level that is too low for stable transmission The yellow zone indicates a delay buffer that may have stability issues and the green zone indicates a buffer level that should provide stability These zones scale increase ...

Страница 57: ... particular network This is shown in Figure 31 R1 R3 Figure 31 The series of these three screenshots identifies a working cellular connection with two modems Both are performing but one is doing far better The green bars in R1 show the amount of successfully re sent packets from a combined network connection To drill down for each network click on the button for that network R2 displays the top mo...

Страница 58: ...t rate Green 3 The Packet Loss graph middle shows only truly lost packets as opposed to late and recovered 4 A third graph is added to indicate an approximate one way delay figure calculated for this interface The Detailed View is most useful when more than one network is being used by LiveShot as it allows comparison of the quality and delay figures of the various networks As with the overview gr...

Страница 59: ...tab details As shown in Figure 32 the Config tab has three main options 1 A V ports 2 Connection Profiles 3 Admin Settings Each of these sections is a complex topic and is treated in its own section below Figure 32 ...

Страница 60: ...8 A V Ports Figure 33 shows the LiveShot A V Ports page Each of the available inputs can be clicked to open a configuration page Figure 33 The Composite Input config page is shown in Figure 34 Figure 34 ...

Страница 61: ...re supported In the case of HDMI the permitted output formats are read from the downstream HDMI device In the case of composite the outputs are limited to 480 576i If one of these outputs is active and the input video format is not supported the format will be rescaled to the nearest one supported by the output e g a connection with an input format of 1080i at the encoder will be rescaled to 480i ...

Страница 62: ...etected on the port 2 Audio Input This option allows for use of the analog audio inputs in conjunction with digital video inputs Auto setting default will assume the audio input is the default for the video HDMI embedded HDMI HD SDI Embedded HD SDI Composite Analog in If this setting is changed then any embedded digital audio at the selected video inputs HD SDI or HDMI will be ignored and the chos...

Страница 63: ...ver having to create or edit a profile Figure 35 Factory profiles are named by the approximate network bandwidth required along with whether they are one way duplex or asymmetrical different options in each direction The profiles provided have audio and video settings determined to be a good choice for the chosen network capacity Factory profiles cannot be edited For changes it s best to click the...

Страница 64: ...ection one is desired In the case that the stream has the same parameters in both directions a single stream can be defined as bidirectional and only one entry is required As an example if you wish to build a profile with high quality video and audio in one direction but lower quality video and high quality audio in the other you could build three streams 1 One for the outgoing high quality video ...

Страница 65: ...encoded at the same rate as the input Half rate The video will be encoded at half the frame rate of the input e g 50 Hz input 25Hz encode rate Other fractions of the native input frame rate are available As an example if the input video frame rate is 24fps 1 2 rate will be 12fps etc Bit Rate In bits per second the target encoding rate desired 256000 10000000 Figure 37 Special note When the CrossLo...

Страница 66: ...ption should be left on If you are applying interlaced video to the LiveShot encoder and not utilizing the CrossLock function e g on a managed WAN the way to avoid unnecessary conversions from interlaced to progressive is to set the Deinterlacer option to disabled Interlaced Mode When the encoding interlaced video interlaced video applied to LiveShot and Deinterlacer set to disabled this option de...

Страница 67: ...a flow more constant Factory pro files with the burst constrained label use IR mode Only Available at Full Frame Rate Intra Refresh mode has the following disadvantages 1 Rolling Bar Especially pronounced at lower data rates IR mode can introduce an artifact of a refresh bar scrolling from top to bottom of the video The bar tends to be more pronounced based on how hard the encoder is working e g h...

Страница 68: ...h detail but increases delay because a buffer must be added to the process Default is not to use B frames but if your video quality is critical and delay is not a concern adding one two or three B frame sequences to the encoder can improve the image Keyframe Interval In H 264 video coding reference frames are sent periodically to reset the predictions made by the encoder algorithm This results in ...

Страница 69: ...AAC ELD removes the need to delay video in order to maintain A V sync 2 Spectral Band Replication SBR This is a technique used to reduce network bitrate by applying synthesis algorithms to high frequencies The AAC variant that utilizes SBR without the low delay aspect is known as HE AAC Each of these options of AAC LD and SBR can be enabled and disabled in your audio stream This may be important f...

