This documentation is for reference only. We are no longer onboarding new customers to Programmable Video. Existing customers can continue to use the product until December 5, 2026.
We recommend migrating your application to the API provided by our preferred video partner, Zoom. We've prepared this migration guide to assist you in minimizing any service disruption.
This guide provides advice for developing high-quality Twilio Video applications. For an optimal end-user experience, we highly recommend that you read the complete Twilio Programmable Video documentation and tailor our general recommendations provided here to your specific use-case.
Use this table as a fast guide to find the recommended settings for your application.
Choosing the column
Choosing the row
grid
,
collaboration
or
presentation
) use
this section
. If in doubt, use
collaboration
.
Desktop Browser | Mobile Browser | Mobile SDK | |
---|---|---|---|
P2P Room | Recommended Settings | Recommended Settings | Recommended Settings |
Group Room (grid ) | Recommended Settings | Recommended Settings | Recommended Settings |
Group Room (collaboration ) | Recommended Settings | Recommended Settings | Recommended Settings |
Group Room (presentation ) | Recommended Settings | Recommended Settings | Recommended Settings |
Quality is an elusive concept that may have different meanings in different contexts. With Twilio Programmable Video, quality is a synonym of Quality of Experience understood as to how well a video application solves to end-users' needs and addresses their expectations.
Videoconferencing is the most typical use-case of real-time video applications. They allow end-users to communicate "as they do face-to-face." Hence, end-users expectations are high fidelity (i.e. high resolution, high frame-rate, etc) and low latency (i.e. real-time conversational interactions). However, the quality of experience may also be impacted by other aspects such as battery consumption, availability of computing and networking resources, etc. Some of the variables affecting quality inversely impact one another. For example, if you increase the video resolution then the battery consumption and the networking costs will also increase.
Hence, before starting developing a high-quality video application, first you must wonder: what do end-users need and expect? Having a precise answer to that question will help you make the most appropriate decisions for quality optimization.
You may find useful the following concepts and definitions:
Resolution
Video tracks can be understood as sequences of still images each of which is encoded as a matrix of pixels. The resolution refers to the dimensions of such a matrix expressed as width x height. The following resolutions are common:
Resolution | Dimensions (pixels) |
---|---|
FullHD (Full High Definition) - aka 1080p | 1920x1080 [1] |
HD (High Definition) - aka 720p | 1280x720 |
qHD (Quarter High Definition) - aka 540p | 960x540 [1] |
VGA (Video Graphics Array) | 640x480 |
QCIF (Quarter Common Interface Format) | 176×144 |
Frame-rate
The frame-rate refers to the number of still images that the video stream includes per time unit. It is typically expressed in terms of fps (frames per second). Hence, an HD@30fps video will comprise a sequence of 30 HD still images per second.
Bitrate
The bitrate refers to the number of bits that a given video or audio stream consumes when being transported through a digital network. It is typically measured in terms of bps (bits per second) sometimes prefixed with a power of 10 prefix (e.g. Kbps, Mbps, etc).
P2P and Group Rooms
P2P and Group Rooms and the two main building blocks of Twilio Programmable Video APIs. Please, read our Understanding Video Rooms guide for further guidance.
Codecs: VP8, H.264, and VP8 Simulcast
A codec refers to a type of algorithm that encodes a video signal typically compressing it in the process. VP8 and H.264 are the two main codecs used for videoconferencing. VP8 Simulcast is a scalable version of the VP8 codec. For further information, you may read our Managing Codecs and Working with VP8 Simulcast developer guides.
Network Bandwidth Profile API
The Network Bandwidth Profile API (aka BW Profile API) is a Twilio Video API specifically designed for optimizing bandwidth utilization in Group Rooms. This is a critical API for creating high-quality Group Room applications.
Track Priority API
The Track Priority API allows developers to set the relative priority of Tracks in a video application. The Network Bandwidth Profile API uses Track priorities to assign bandwidth to tracks.
Dominant Speaker Detection API
The Dominant Speaker is the participant having the highest audio activity at a given time. Many videoconferencing applications enhance the Dominant Speaker (e.g. by representing it larger in the central area of the UI). Twilio's Dominant Speaker Detection API makes it possible for developers to be notified when the Dominant Speaker changes in a Group Room. Refer to our Detecting the Dominant Speaker developers guide for further guidance.
