Besides, there is another reason may lead you to be failed in playing 4K videos on iPhone 6 successfully? iPhone 6 usually support MOV, MPEG-1, MPEG-2, MPEG-4, 3GPP, 3GPP2, AVCHD and DV as video file formats. However, the formats of original 4K UHD videos arrange from MP4, MTS/M2TS, AVCHD and MKV to XAVC and MXF.
In fact, you can compress the 4k video size to 1080p and convert the iPhone 6 unsupported video formats to iPhone 6 supported format, then you can play 4K UHD videos on iPhone 6. And all you need is a video compressing and converting tool. Here, I suggest you to use Pavtube Video Converter For Windows/Mac > review.
It can compress 4K video file size to 1080p or even 620p to make it playable on iPhone 6. Besides, it can convert all iPhone 6 unknown 4K formats to iPhone 6 friendly format, and the app provides you with optimized preset video format for iPhone 6. Moreover, you can cut off unwanted video parts and just preserve segment out of a complete movie or remove black edges and unwanted area of image in original movie with simple operation. Furthermore, it allows you to adjust output aspect ratio, such as 16:10, 16:9, 5:4, 4:3 and 2:1 to get the best movie playback on iPhone 6.
Note: The following guide takes Mac version as example, Windows user can follow the same steps to finish the compressing and conversion.
Free download and install
Other Download:
- Pavtube old official address: http://www.pavtube.cn/blu-ray-video-converter-ultimate/
- Cnet Download: http://download.cnet.com/Pavtube-Video-Converter-Ultimate/3000-2194_4-65938564.html
Steps to compress 4K UHD video file size and convert video format to iPhone 6
Step 1. Load 4K UHD videos
Download the program, install and launch it on your PC. Then you can directly drag and drop the 4K UHD files to the app.
Step 2: Set output format
Go to the format list by clicking on the format bar to follow "iPhone" > "iPhone 6 Plus H.264 Full Screen/Full HD 1080p (*.mp4)" as the most compatible vidoe format for iPhone 6.
Tips:
1. Click “Settings” on the interface and you can adjust the parameters including size, bitrate, frame rate, etc. to get a high quality of output files or a smaller files size. Keep in mind the file size and video quality is based more on bitrate than resolution which means bitrate higher results in big file size, and lower visible quality loss, and vice versa. You can preview the size at the below chart.
2. Open "Video Editor" window and switch to the "Trim" tab, you can drag the slider bars to include the segment you want to remain, click the left square bracket to set start point, and click the right square bracket to set end point when previewing the video or directly input specific values to "Start" and "End" box.
3. Open "Video Editor" window, click "Crop" tab to remove black edges and unwanted area of images. Click the 
icon on the right-bottom to swtich to the advanced mode, then you can choose the output aspect ratio such as 16:10, 16:9, 5:4, 4:3 and 2:1 from the drop-down list of "Display Aspect Ration".
4. Click the "Subtitle" tab in "Video Editor" window, check "Enable", then you will be able to add external SRT/ASS/SSA subtitle files to the video as hard subtitles.(Difference between soft subtitles and hard subtitles)
Step 3: Start to convert
Switch back to the main interface, click the big button "Convert" on bottom-right corner to start conversion. When the process is over, you can find the converted files by clicking the "Open output folder" on the main interface of the program.
Now, transfer the compressed and converted 4K UHD video movies to iPhone 6, and enjoy them in the bed or in the car.
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icon on the right-bottom to swtich to the advanced mode, then you can choose the output aspect ratio such as 16:10, 16:9, 5:4, 4:3 and 2:1 from the drop-down list of "Display Aspect Ration".4. Click the "Subtitle" tab in "Video Editor" window, check "Enable", then you will be able to add external SRT/ASS/SSA subtitle files to the video as hard subtitles.(Difference between soft subtitles and hard subtitles)
Step 3: Start to convert
Switch back to the main interface, click the big button "Convert" on bottom-right corner to start conversion. When the process is over, you can find the converted files by clicking the "Open output folder" on the main interface of the program.
Now, transfer the compressed and converted 4K UHD video movies to iPhone 6, and enjoy them in the bed or in the car.
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