The MKV is an open standard free container format, a file format that can hold an unlimited number of audio, video, subtitle tracks or picture in one file. This format offers a richer media experience than any other current format, this makes MKV a popular choice for making back-ups of DVD and Blu-ray discs that you could also play on a computer connected to a TV. iPhone 6S/6S Plus users need to play HD MKV files but failed, how to get through? 
Apple unveiled the next flagship phone- iPhone 6S/6S Plus on September 9, 2015. Reports suggests this new iPhone could be slightly thicker and larger than the previous models- iPhone 6/6 Plus. And it will be more powerful by equipping the A9 processor paired with 2GB of RAM. As for screen display, a particularly durable rumor shows that the new iPhone will come with a sapphire display, which would offer a higher degree of scratch and shatter-resistance than the current models’ Gorilla Glass. However, it can get pretty frustrating when some of the MKV files in HD just don’t seem to play well or not recognized by iPhone 6S/6S Plus at all.
iPhone 6S supported video/audio formats:
Video formats: H.264 video up to 1080p, 60 frames per second, High Profile level 4.2 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format.
Audio formats: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV.
As you see, many common video formats like MKV, H.265 etc. cannot be played on iPhone 6S/6S Plus directly. But with an appropriate video to iPhone 6S (Plus) converter in hand, the video format incompatibility issue with the new iPhone 6S/6S Plus will be solved. Here, Pavtube Video Converter is all that you need.
- Pavtube old official address: http://www.pavtube.com/video_converter/
- Amazon Download: http://download.cnet.com/Pavtube-Video-Converter/3000-2194_4-75734821.html
- Cnet Download: http://download.cnet.com/Pavtube-Video-Converter/3000-2194_4-75734821.html
How to convert HD MKV to iPhone 6S/6S Plus?
Step 1: Download and install the program. Click “Add video” on the main interface to load HD MKV files to the program. You can also drag the files to the program’s window list directly. This program can also support thebatch video clips.
Step 2: Select the right formats for iPhone 6S/6S Plus. Here we suggest you to go to the “HD Video” list, you will get the “H.264 HD Video (*.mp4)”as the best output.
Step 3: Click “Settings” button to customize the output video and audio settings by yourself. But if you are not good at it, you’d better use the default parameters, they will ensure you a good balance between file size and image quality basically. You can change the resolution, bit rate, frame rate as you need.
Step 4: With all the preparations work done? Why not go back to the main interface to click the “Convert” button to get the work started?
Conclusion: Once the conversion is finished, click “Open” to quickly find the converted files. Then, iPhone 6S/6S Plus will recognize, catalog, play and stream them just fine.
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