Network Quality API
The Network Quality API is a Video API specifically designed for monitoring the network quality on Group Rooms. Refer to Using the Network Quality API developer guide for further information.
Video Bitrates
The bandwidth requirement of video streams will depend on the codec, resolution and frame rate. The following table describes the minimum bandwidth required for various codecs and resolutions. In all cases the frame rate is assumed to be 30 fps.
Video Codec | Resolution (width x height) | Bitrate (kbps) |
---|---|---|
VP8 | 176x144 | 150 |
VP8 | 640x480 | 400 |
VP8 | 1280x720 | 650 |
VP8 | 1920x1080 [1] | 1,200 |
VP8 Simulcast | 176x144 | 150 |
VP8 Simulcast | 640x480 | 550 |
VP8 Simulcast | 1280x720 | 1,400 |
VP8 Simulcast | 1920x1080 | 3,000 |
H.264 [2] | 176x144 | 125 |
H.264 [2] | 640x480 | 400 |
H.264 [2] | 1280x720 | 600 |
Screen Share Bitrates
Screen share typically uses a frame rate of 5 fps. The following table describes the minimum bandwidth required for various codecs and resolutions. In all cases the frame rate is assumed to be 5 fps.
Video Codec | Resolution (width x height) | Bitrate (kbps) |
---|---|---|
VP8 | 1280x720 | 85 |
VP8 | 1920x1080 [1] | 175 |
VP8 Simulcast | 1280x720 | 700 |
VP8 Simulcast | 1920x1080 | 1,800 |
H.264 [2] | 1280x720 | 90 |
[1]: Note that on some devices, frame dimensions may differ slightly due to limitations of some hardware video encoders requiring the dimensions to be a multiple of 16. For example, 960x540 may actually be 960x528.
[2]: Note that each device or browser has a different H.264 codec implementation and as such there will be some variance to the bitrates presented above.
Audio Bitrates
The default bitrate for the Opus codec is 32 kbps.
Before going deep into the technical details, it may be interesting to understand some general common-sense recommendations that you may find useful in your design process.
Subscribe only to what end-users need
Encoding, communicating and rendering video tracks is expensive. This is very noticeable in multiparty applications when the number of participants is large. For example, in a room with 20 participants, it is generally a bad idea to have all the participants rendering 20 high resolution video tracks. That could contribute to network congestion and will overload the client CPU resources making the quality of experience unacceptable. Instead, well-designed videoconferencing services tend to limit the number of rendered video tracks to the ones that are really required. For example, in an e-learning application, it doesn't provide much value having all the students rendering the video of the rest of the students all the time. It is more reasonable to do it only in special situations such as when a question is being asked by that specific participant. In that case, developers must make use of the Network Bandwidth Profile API, which dynamically adjusts to the dominant speaker and rendered size of the participants who are displayed on screen. In addition, the Network Bandwdith Profile API can automatically switch off video tracks that are not visible on screen.
Make it simple for end-users to mute
Your application should provide mute capabilities to end-users so that they can disable the video or audio communication as they wish. This will avoid unnecessary traffic and background noise.
Use VP8 Simulcast in multiparty Group Rooms
Multiparty Group Rooms participants should prefer VP8 Simulcast over other video codecs. The larger the number of participants in a room, the more important Simulcast is for providing the best possible quality of experience.
Use a reasonable resolution and frame-rate
Frame-rate and resolution are the two main capture constraints that affect video fidelity. When the video source is a camera showing people or moving objects, typically the perceptual quality is better at higher frame-rate. However, for screen-sharing, the resolution is typically more relevant. You should try to set resolution and frame-rate to the minimum value required by your use-case. Over-dimensioning resolution and frame-rate will have a negative impact on the CPU and network consumption and may increase latency. In addition, remember that the resolution and frame-rate you specify as capture constraints are just hints for the client video engine. The actual resolution and frame-rate may decrease if CPU overuse is detected or if the network capacity is not enough for the required traffic.
Consider the render dimensions
When setting your video capture constraints for publishers you must also wonder about the render size on the subscriber's side. If you know that a given video track is to be rendered only in thumbnail size for all subscribers, then it does not make sense to capture it in high resolution at the publisher.
Do not share resources
High-resolution video and audio consume relevant CPU and bandwidth resources. If those resources are being shared with other applications the quality of experience will decrease. To have the best possible experience, you should recommend your end-users to close all the applications that may steal CPU or bandwidth to your video service while it's executing.
