My friend gave me a series of anime movies, I'm dying to watch them on my iPod or PSP, but they are all in MKV format! I tried to convert them to MP4 files, but either the subtitles were gone or the quality suffered. A bunch of converters I have tried, none satisfied me well until someone recommend me Aneesoft MKV Video Converter. This is really a good software, fast conversion speed, good video quality, what's more, quite easy to use! It's so cool. If you want to find the best means to convert MKV files to MP4 files without losing quality and subtitle you should download it for a try, and here is a step guide about how to use it.
Things you’ll need
1. Aneesoft MKV Video Converter (Free for download trial version)
2. MKV video files
Step 1: Download & install Aneesoft MKV Video Converter
We’ll be using the very nice video converter software called Aneesoft MKV Video Converter for converting MKV videos to MP4 format, head over here and download the free trial version. Next step is to install the program.
Step 2: Run Aneesoft MKV Video Converter and add MKV video files
Now run Aneesoft MKV Video Converter and click the big button "Add..." to add MKV video files on your computer, you may add as many videos as you want to convert to MP4 videos. Only the titles you checked will be converted. So if there're some videos you don't want to convert, you need to uncheck them or 'Remove' them from the right-click menu. 'Clear' in the right-click menu means remove all titles in the list.

Step 3: Edit videos: crop, trim, add effects, add watermark
Wanna edit your videos to make it more personalized? You may add a watermark in Aneesoft MKV Video Converter. Just select the title you'd like to add watermark, then click the button 'Edit' to launch video editing window. If you want to crop video or add some special effects, click the first two tabs. You're able to add a text watermark or an image watermark (you may call it logo) on the output video. Adjust the 'Transparency' to make the watermark look better.

Step 4: Merge some separate MKV videos to 1 single MP4 file
Click on the video titles you'd like to merge to 1 single file, then click 'Merge' button and uncheck the former separate files if you just need the single merged video file. Here 'click on the video titles' is not just check the options, you need to click them to make them highlight. You may see the image below to have an idea.

Step 5: Change the output settings to convert videos with best quality
Choose the most suitable MP4 output files as you want. Besides MP4 files, there are almost all common video formats available for you to choose to convert. You may convert MKV videos to different video formats for video editing or playback on your mobile devices, such as iPod, iPhone, PSP, cellphone, etc. Remember that the output file size mostly depends on the Bitrate you set. Larger Bitrate, larger file size. Actually video with bitrate as 768 is acceptable for watching.

Step 6: Start converting MKV videos to MP4 videos
Now you may click the big button "Start" to begin converting MKV videos to MP4 videos. Once the convert is complete, Aneesoft MKV Video Converter will place a new version of your video. Double-click the new MP4 file and play it to make sure it looks as you expect.

