Dual-camera recording is much heavier than ordinary single-camera recording. The app may run camera capture, live preview, real-time composition, audio processing, video encoding and Photos saving at the same time. 4K, 60 fps, Front+Back capture, Dual Rear capture, Front Beauty, Color Style filters, full-screen layouts and long continuous recording can raise device temperature and system pressure.

When iOS reports high pressure, DualCapture may lower the active recording spec or stop and save the current recording. This is intended to protect the device and preserve the footage already captured. If this happens often, let the phone cool down, avoid direct sunlight, close other camera or video apps, and try 1080p / 30 fps for longer sessions.

Before showing quality options, DualCapture checks the camera formats supported by the current device and lens combination. When the actual camera session starts, iOS can still apply a stricter hardware budget based on MultiCam usage, temperature, battery and system load.

If the requested combination is not stable enough, the app chooses a lower supported setting instead of failing the recording. For example, a high-pressure Front+Back or Dual Rear setup may fall back to 1080p / 30 fps. For important recordings, use the spec shown as available in Settings and keep enough free storage.

60 fps is especially demanding because the app has much less time to process each frame. Even at 1080p, 60 fps can be harder to sustain than 4K / 30 fps when Front+Back capture, full-screen composition, Front Beauty or Color Style filters are enabled. For longer or more stable recordings, 30 fps is usually the safer choice.

In full-screen Front+Back capture, if Front Beauty or Color Style is enabled, DualCapture may keep the same layout and aspect ratio while controlling the final pixel area. This reduces real-time rendering and encoding pressure without changing how the composition looks.

Front Beauty and Color Style filters both process camera frames in real time. When they are combined with Front+Back capture, 60 fps, full-screen layouts or long recording, some devices may not have enough performance headroom to keep recording stable.

On some devices, DualCapture may ask you to keep only one of these effects. If you continue, the app applies the effect you are turning on and closes the other one. If you cancel, your current settings remain unchanged.

Color Style is treated as one overall Front+Back effect, not just a single camera filter. This means that when Front Beauty needs to close Color Style for stability, both front and rear Color Style filters are turned off together.

Multi-camera capture depends on more than the number of lenses on the phone. The device must support Apple's MultiCam session, and iOS must allow the selected cameras to run together. Dual Rear capture needs a supported rear wide + ultra-wide combination. Front+Back capture also checks whether the selected front and rear lenses can form a stable pair.

This means some phones may support Single Cam Dual output but not native Dual Rear capture, and some rear or front lens choices may be hidden because the current combination cannot run reliably. Try the default wide lens first, or switch to Single Cam Dual when a true multi-camera mode is unavailable.

Video stabilization requires support from the active camera connection and adds extra processing cost. To keep multi-camera recording stable, DualCapture currently applies stabilization only when the device supports it and the active spec is 1080p / 30 fps or lower.

At 4K, 60 fps or other high-load MultiCam combinations, stabilization may be turned off even if the switch is enabled. If stabilization is more important than maximum resolution, lower the recording spec to 1080p / 30 fps and avoid combining it with other high-pressure options.

Changing resolution, frame rate, lenses, export mode or capture scene can require rebuilding the camera session. Rebuilding a session while a video file is being written can damage the current recording or interrupt audio and video synchronization.

For this reason, DualCapture asks you to stop recording before changing these settings. Stop and save the current clip first, then switch modes or adjust settings before starting the next take.

Audio recording depends on microphone permission and system audio availability. If microphone permission is denied, the microphone is temporarily unavailable, or another app is occupying audio, DualCapture may record a silent video instead of blocking the capture completely.

If you need sound, check iOS microphone permission for DualCapture, stop other apps that are playing or recording audio, and start a new recording after the app shows the camera is ready.

The torch depends on the active main camera, the physical lens and the current system state. In multi-camera sessions, iOS can disable torch access when the device is warm, under heavy pressure, or when the active lens and connection do not support it.

If the torch is unavailable, try switching to a lower recording spec, use the default wide lens, reduce device temperature, or use external lighting for long dual-camera recordings.

After you stop recording, the app still needs to finish video files, close encoders, save the result to the system Photos library and clean temporary files. Longer videos, higher resolution, higher frame rate and multiple outputs all increase this work.