Use the best connectivity you can find
Network connectivity is the most critical aspect affecting communication quality. Restricted bandwidth, high latency, and packet loss may affect very negatively your end-users' experience. Hence, you should recommend using the best possible network access they may find: wired connectivity is commonly better than a wireless connection. Among wireless connections, typically corporate or cellular connectivity is better than public open shared WiFi networks.
Using maxVideoBitrate
or maxAudioBitrate
Both parameters allow controlling the maximum Participant's upstream bandwidth.
maxVideoBitrate
specifies the maximum video bitrate a participant can publish to the Room. By default, no value is set and the
maxVideoBitrate
is unlimited. In that case, the bitrate is only limited by the Twilio client SDK using an algorithm that considers the available bandwidth and CPU resources. In general, we recommend trusting that algorithm and avoid setting the
maxVideoBitrate
. However, in devices with restricted CPU or battery life we recommend setting
maxVideoBitrate
to a value between 500000 and 2000000 bps per track. Note, if a Participant is Publishing
N
video tracks then each video track will be limited to consuming
maxVideoBitrate/N
.
maxAudioBitrate
specifies the maximum audio bitrate published by a Participant. It only takes effect when using Opus (i.e. it has no effect on PCM codecs). By default it is unset and Opus is configured with its default settings consuming between 20Kbps and 40Kbps. Twilio's recommendation is to keep the default. However, when the audio is human speech, we may restrict
maxAudioBitrate
to 16Kbps to save bandwidth without any significant quality degradation. Do not restrict
maxAudioBitrate
if you intent to communicate music or other type of audio signal beyond human speech.
Recommendation | When to use it | |
---|---|---|
maxVideoBitrate | Keep default (unset) | In mobile platforms keep it between 500000 and 2000000 bps per video track |
maxAudioBitrate | Keep default (unset) | In speech communications keep it over 16000 bps per audio track |
Use GLL
On the Internet, latency and packet loss depend on geolocation. When the connection between a sender and a receiver spans the globe, latency and jitter are increased by the distance between the parties. Packet loss is also more likely, due to the number of routers in the connection path. Due to this, the Twilio infrastructure that serves your rooms should be as close as possible to your clients. Otherwise, quality may be affected:
To minimize these problems, Twilio makes it possible to specify the signaling and media regions for your Rooms. However, determining what's the closest region for a participant is not always trivial. For this reason, we recommend developers use GLL (Global Low Latency). When GLL is specified, Twilio will automatically choose the region that minimizes latency. See our Video Regions and Global Low Latency documentation for further insight.
Measure
Quality should be understood as a process. You should try to measure both your end-users' perception as well as the many different factors that may affect it including CPU consumption and network connectivity metrics. You may find Twilio's Network Quality API interesting for the latter. With that information, try to understand your end-users' pain points and design a strategy to minimize them. Periodically repeating the measure-analyze-implement cycle is the best way to guarantee you are offering the best possible quality of experience to your users.
Selecting the most appropriate Room Type for your use-case is a critical step. For that, we strongly recommend following our Understanding Twilio Video Rooms Developers Guide. From the quality perspective, and without any consideration to features or compliance, the difference between P2P and Group Rooms can be synthesized in the following table:
P2P Rooms | Group Rooms | |
---|---|---|
Media connections | Client-to-client communication | Server-routed communication |
Upstream bandwidth | Proportional to the number of participants | Constant with the number of participants |
You may find the following rules of thumb useful to assess the suitability of P2P Rooms for your use-case:
Using the appropriate client-side settings is essential for optimizing P2P Room quality. The following recommendations may be useful for that purpose.
