First you can read the following questions: 
Question 1: “Just want some advice on how long it should take to convert a movie to mp4 for my Google Nexus 7. At moment its takes like 12 hours to convert a 120 minutes movie from mkv to mp4 format using one free video converting program. Is this right or am I doing something wrong. Please help. thank u.” Answer: Encoding speed is related to many factors, like your CPU processing speed, hard disk writing speed, Disc Drive reading speed, etc. I used Pavtube Android Video Converter to convert Nexus 7 compatible .mp4 file because it offers perfect Nexus 7 preset profile and this format shrinks a 100min movie into around 1GB and still keeps good quality and aspect ratio. Question 2: I just received my new Galaxy Tab S tablet yesterday, and it is really amazing for playing games and watching movies with it. But I have some video playback problems when I transfer movies to Tab S. I had many MKV movies on my computer and want to play them on my brand new Galaxy Tab S 10.5, tried many ways but still no luck, is there an easy solution to solve this problem and help me out? Thanks in advance. Answer: MKV, a common HD and SD video format, is famous for multiple subtitles and audio tracks, and due to its complexity, it is not well supported by lots of tablets (Galaxy Tab S is no exception), and there isn’t an all-in-one player that are able to play all your MKV videos. So it is really a headache. For people who fail to play 1080p or 720p MKV movies on Galaxy Tab S tablet, this best MKV to Galaxy Tab S Converter is the way to go. It will easily convert MKV (as well as other Galaxy Tab S incompatible formats like AVI, MOV, WMV, MTS, FLV, F4V, MXF, Tivo, etc.) movies to H.264 *.mp4 format to get them play on Galaxy Tab S. Question 3: “I recently purchased a Samsung Galaxy Note 4, and there is a problem for me to watch my HD MKV movies. The tablet always tells me that the video formats are not supported. What can I do with it? Unable to watch MKV movies on Galaxy Note 4 really upsets me a lot, I need a solution.”
Answer: Well, don’t be upset, it’s a common problem for nowadays digital products. Only you need to do is to convert your files into MP4 format, the friendly format for Galaxy Note 4. How to do so? Good question! Here I think Pavtube Android Video Converter is the best choice for you. With it, you can reformat all video files to the target format you want, and edit your videos as well, like to trim, crop, split, and merge, which enables you to make your own films.
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Below is a step-by-step guide about:
Method 1: Play MKV files on Android by converting MKV to Android support formats
The best way to play MKV movies on Android is to change MKV to Android compatible formats like MP4. To achieve it, you can use Pavtube Android Video Converter to convert MKV format to Android friendly MP4 and then transfer then converted MP4 files to your Android device. (P2: If you’re using a Mac, Pavtube Android Video Converter for Mac will help you convert and transfer MKV video clips to Android phones/tablets on Mac OS X (Mavericks and Yosemite).) Just download it and follow the tips to put MKV videos on Android Tablet and Phone. 
Install and launch the program after downloading it. The software interface is as below. Generally, the conversion process can be completed in 3 simple: Step 1. Click “Add video” to load the SD or HD MKV videos to the program. If you have multiple MKV files, this Mac MKV Converter for Android supports batch conversion. Tip: If you want to personalize your MKV videos, you can clip or edit them: clip videos to get the wanted segments, crop the black bars and adjust video effects. 
Step 2. Click Output Format and choose MP4 for your Android device model as the output video format. Of course, you can customize the video and audio settings if necessary. 
Step 3. Press the “Convert” button to begin converting your MKV videos for playback on any Android Phone/Tablet. Tip: Apart from MKV, this Android Video Conversion program can also convert videos in other popular formats like WMV, FLV, AVI, VOB, MTS, MPEG, RMVB, TS, MPG, M4V, MP4 and more to Android supported video formats quickly while retaining the original video quality. This Android optimized Video Converter uses GPU acceleration to speed up encoding process and is much faster than free tool handbrake. Bingo! Now just wait for the conversion to be done. Then click “Open” to get the converted Android playable videos and transfer them to your device for play smoothly. Ready to download the program and have a try?
Method 2: Play MKV on Android by installing an Android MKV player
Though Android devices don’t support MKV playback natively, you can still play MKV on Android without converting the MKV files. There are many free MKV players for Android in the market and most of them are free. Popular Android MKV players include BSPlayer FREE, Dice Player and MX Video Player. With a smart player installed on your Android device, you can play MKV movies without conversion on your Android device. Note that though there are so many MKV players for Android, many of them can’t play HD 720p or 1080P MKV videos in high quality on your device. What’s more, some apps will slow download your device. So it’s still recommended that you convert the videos on your computer and then transfer the converted videos to Android devices for playback on the go. Also you are free to import your DVD movies, iTunes DRM and video from BBC iPlayer to Android tablets and phones for playback.
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