Страница 70: ... Only outgoing from this LiveShot or Receive Only incoming to this LiveShot Channels Choices are mono or stereo Low Delay Chooses a low audio coding frame size lessening delay Audio SBR Adds spectral band replication to reduce bitrate Bit Rate The overall network utilization that should be reserved for audio Set in bits second For guidelines ordinary AAC and AAC LD works best above 64kb s per chan...

Страница 71: ...c it will automatically increase and decrease delay based on several factors measured on the network within the limits that are set by the system The adjustments listed here change the default limits within which the Manager can do its job When adjusting the buffer manager within a stream it s important to remember these changes will affect how the decoder in that direction will work E g if a tran...

Страница 72: ...timized for Wi Fi and another with a profile optimized for 4G Admin Settings The third option in the Config Tab lets you define some global parameters for LiveShot operation 1 The Web Server port allows you to change the port used to deliver web control interface Note that if you change this from the default port 80 you will need to add a port number to your URL in order to access these pages e g ...

Страница 73: ...left at their default settings disabled 81 The System Watchdog should normally be enabled but may be disabled during troubleshooting by Comrex support Advanced Config Options Choosing Advanced Options in the Config Tab options several new options Auto Connect The first Advanced mode under the Config Tab are the Auto Connect options This allows you to designate which of your defined connections are...

Страница 74: ... on 1 and a cue channel connection to the same destination unit is on 2 3 is tied to an HD video connection entry 4 in the peer list and a Loopback test connection is active on 4 Before you use hotkeys 1 3 you must define a destination for each of these entries in the peer list See Making LiveShot Connections for more on this You can change each of these hotkey settings to any peer you have define...

Страница 75: ... labeled LiveShot Normal SIP is the one used on most LiveShot to LiveShot connections Under the hood it s based on the SIP protocol borrowed from the Voice over IP industry This protocol is very complex with many options most of which don t apply to average LiveShot connections One aspect of the SIP protocol that is not utilized normally in LiveShot is the ability to register with external SIP ser...

Страница 76: ...change this setting to No to turn this restriction off This special setting must be changed on both LiveShots in the link See Figure 41 Figure 41 System Clock LiveShot uses a network reference to sync its clock The clock function is used internally and will be useful in future upgrades You can change the default time NTP server used by liveShot here LiveShot normally uses UTC as its time reference...

Страница 77: ...fields required to add a peer are shown in Figure 42 Figure 42 You should provide the name of the LiveShot unit in the name field and the unit ID Ethernet MAC address in the next field Under Allowed choose always to be sure connections are allowed regardless of Switchboard accounts Finally enter the public IP address of the new peer if outgoing connections are desired Both sides need to add their ...

Страница 78: ...need to change the default incoming port It can be changed here If this port is changed and Switchboard is used to establish connections no further changes are required In the case of connections without Switchboard the port change will need to be noted in the outgoing address on the calling unit Encryption Protection LiveShot has the ability to prevent interception of streams Encryption and alter...

Страница 79: ...default compresses some of these headers to conserve network bandwidth In instances where the network rejects this or packet inspection is required this compression can be disabled Encoder Throttle When CrossLock is used the system has the capability of instructing the encoder to reduce bitrate when network conditions are challenging This can result in reduced frame rate and or resolution In insta...

Страница 80: ...the Peers Tab section or you can edit the default Peers presented in the factory configuration If you are using Switchboard this process is simple As shown in Figure 43 choosing the Remote Unit option in the Peer Edit menu will present a list of all other LiveShots in that unit s contact list Choose the target LiveShot here Figure 43 If you are not using Switchboard special setup is required to au...

Страница 81: ...associated with the incoming connection All encode options are defined by the outgoing profile so no parameters may be adjusted for incoming connections Media can be halted by selecting the Disconnect option on either end of the link Making Connections via Hotkeys The LiveShot Hotkeys F1 and F2 on portable Connect menu options on Rack may be used to make easy one press connections The first entry ...

Страница 82: ...fault Switchboard Peer List is downloaded from the Switchboard Server and contains only those LiveShots that are in the unit s Contact List this may be by default all LiveShots in the account or may be edited to be a subset It will also contain any LiveShots added via the Switchboard Shares function Unless you take special steps only these LiveShots can connect to you and vice versa You may need t...

Страница 83: ...tgoing connections to the new peer you ll need to add the public IP address of the peer Figure 44 Once these entries are done and saved CrossLock connections are possible When a new outgoing connection is being created for the first time see section on Making Outgoing Connections the manual peer will appear in the list of places to connect Remember the same process must take place in the opposite ...