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name',3audio: true,4maxAudioBitrate: 16000, //For music remove this line5video: { height: 720, frameRate: 24, width: 1280 }6});
Codec Settings
Setting | Recommended value |
---|---|
Video codec | -Use VP8 (default)-H.264: only if needed for interoperability reasons-Never use Simulcast |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use HD@24fps-Consider VGA@30fps you detect CPU overuse |
For screen | -Use FullHD@15fps-Consider HD@15fps if you detect CPU overuse |
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name',3audio: true,4maxAudioBitrate: 16000, //For music remove this line5video: { height: 480, frameRate: 24, width: 640 }6});
Codec Settings
Setting | Recommended value |
---|---|
Video codec | -Use VP8 (default)-H.264: only if needed for interoperability reasons-Never use Simulcast |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use VGA@24fps-Consider HD@24fps if codec has HW support |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support |
Show me the code
Android SDK
1VideoConstraints videoConstraints =2new VideoConstraints.Builder()3.maxFps(24)4.maxVideoDimensions(VideoDimensions.VGA_VIDEO_DIMENSIONS)5.build();67LocalVideoTrack localVideoTrack = LocalVideoTrack.create(context, true, videoCapturer, videoConstraints);89ConnectOptions connectOptions = new ConnectOptions.Builder(accessToken)10.videoTracks(Collections.singletonList(localVideoTrack)11.encodingParameters(new EncodingParameters(16, 0)12.build();
iOS SDK
1let format = VideoFormat()2format.dimensions = CMVideoDimensions(width:640, height: 480)3format.frameRate = 2445camera.startCapture(device: device, format: format, completion: { (captureDevice, videoFormat, error) in6// Any code needed to run after capture starts7});89localVideoTrack = LocalVideoTrack(source: camera, enabled: true, name: "Camera")1011let connectOptions = ConnectOptions(token: accessToken) { builder in12if let localVideoTrack = localVideoTrack {13builder.videoTracks = [localVideoTrack]14}15builder.encodingParameters = EncodingParameters(audioBitrate:16, videoBitrate:0)16}
Codec Settings
Setting | Recommended value |
---|---|
Video codec | -Use VP8 (default)-H.264: only if needed for interoperability reasons-Never use Simulcast |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use VGA@24fps-Consider HD@24fps if codec has HW support. |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support. |
Group Room quality strongly depends on how the bandwidth is managed. To optimize quality, you must make sure that your video tracks are appropriately prioritized and that bandwidth is allocated in alignment with your use-case needs. This is done using the Track Priority API and the Network Bandwidth Profile API.
Track priorities are used to determine the importance of tracks. They are used to allocate bandwidth and to decide which tracks should be switched off in case of congestion. Track priorities are use-case dependent and setting them correctly is essential for having optimal quality. The following general guidelines may be helpful for that objective:
Audio track priorities
Video track priorities
high
priority so that in the case of network congestion this video track will be the last to be switched off
high
. When screen-sharing, the screen should be the
high
priority track. If screen-share is absent, and Dominant Speaker Detection is activated, the dominant speaker video may be the
high
priority track.
dominantSpeakerPriority
may need to go from
high
to
low
when a screen-share is activated.
Determining the Bandwidth Profile Mode
Bandwidth Profiles have three modes: collaboration
, presentation
, and grid
. You can determine the mode that best fits your use-case with the following decision diagram:
Do I use Group Rooms?
Is it a multiparty service?
Is there a main video track?
Can I use VP8 Simulcast?
Is the main track quality critical?
Applications use grid mode for one of the following reasons:
grid
mode.
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name'3audio: true,4video: { height: 720, frameRate: 24, width: 1280 },5bandwidthProfile: {6video: {7mode: 'grid'8}9},10maxAudioBitrate: 16000, //For music remove this line11//For multiparty rooms (participants>=3) uncomment the line below12//preferredVideoCodecs: [{ codec: 'VP8', simulcast: true }],13networkQuality: {local:1, remote: 1}14});
