Why is there no sound when iPhone makes video?

The volume is not adjusted properly when shooting video.

Turn off microphone permissions.

The solution is to see if the microphone is blocked by dust or tape.

See if microphone permissions are turned on.

Take it to the repair shop for professional appraisal.

Both the first generation iPhone and iPhone 3G have a 2 megapixel rear lens with fixed focal length. They don't have flash, optical focal length and autofocus, so they don't support shooting videos. Users of iPhone 3G can purchase third-party applications in the app store, and jailbreaking of IOS can also achieve this effect. IPhone OS 2.0 introduces the geographic tagging function of photos.

The camera lens of iPhone 3GS is made by OmniVision, with a 3.2 megapixel lens, which supports autofocus, automatic white balance and automatic macro (up to 10 cm), and can shoot 640 x 480 short films (VGA resolution) with 30 frames per second. Although it is different from high-end CCD camcorder, it shows the effect of rolling shutter, which can cut short films on iPhone and upload them directly to YouTube, MobileMe or other networks.

IPhone 4 has a 5 megapixel lens (2592× 1.936 resolution), which can shoot 720p short films and support high resolution shooting. It also has a back-illuminated sensor, which can shoot in low light, and the LED flash can always be on when shooting. This is the first iPhone that can shoot with high dynamic range. The iPhone 4 also has a front lens for video calls, which can take VGA photos and SD short films. Stored records can be synchronized to the computer, sent as email attachments, or sent together with MMS (if supported).

IPhone 4S' rear lens function has been upgraded to 8 million pixels, supporting 1080p short film shooting. With the update of IOS system, you can enter the camera function from the lock screen, or press the shutter by increasing the volume button (+). The built-in gyroscope can keep the image stable when recording short films. With iPhone 4S and iPhone 5 of iOS 6 or higher, you can take panoramic photos through the built-in camera program, and iPhone 5 can take photos while shooting short films.

The IPhone 5 is said to be able to capture the purple fog emitted by the light source, although the Consumer Report pointed out that it "is not so easy to capture the purple fog generated by bright light sources compared with previous generations of IPhones or other Android phones with fine lenses ..."

Among the five iPhone models, the mobile phone can quickly press the Home button twice to enter the camera program. All models using iOS 5 can also directly execute camera programs when the screen is locked.

The new iPhone 6s and iPhone 6s Plus have several upgrades, with the front and rear cameras upgraded to 5 million pixels/12 million pixels respectively.

The beta program of iOS 7 indicates that Apple may assemble a slow-motion shooting mode in the lens of the next generation iPhone.