Страница 84: ...an make these connections but Permissive Mode opens LiveShot to all other LiveShots The Permissive mode setting is under the Config Tab Advanced CrossLock VPN Permissive On Before changing this setting make sure you understand the implications described in About CrossLock Security above Also note that this change affects only the local LiveShot The respective LiveShot in the link must also grant p...

Страница 85: ...ake or receive connections without CrossLock applied Enabling connections without CrossLock is done in the Config tab under Adavanced Settings Session Modes LiveShot Normal SIP entry The last option is Allow CrossLock Only and if set to no allows LiveShot to receive connections using the SIP protocol but without the CrossLock layer If non CrossLock connections are desired between two LiveShots thi...

Страница 86: ...Figure 47 Under the Remote Unit choice where you ll normally see your list of Switchboard peers you ll choose Manual Destination This choice will enable another field labeled Destination Here you will enter the public IP address of the unit you want to connect to Once this is set up connection and disconnection of non CrossLock peers happens in the normal way ...

Страница 87: ...ations programmed into the LiveShot Adjust settings in the LiveShot s A V I O ports Restart LiveShot and reset it to factory defaults Check connection status send and receive audio levels and video input specifications The Interface does not allow these operations Create or edit new profiles or connection information Edit or assign the Hot key auto connections Configure or enable CrossLock VPN mod...

Страница 88: ...86 Figure 48 and Figure 49 show a map of the various menu options on the Rackmount front panel interface Figure 48 ...

Страница 89: ...section page 32 for more on these options Navigation is done through the arrow buttons and enter keys To the farthest most side of the top line cursor icons appear to offer which cursors are active Most menus are browsed using the and buttons The last option in each list will return to the previous menu ...

Страница 90: ...elected with the and buttons Scrolling all the way to the right on a numeric entry will offer an option to cancel your setting The legend on the right side of the bottom line of the display gives hints as to whether This item is purely informational and non editable This item takes you to a submenu The Enter key will execute the chosen command The current value can be edited by pressing Enter ...

Страница 91: ...89 The current value can be saved by pressing Enter The current operation can be cancelled by pressing Enter ...

Страница 92: ...rst it s important to disable the LiveShot s Encoder throttle function to avoid one poor link from reducing quality for the others This is done in the Config tab under Advanced CossLock VPN Encoder Throttle No on the end that will be delivering the multiple streams Since this setting is universal for all connections it should be set back to yes when using single LiveShot connections for best resul...

Страница 93: ...ns The same is true for Cue connections They can be established and maintained to several LiveShots simultaneously but only one can be configured for duplex communication Streaming Modes RTSP Streaming Session Modes In current firmware the use of RTSP Streaming Session modes should be considered experimental Comrex may not be able to support all use cases for these modes The RTSP Session modes pro...

Страница 94: ...ode provides an RTSP stream in very much the same way as Streaming Server mode but the source of the stream is the media being received over a LiveShot Normal connection Using this mode the incoming media is decoded normally by LiveShot but is also provided to the RTSP Streaming server for delivery to players The main application of this mode is that return media can be viewed on mobile devices th...

Страница 95: ...ith any LiveShot normal connection present This may require a network connection many times the size of a typical LiveShot network Secondly mobile players used in either mode have definite limitations to their processing power Streams to be played on mobile devices should have relatively low bitrates assigned below 1Mbs is often required Again this will affect the bitrate of the LiveShot normal co...

Страница 96: ...rograms are licensed under the Gnu Public License GPL ver 2 For more information on GPL see http www gnu org As per the GPL source code for this software is available on request from Comrex on CD ROM or other electronic format To obtain this software please contact our support department at 1 978 784 1776 We retain the right to charge a small handling fee for distribution of this software The foll...

Страница 97: ... Veillard All Rights Reserved All Programs listed under the MIT license are subject to the following provisions Permission is hereby granted free of charge to any person obtaining a copy of this software and associated documentation files the Software to deal in the Software without restriction including without limitation the rights to use copy modify merge publish distribute sublicense and or se...

Страница 98: ...tware Permission is granted to anyone to use this software for any purpose including commercial applications and to alter it and redistribute it freely subject to the following restrictions 1 The origin of this software must not be misrepresented you must not claim that you wrote the original software If you use this software in a product an acknowledgment in the product documentation would be app...

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