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use VP8 (default)-H.264: only if needed for interoperability reasons-Never use Simulcast |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-Use VP8 if simulcast is not supported-H.264: only if needed for interoperability reasons |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use HD@24fps-Consider VGA@24fps if room is multiparty or if you detect CPU overuse |
For screen | -Use FullHD@15fps-Consider HD@15fps if room is multiparty or if you detect CPU overuse |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Keep default (grid ) |
trackSwitchOffMode | -Keep default (predicted ) |
maxSubscriptionBitrate | -Keep default (unlimited) |
dominantSpeakerPriority | -Keep default (standard ) |
clientTrackSwitchOffControl | -Keep default (auto ) |
contentPreferencesMode | -Keep default (auto ) |
Track Priority Settings
Setting | Recommended value |
---|---|
webcam | -Keep default (standard ) |
screen | -Keep default (standard ) |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Inactive |
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name'3audio: true,4video: { height: 480, frameRate: 24, width: 640 },5bandwidthProfile: {6video: {7mode: 'grid',8maxSubscriptionBitrate: 25000009}10},11maxAudioBitrate: 16000, //For music remove this line12//For multiparty rooms (participants>=3) uncomment the line below13//preferredVideoCodecs: [{ codec: 'VP8', simulcast: true }],14networkQuality: {local:1, remote: 1}15});
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use VP8 (default)-H.264: only if needed for interoperability reasons-Never use Simulcast |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-Use VP8 if simulcast is not supported-H.264: only if needed for interoperability reasons |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use VGA@24fps-Consider HD@24fps if codec has HW support |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Keep default (grid ) |
trackSwitchOffMode | -Keep default (predicted ) |
maxSubscriptionBitrate | -Keep it under 2500000 |
dominantSpeakerPriority | -Keep default (standard ) |
clientTrackSwitchOffControl | -Keep default (auto ) |
contentPreferencesMode | -Keep default (auto ) |
Track Priority Settings
Setting | Recommended value |
---|---|
webcam | -Keep default (standard ) |
screen | -Keep default (standard ) |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Inactive |
Show me the code
Android SDK
1VideoConstraints videoConstraints =2new VideoConstraints.Builder()3.maxFps(24)4.maxVideoDimensions(VideoDimensions.VGA_VIDEO_DIMENSIONS)5.build();67LocalVideoTrack localVideoTrack = LocalVideoTrack.create(context, true, videoCapturer, videoConstraints);89// Enable network quality information for local and remote participants10NetworkQualityConfiguration configuration =11new NetworkQualityConfiguration(12NetworkQualityVerbosity.NETWORK_QUALITY_VERBOSITY_MINIMAL,13NetworkQualityVerbosity.NETWORK_QUALITY_VERBOSITY_MINIMAL);1415// Enable recommended Grid mode Bandwidth Profile Options16VideoBandwidthProfileOptions videoBandwidthProfileOptions = new VideoBandwidthProfileOptions.Builder()17.mode(BandwidthProfileMode.GRID)18.build();19BandwidthProfileOptions bandwidthProfileOptions = new BandwidthProfileOptions(videoBandwidthProfileOptions);2021ConnectOptions connectOptions = new ConnectOptions.Builder(accessToken)22.enableNetworkQuality(true)23.networkQualityConfiguration(configuration)24.videoTracks(Collections.singletonList(localVideoTrack)25.bandwidthProfile(bandwidthProfileOptions)26.encodingParameters(new EncodingParameters(16, 0) // Remove if streaming music27/*28* Enable simulcast for Rooms with more than 2 participants29* preferVideoCodecs(Collections.singletonList(new Vp8Codec(true)));30*/31.build();
iOS SDK
1let format = VideoFormat()2format.dimensions = CMVideoDimensions(width:640, height: 480)3format.frameRate = 2445camera.startCapture(device: device, format: format, completion: { (captureDevice, videoFormat, error) in6// Any code needed to run after capture starts7});89localVideoTrack = LocalVideoTrack(source: camera, enabled: true, name: "Camera")1011let connectOptions = ConnectOptions(token: accessToken) { builder in12if let localVideoTrack = localVideoTrack {13builder.videoTracks = [localVideoTrack]14}15builder.isNetworkQualityEnabled = true16builder.networkQualityConfiguration =17NetworkQualityConfiguration(localVerbosity: .minimal, remoteVerbosity: .minimal)18builder.encodingParameters = EncodingParameters(audioBitrate:16, videoBitrate:0)19// Enable recommended Grid mode Bandwidth Profile Options20let videoBandwidthProfileOptions = VideoBandwidthProfileOptions { builder in21builder.mode = .grid22}23builder.bandwidthProfileOptions = BandwidthProfileOptions(videoOptions: videoBandwidthProfileOptions)24/*25* Enable simulcast for Rooms with more than 2 participants26* builder.preferredVideoCodecs = [TVIVp8Codec(simulcast: true)]27*/28}
