TRTCVideoEncParam

[Field description] video resolution
[Recommended value]
- For mobile video call, we recommend you select a resolution of 360x640 or below and select Portrait (portrait resolution) for resMode.
- For mobile live streaming, we recommend you select a resolution of 540x960 and select Portrait (portrait resolution) for resMode.
- For desktop platforms (Windows and macOS), we recommend you select a resolution of 640x360 or above and select Landscape (landscape resolution) for resMode. [Note] to use a portrait resolution, please specify resMode as Portrait; for example, when used together with Portrait, 640x360 represents 360x640.

[Field description] resolution mode (landscape/portrait)
[Recommended value] for mobile platforms (iOS and Android), Portrait is recommended; for desktop platforms (Windows and macOS), Landscape is recommended.
[Note] to use a portrait resolution, please specify resMode as Portrait; for example, when used together with Portrait, 640x360 represents 360x640.

[Field description] video capturing frame rate
[Recommended value] 15 or 20 fps. If the frame rate is lower than 5 fps, there will be obvious lagging; if lower than 10 fps but higher than 5 fps, there will be slight lagging; if higher than 20 fps, the bandwidth will be wasted (the frame rate of movies is generally 24 fps).
[Note] the front cameras on certain Android phones do not support a capturing frame rate higher than 15 fps. For some Android phones that focus on beautification features, the capturing frame rate of the front cameras may be lower than 10 fps.

[Field description] target video bitrate. The SDK encodes streams at the target video bitrate and will actively reduce the bitrate only in weak network environments.
[Recommended value] please see the optimal bitrate for each specification in TRTCVideoResolution. You can also slightly increase the optimal bitrate. For example, TRTCVideoResolution_1280_720 corresponds to the target bitrate of 1,200 Kbps. You can also set the bitrate to 1,500 Kbps for higher definition.
[Note]you can set the videoBitrate and minVideoBitrate parameters at the same time to restrict the SDK's adjustment range of the video bitrate:
- If you want to "ensure clarity while allowing lag in weak network environments", you can set minVideoBitrate to 60% of videoBitrate. - If you want to "ensure smoothness while allowing blur in weak network environments", you can set minVideoBitrate to a low value, for example, 100 Kbps. - If you set videoBitrate and minVideoBitrate to the same value, it is equivalent to disabling the adaptive adjustment capability of the SDK for the video bitrate.

[Field description] minimum video bitrate. The SDK will reduce the bitrate to as low as the value specified by minVideoBitrate to ensure the smoothness only if the network conditions are poor. [Recommended value] you can set the videoBitrate and minVideoBitrate parameters at the same time to restrict the SDK's adjustment range of the video bitrate:
- If you want to "ensure clarity while allowing lag in weak network environments", you can set minVideoBitrate to 60% of videoBitrate. - If you want to "ensure smoothness while allowing blur in weak network environments", you can set minVideoBitrate to a low value, for example, 100 Kbps. - If you set videoBitrate and minVideoBitrate to the same value, it is equivalent to disabling the adaptive adjustment capability of the SDK for the video bitrate. [Note]default value: 0, indicating that a reasonable value of the lowest bitrate will be automatically calculated by the SDK according to the resolution you specify.

[Field description] whether to allow dynamic resolution adjustment. Once enabled, this field will affect on-cloud recording.
[Recommended value] this feature is suitable for scenarios that don't require on-cloud recording. After it is enabled, the SDK will intelligently select a suitable resolution according to the current network conditions to avoid the inefficient encoding mode of "large resolution + small bitrate".
[Note] default value: false. If you need on-cloud recording, please do not enable this feature, because if the video resolution changes, the MP4 file recorded in the cloud cannot be played back normally by common players.