To begin with, make sure to transfer the videos that cannot be played on your iPhone to the computer. If the videos are recorded with GoPro or other cameras, you can import them to a computer with SD Adapter.
Solution 1: Resize Video to Save More Space for iPhone
It's well known iCloud Photo Library offers a flexible option to optimize iPhone storage by storing all the full-resolution originals in smaller versions on iPhone. But the problem is users of iPhone constantly reported download errors on iPhone video and ended with blank screen. To avoid this issue, here we share you the solution to shrink video on computer instead.
Step 1: Download and launch VideoProc Converter, choose Video and clik + Video to fire off the video processing feature and load the video that iPhone won't play.
Step 2: Select the output format supported by iPhone, such as MP4, MOV or M4V.
Step 3: Hit Option button with a gear icon to enter a new panel, where you can adjust resolution, codec, bitrate, frame rate and more parameters
- Lower Resolution: Videos recorded by GoPro or DJI Mavic won't play on iPhone and say unsupported. This is a typically error because of the high resolution such as 4K or 2.7. By lowering the resolution, e.g. from 4K to 1080P, the video will drastically downsized to a smaller file that your iPhone can play. Theoretically, this will degrade video quality to some extent. But there isn't any noticeable change of quality when you play the compressed video on the smaller-screen iPhone.
- Change Codec: The support for HEVC is built into iOS 11 or later. If you are working with iPhone 7 or later, be sure to convert H.264 to HEVC in such a way to reduce the file size by 50% or more without visible quality loss. If you are using an iPhone 6s or earlier, you'll then need to change HEVC to H.264 as HEVC video won't play on older iPhone.
- Reduce Bitrate: Bitrate plays a direct role of video file size. But once the bitrate reaches beyond the limit value, the video quality won't enhance, but the file size will be extremely large. You can select Manual from the drop-down menu and set the value for the specific video, say 35-45 mbps for 4K 2160P video. And choose ABR instead of CBR for the more efficient data compression.
- Decrease the Frame Rate: It's undeniable that video of higher frame rate, such as the slo-mo video at up to 240fps, eats up more storage space than normal one at the same resolution. To smoothly play a video on iPhone without video format not supported error, downgrading it's frame rate, for instance, turn a 60fps recording to 30fps file, is a good way.
- Increase GOP Value: Increasing the value of GOP will result in decreased I-frame that is far larger than B- and P- frames.
Step 4: Hit RUN button to begin processing video with optimized file size for iPhone.
Solution 2: Re-encode Video to iPhone Supported File Format
Step 1: Open VideoProc Converter and click Video button.
Step 2: Tap +Video button to load the video that doesn't play on iPhone.
Step 3: Click Target Format to choose the output format supported by iPhone. You can go to Apple Device and click iPhone Video and choose the specific iPhone model you are using. Despite compatibility varies by the model of each device and operating system version, VideoProc Converter keeps updating to support the latest model and set the best video playback settings without bothering you to adjust the obscure parameters yourself.
Download VideoProc Converter free to re-encode to fix unsupported video format on iPhone now!
Step 4: Click RUN to begin converting the iPhone unsupported video file to iPhone friendly format.
To play the file format that is unsupported on iPhone, like the MKV, AVI, FLV, WMV, MTS, AVCHD, etc, you can follow the above steps and change the incompatible video format to iPhone supported one like MP4, MOV, M4V.
However, why your MP4 or MOV video cannot play on iPhone?
iPhone supports MP4, MOV and M4V videos. However, these formats refer to the container used to hold the audio, video, text and other media data. To take MP4 as an example, it can hold H.264, AVCHD, AVC, and a few other codecs. However, only the MP4 videos that contain HEVC, H.264 or MPEG-4 video codec can play on iPhone.
Note: iPhone supports video formatted in HEVC only when it is upgraded to iOS 11 or later. The playback of HEVC video at higher resolution, e.g. 4K, on iPhone will be stuttering on older devices.
Solution 3: Cut off Damaged Video to Fix Video Format Not Supported Error on iPhone
Step 1: Open VideoProc Converter and click Video button on the main interface.
Step 2: Drag and drop the problematic video in the window or you can simply click +Video button to load the damaged video.
Step 3: Choose the preferred video format iPhone supports.
Step 4: Click Cut button below the video information. Drag the knob on the slider to select the video clips you preferred and remove the damaged area. Click Done to save the clip.
Step 5: Click RUN to begin export a new video without damaged section and then you can play video on iPhone without video format not supported error. If the video is physically damaged which minor fix won't help, just go to professional video repairing tool to get it fixed.
Are There any Other Causes Responsible for Unsupported Video Format Error on iPhone iPad?
Yes. The unsupported video format on iPhone error occurs possibly because the video is downloaded from unsafe sources or downloaded incompletely due to slow network. Except for this, if the video transferring process gets interrupted or your iPhone is turned off during the video transfer, the MP4 or MOV video cannot be played on your iPhone, and you'll get the error message as well.
For a successful video playback on iPhone, make sure to download video from reliable resource at a high-speed internet connection and sync the video files to iPhone without any interruption. If you still cannot fix the video format unsupported error, you can rely on a movie player app to check whether you can play the video back on iPhone.