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use VP8 (default)-H.264: only if needed for interoperability reasons-Never use Simulcast |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-Use VP8 if simulcast is not supported-H.264: only if needed for interoperability reasons |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For camera | -Use VGA@24fps-Consider HD@24fps if codec has HW support |
For screen | -Use HD@24fps-Consider FullHD@24fps if codec has HW support |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Keep default (grid ) |
maxSubscriptionBitrate | -Keep it under 2500000 bps. Go higher only if battery consumption is not a concern |
dominantSpeakerPriority | -Keep default (standard ) |
maxTracks | -Keep it under 5 |
renderDimensions | -Keep defaults (VGA for standard )-You may use HD resolution for standard if capture is HD and if CPU consumption makes it possible |
Track Priority Settings
Setting | Recommended value |
---|---|
camera | -Keep default (standard ) |
screen | -Keep default (standard ) |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Inactive |
Applications using collaboration
mode typically share the following properties:
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name'3audio: true,4video: { height: 720, frameRate: 24, width: 1280 },5bandwidthProfile: {6video: {7mode: 'collaboration',8dominantSpeakerPriority: 'standard'9}10},11dominantSpeaker: true,12maxAudioBitrate: 16000, //For music remove this line13preferredVideoCodecs: [{ codec: 'VP8', simulcast: true }],14networkQuality: {local:1, remote: 1}15});
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use grid mode instead |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-If VP8 or H.264 is used by most participants, then use grid mode instead |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use HD@24fps-Consider VGA@24fps if you detect CPU overuse |
For screen | -Use FullHD@15fps-Consider HD@15fps if you detect CPU overuse |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Use collaboration |
trackSwitchOffMode | -Keep default (predicted ) |
maxSubscriptionBitrate | -Keep default (unlimited) |
dominantSpeakerPriority | -Keep default (standard ) |
clientTrackSwitchOffControl | -Keep default (auto ) |
contentPreferencesMode | -Keep default (auto ) |
Track Priority Settings
Setting | Recommended value |
---|---|
webcam | -Use low |
screen | -Use high |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Active |
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name'3audio: true,4video: { height: 480, frameRate: 24, width: 640 },5bandwidthProfile: {6video: {7mode: 'collaboration',8maxSubscriptionBitrate: 2500000,9dominantSpeakerPriority: 'standard'10}11},12dominantSpeaker: true,13maxAudioBitrate: 16000, //For music remove this line14preferredVideoCodecs: [{ codec: 'VP8', simulcast: true }],15networkQuality: {local:1, remote: 1}16});
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use grid mode instead |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-If VP8 or H.264 is used by most participants, then use grid mode instead |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use VGA@24fps-Consider HD@24fps if codec has HW support |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Use collaboration |
trackSwitchOffMode | -Keep default (predicted ) |
maxSubscriptionBitrate | -Keep it under 2500000 |
dominantSpeakerPriority | -Keep default (standard ) |
clientTrackSwitchOffControl | -Keep default (auto ) |
contentPreferencesMode | -Keep default (auto ) |
Track Priority Settings
Setting | Recommended value |
---|---|
webcam | -Use low |
screen | -Use high |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Active |
Show me the code
Android SDK