Keep the app open until the save message is complete. Also make sure Photos permission is enabled and your device has enough free storage, especially before long 4K or split-output recordings.

The free version can use the core camera experience, including basic Front+Back capture, Portrait+Landscape capture, photos, videos and default appearance options. Pro unlocks advanced capabilities such as 4K capture, high video quality, high photo quality, Front+Back split export, lens selection, premium app icons, more accent colors, Liquid Glass styling, watermark control and video stabilization.

If the current setup contains Pro-only features, the app may ask you to unlock Pro or downgrade to a free setup before recording. Downgrading keeps the capture available by returning Pro-only options to their free defaults.

Subscription plans and membership status come from the App Store through StoreKit. They require network access and a working Apple in-app purchase service. If the network is restricted, the App Store is slow, or Apple's service is temporarily unavailable, the plan list may fail to load.

Check that DualCapture can use the network, make sure you are signed in to the App Store, then close the purchase page and try again later. The app retries product loading, but App Store responses can still take time.

Restore Purchases uses the Apple ID currently signed in to the App Store. If the purchase was made with another Apple ID, the subscription expired, the purchase was refunded, or App Store synchronization is delayed, the app may not find an active entitlement.

Check your App Store purchase and subscription history with the Apple ID you used for the purchase. If you bought Lifetime while already subscribed monthly or yearly, remember that Lifetime does not automatically cancel an existing subscription; manage auto-renewal in App Store subscriptions.

DualCapture photos are generated from the latest live camera frames. Right after entering a mode, switching lenses or rebuilding the camera session, the app may need a moment before both preview streams have delivered usable frames.

If you see this message, wait until the preview is stable and try again. It is especially common immediately after opening Front+Back capture, changing layout, switching lenses or returning from another app.

双摄录制比普通单摄录制更消耗性能。应用可能同时进行相机采集、实时预览、实时合成、音频处理、视频编码和相册保存。4K、60fps、前后双拍、双后摄同录、前摄美颜、摄影风格、全屏构图和长时间连续录制，都会更容易提高设备温度和系统压力。

当 iOS 报告设备压力较高时，DualCapture 可能会降低当前录制规格，或自动停止并保存当前录制。这是为了保护设备，并尽量保住已经录到的内容。如果经常出现这种情况，建议让手机降温，避免阳光直射，关闭其它相机或视频类 App，并在长时间录制时优先使用 1080p / 30fps。

显示清晰度和帧率选项前，DualCapture 会先检查当前设备和镜头组合支持哪些相机格式。真正启动相机会话时，iOS 还会根据多摄并发、温度、电量和系统负载，给出更严格的硬件预算。

如果用户选择的组合不够稳定，应用会自动选择一个更低但可运行的规格，而不是直接让录制失败。例如高压力的前后双拍或双后摄同录，可能会降到 1080p / 30fps。重要录制前，建议优先使用设置页中可选的稳定规格，并确认设备有足够存储空间。

60fps 尤其消耗性能，因为应用处理每一帧的时间更短。即使是 1080p，在同时开启前后双拍、全屏构图、前摄美颜或摄影风格时，60fps 也可能比 4K / 30fps 更难长时间稳定运行。如果更看重长时间录制和稳定性，建议优先选择 30fps。

在前后双拍全屏构图下，如果开启了前摄美颜或摄影风格，DualCapture 可能会在保持画面布局和比例不变的前提下，控制最终输出的像素面积，用来降低实时渲染和编码压力。

前摄美颜和摄影风格都需要实时处理相机画面。当它们和前后双拍、60fps、全屏构图或长时间录制叠加时，一些设备可能没有足够的性能余量来保证录制稳定。

在部分设备上，DualCapture 可能会提示你只保留其中一个效果。如果你选择继续，应用会开启当前正在打开的效果，并关闭另一个效果；如果你选择取消，当前设置不会发生变化。

摄影风格会按前后双拍的整体效果处理，不只是一侧镜头的滤镜。因此当前摄美颜为了稳定性需要关闭摄影风格时，前摄和后摄的摄影风格会一起关闭。

多摄拍摄不只取决于手机有几个镜头。设备需要支持 Apple 的 MultiCam 会话，iOS 也必须允许当前选中的摄像头组合同时运行。双后摄同录需要系统支持后置主摄 + 超广角组合；前后双拍也会检查当前前摄和后摄能否组成稳定组合。