1VideoConstraints videoConstraints =2new VideoConstraints.Builder()3.maxFps(24)4.maxVideoDimensions(VideoDimensions.VGA_VIDEO_DIMENSIONS)5.build();67LocalVideoTrack localVideoTrack = LocalVideoTrack.create(context, true, videoCapturer, videoConstraints);89// Enable network quality information for local and remote participants10NetworkQualityConfiguration configuration =11new NetworkQualityConfiguration(12NetworkQualityVerbosity.NETWORK_QUALITY_VERBOSITY_MINIMAL,13NetworkQualityVerbosity.NETWORK_QUALITY_VERBOSITY_MINIMAL);1415// Enable recommended Collaboration mode Bandwidth Profile Options16VideoBandwidthProfileOptions videoBandwidthProfileOptions = new VideoBandwidthProfileOptions.Builder()17.mode(BandwidthProfileMode.COLLABORATION)18.dominantSpeakerPriority(TrackPriority.STANDARD)19.build();20BandwidthProfileOptions bandwidthProfileOptions = new BandwidthProfileOptions(videoBandwidthProfileOptions);2122ConnectOptions connectOptions = new ConnectOptions.Builder(accessToken)23.enableNetworkQuality(true)24.networkQualityConfiguration(configuration)25.enableDominantSpeaker(true)26.videoTracks(Collections.singletonList(localVideoTrack)27.encodingParameters(new EncodingParameters(16, 0) // Remove if streaming music28.bandwidthProfile(bandwidthProfileOptions)29.preferVideoCodecs(Collections.singletonList(new Vp8Codec(true))); // Enable simulcast30.build();
iOS SDK
1let format = VideoFormat()2format.dimensions = CMVideoDimensions(width:640, height: 480)3format.frameRate = 2445camera.startCapture(device: device, format: format, completion: { (captureDevice, videoFormat, error) in6// Any code needed to run after capture starts7});89localVideoTrack = LocalVideoTrack(source: camera, enabled: true, name: "Camera")1011let connectOptions = ConnectOptions(token: accessToken) { builder in12if let localVideoTrack = localVideoTrack {13builder.videoTracks = [localVideoTrack]14}15builder.isNetworkQualityEnabled = true16builder.networkQualityConfiguration =17NetworkQualityConfiguration(localVerbosity: .minimal, remoteVerbosity: .minimal)18builder.isDominantSpeakerEnabled = true19builder.encodingParameters = EncodingParameters(audioBitrate:16, videoBitrate:0)20// Enable recommended Collaboration mode Bandwidth Profile Options21let videoBandwidthProfileOptions = VideoBandwidthProfileOptions { builder in22builder.mode = .collaboration23builder.dominantSpeakerPriority = .standard24}25builder.bandwidthProfileOptions = BandwidthProfileOptions(videoOptions: videoBandwidthProfileOptions)26builder.preferredVideoCodecs = [TVIVp8Codec(simulcast: true)]27}
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use grid mode instead |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-If VP8 or H.264 is used by most participants, then use grid mode instead |
Audio codec | -Use OPUS (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For camera | -Use VGA@30fps-Consider HD@30fps if codec has HW support |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Use collaboration |
maxSubscriptionBitrate | -Keep it under 2500000 bps. Go higher only if battery consumption is not a concern |
dominantSpeakerPriority | -Keep default (standard ) |
maxTracks | -Keep it under 5 |
renderDimensions | -For high use FullHD-For standard use HD-For low use QCIF |
Track Priority Settings
Setting | Recommended value |
---|---|
camera | -Use low |
screen | -Use high |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Active |
Applications using presentation
mode typically share the following properties:
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name'3audio: true,4video: { height: 720, frameRate: 24, width: 1280 },5bandwidthProfile: {6video: {7mode: 'presentation',8dominantSpeakerPriority: 'standard'9}10},11dominantSpeaker: true,12maxAudioBitrate: 16000, //For music remove this line13preferredVideoCodecs: [{ codec: 'VP8', simulcast: true }],14networkQuality: {local:1, remote: 1}15});
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use grid mode instead |
Video codec (multiparty Rooms) | -Use VP8 Simulcast (critical for the participant publishing the main track)-If VP8 or H.264 is used by most participants, then use grid mode instead |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use HD@24fps-Consider VGA@24fps if you detect CPU overuse |
For screen | -Use FullHD@15fps-Consider HD@15fps if you detect CPU overuse |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Use presentation |
trackSwitchOffMode | -Keep default (predicted ) |
maxSubscriptionBitrate | -Keep default (unlimited) |
dominantSpeakerPriority | -Keep default (standard ) |
clientTrackSwitchOffControl | -Keep default (auto ) |
contentPreferencesMode | -Keep default (auto ) |
Track Priority Settings
Setting | Recommended value |
---|---|
webcam | -Use low |
screen | -Use high |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Active |
Show me the code
1Twilio.Video.connect('$TOKEN', {2name: 'my-room-name'3audio: true,4video: { height: 480, frameRate: 24, width: 640 },5bandwidthProfile: {6video: {7mode: 'presentation',8maxSubscriptionBitrate: 2500000,9dominantSpeakerPriority: 'standard'10}11},12dominantSpeaker: true,13maxAudioBitrate: 16000, //For music remove this line14preferredVideoCodecs: [{ codec: 'VP8', simulcast: true }],15networkQuality: {local:1, remote: 1}16});
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use grid mode instead |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-If VP8 or H.264 is used by most participants, then use grid mode instead |
Audio codec | -Use Opus (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For webcam | -Use VGA@24fps-Consider HD@24fps if codec has HW support |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Use presentation |
trackSwitchOffMode | -Keep default (predicted ) |
maxSubscriptionBitrate | -Keep it under 2500000 |
dominantSpeakerPriority | -Keep default (standard ) |
clientTrackSwitchOffControl | -Keep default (auto ) |
contentPreferencesMode | -Keep default (auto ) |
Track Priority Settings
Setting | Recommended value |
---|---|
webcam | -Use low |
screen | -Use high |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Active |
Show me the code
Android SDK
1VideoConstraints videoConstraints =2new VideoConstraints.Builder()3.maxFps(24)4.maxVideoDimensions(VideoDimensions.VGA_VIDEO_DIMENSIONS)5.build();67LocalVideoTrack localVideoTrack = LocalVideoTrack.create(context, true, videoCapturer, videoConstraints);89// Enable network quality information for local and remote participants10NetworkQualityConfiguration configuration =11new NetworkQualityConfiguration(12NetworkQualityVerbosity.NETWORK_QUALITY_VERBOSITY_MINIMAL,13NetworkQualityVerbosity.NETWORK_QUALITY_VERBOSITY_MINIMAL);1415VideoBandwidthProfileOptions videoBandwidthProfileOptions = new VideoBandwidthProfileOptions.Builder()16.mode(BandwidthProfileMode.PRESENTATION)17.dominantSpeakerPriority(TrackPriority.STANDARD)18.build();19BandwidthProfileOptions bandwidthProfileOptions = new BandwidthProfileOptions(videoBandwidthProfileOptions);2021ConnectOptions connectOptions = new ConnectOptions.Builder(accessToken)22.enableNetworkQuality(true)23.networkQualityConfiguration(configuration)24.enableDominantSpeaker(true)25.videoTracks(Collections.singletonList(localVideoTrack)26.encodingParameters(new EncodingParameters(16, 0) // Remove if streaming music27.bandwidthProfile(bandwidthProfileOptions)28.preferVideoCodecs(Collections.singletonList(new Vp8Codec(true))); // Enable simulcast29.build();
iOS SDK
1let format = VideoFormat()2format.dimensions = CMVideoDimensions(width:640, height: 480)3format.frameRate = 2445camera.startCapture(device: device, format: format, completion: { (captureDevice, videoFormat, error) in6// Any code needed to run after capture starts7});89localVideoTrack = LocalVideoTrack(source: camera, enabled: true, name: "Camera")1011let connectOptions = ConnectOptions(token: accessToken) { builder in12if let localVideoTrack = localVideoTrack {13builder.videoTracks = [localVideoTrack]14}15builder.isNetworkQualityEnabled = true16builder.networkQualityConfiguration =17NetworkQualityConfiguration(localVerbosity: .minimal, remoteVerbosity: .minimal)18builder.isDominantSpeakerEnabled = true19builder.encodingParameters = EncodingParameters(audioBitrate:16, videoBitrate:0)20// Enable recommended Presentation mode Bandwidth Profile Options21let videoBandwidthProfileOptions = VideoBandwidthProfileOptions { builder in22builder.mode = .presentation23builder.dominantSpeakerPriority = .standard24}25builder.bandwidthProfileOptions = BandwidthProfileOptions(videoOptions: videoBandwidthProfileOptions)26builder.preferredVideoCodecs = [TVIVp8Codec(simulcast: true)]27}
Codec Settings
Setting | Recommended value |
---|---|
Video codec (1-to-1 Rooms) | -Use grid mode instead |
Video codec (multiparty Rooms) | -Use VP8 Simulcast-If VP8 or H.264 is used by most participants, then use grid mode instead |
Audio codec | -Use OPUS (default) |
Video Capture Settings
Setting | Recommended value |
---|---|
For camera | -Use VGA@30fps-Consider HD@30fps if codec has HW support |
For screen | -Use HD@15fps-Consider FullHD@15fps if codec has HW support |
Network Bandwidth Profile Settings
Setting | Recommended value |
---|---|
mode | -Use presentation |
maxSubscriptionBitrate | -Keep it under 2500000 bps. Go higher only if battery consumption is not a concern |
dominantSpeakerPriority | -Keep default (standard ) |
maxTracks | -Keep it under 5 |
renderDimensions | -For high use FullHD-For standard use HD-For low use QCIF |
Track Priority Settings
Setting | Recommended value |
---|---|
camera | -Use low |
screen | -Use high |
Other API settings
Setting | Recommended value |
---|---|
Network Quality API | Active |
Dominant Speaker Detection | Active |