因此，有些设备可能支持“单摄双输出”，但不支持真正的“双后摄同录”；有些前摄或后摄镜头也可能因为当前组合不稳定而不展示。遇到不可用时，可以先使用默认主摄，或在双后摄不可用时切换到单摄双输出。

视频防抖需要当前相机连接支持，也会增加额外处理压力。为了保持多摄录制稳定，DualCapture 当前只会在设备支持、且当前规格不高于 1080p / 30fps 时启用防抖。

在 4K、60fps 或高负载多摄组合下，即使设置里打开了防抖，实际录制也可能关闭防抖。如果你更看重画面稳定性，建议把规格降低到 1080p / 30fps，并尽量避免同时开启其它高压力选项。

修改清晰度、帧率、镜头、导出方式或拍摄场景，可能需要重建相机会话。如果在视频文件写入过程中重建会话，可能导致当前视频损坏，或造成音画不同步。

所以 DualCapture 会要求你先停止录制，再修改这些设置。建议先停止并保存当前片段，确认保存完成后，再切换模式或调整设置开始下一段拍摄。

录音依赖麦克风权限和系统音频状态。如果麦克风权限被拒绝、麦克风暂时不可用，或其它 App 正在占用音频，DualCapture 可能会录制无声视频，而不是直接阻止拍摄。

如果你需要声音，请检查 iOS 设置中 DualCapture 的麦克风权限，停止其它正在播放或录音的 App，并在相机准备完成后重新开始录制。

手电筒依赖当前主摄、物理镜头和系统状态。在多摄会话中，如果设备发热、系统压力较高，或当前镜头和连接不支持手电筒，iOS 可能会临时禁用手电筒。

如果手电筒不可用，可以尝试降低录制规格、使用默认主摄、让设备降温，或在长时间双摄录制时使用外部补光。

停止录制后，应用还需要完成视频文件收尾、关闭编码器、写入系统相册并清理临时文件。视频越长、清晰度越高、帧率越高、输出文件越多，等待时间就越长。

保存完成前请尽量保持 App 打开。也建议确认相册写入权限已开启，并在长时间 4K 或分路素材录制前预留足够的存储空间。

免费版可以使用核心拍摄体验，包括基础前后双拍、纵横双拍、照片、视频和默认外观能力。Pro 会解锁更高级的能力，例如 4K、高视频画质、高照片画质、前后双素材导出、前后双拍镜头选择、高级 App 图标、更多主色调、液态玻璃风格、水印控制和视频防抖。

如果当前配置包含 Pro 功能，应用可能会在拍摄前提示你开通 Pro，或降级为免费配置后继续拍摄。选择降级后，相关 Pro 选项会回到免费默认值，以保证拍摄可以继续进行。

订阅方案和会员状态来自 App Store，并通过 StoreKit 同步，需要网络访问和 Apple 内购服务可用。如果网络受限、App Store 响应较慢，或 Apple 服务短暂异常，订阅方案可能暂时加载不出来。

可以先确认 DualCapture 允许使用网络，并确认当前设备已登录 App Store。然后关闭购买页，稍后再试。应用会自动重试加载商品，但 App Store 的响应有时仍需要等待。

恢复购买会读取当前 App Store 登录的 Apple ID。如果购买时使用的是另一个 Apple ID、订阅已经过期、购买被退款，或 App Store 同步有延迟，应用可能无法找到有效权益。

建议检查你购买时使用的 Apple ID，以及 App Store 的购买记录和订阅记录。如果你已经购买永久会员，同时还有月度或年度订阅，请注意永久会员不会自动取消已有订阅；如需停止自动续订，需要到 App Store 订阅管理中取消。

DualCapture 的照片会从最新的实时相机画面生成。刚进入某个模式、切换镜头或重建相机会话后，应用可能需要一点时间，等主副两路预览都拿到可用画面。

如果看到这个提示，请等预览稳定后再拍一次。它通常出现在刚打开前后双拍、刚调整布局、刚切换镜头，或从其它 App 返回之后。