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How to Convert MKV to MP4 on Mac OS X (El Capitan/macOS Sierra included)

It happens to all of us. There is a MKV file you wanna watch on your MacBook or iMac. You click on it, trying to open with default player QuickTime, but end up with an error message "There is no application set to open mkv". Similar case, when you play MKV on game consoles, such as PS3, PS4 or Xbox One, your MKV video is still unplayable. What's worse, you transfer MKV videos to iPhone iPad to watch on the trip, but iTunes tells you the MKV file is incompatible with your device. In other cases, when uploading MKV files to YouTube or Facebook, you encounter a heavy Waterloo, again. Why could these be? Mainly because MKV is incompatible with majority of the modern mobile devices and platforms, alongside with its comparatively large file size.

To make MKV playable on most devices and platforms, you need to convert MKV to MP4 since MP4, also a container format, keeps quite a good balance between high quality and file size. And more importantly, it's compatible with almost all the players, devices and platforms.

Having said that, which video converter is reliable to convert MKV to MP4? Many users choose VidCoder. But some of them reflect on forum.videohelp that the speed of Vicoder is fast, less than 1 hour to convert a 1.62 hour length MKV video (3.08GB), but the video quality is not up to the mark. Worse still, it only works on Windows. For Mac users, Handbrake is worth a try. Indeed, it free converts MKV to MP4 on Mac, but takes almost 4 hours. I know this quite ruins your mood, but luckily, there is a truly helpful free Mac video converter that can meets all your needs.

To Convert MKV to MP4 on Mac in High Quality, Fast Speed and Suitable File Size, You Need:

MacX Free MKV Video Converter, a totally free yet 100% clean video converte, lets you free convert MKV to MP4 with fast speed since the built-in hyper-threading tech uses computer processor resources more efficiently, enabling multiple threads to run on each core and even better the Multi-core CPU utility supports up to 8 cores to assign the whole conversion task to multiple cores (based on your computer's configuration), just like one person's workload now being equally shared to 8 men. A big relief for CPU! As for video quality, the advanced High Quality Engine comes for that purpose, alongside with the De-interlacing tech to help correct interlaced image to normal de-interlaced one. If you need to compress and shrink MKV file size, the below part will elaborate 3 different ways in detail.

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After free converting MKV to MP4 on Mac OS, it's time to transfer MKV files to iPhone (iPhone 7/6s/SE), iPad Pro/Mini 4, iPod and more mobile device under the help of the top iPhone transfer - MacX MediaTrans, the cutting-edge iPhone manager to sync video, music, photos and more from iOS iPhone iPad to Mac computer and vice versa.

How to Convert MKV to MP4 on Mac OS X Mountain Lion, Yosemite, El Capitan or macOS Sierra

Step 1: Import MKV file by clicking "Add File".
After free download the best MKV to MP4 converter for Mac OS X macOS Sierra, click "Add File" button to load the MKV files.

Step 2: Choose the Output Video Format.
Select the output video you desire. If you want to convert MKV to MP4 on Mac OS X macOS Sierra, you go "Mac General Video" and choose "MP4 video". With this best MKV video converter freeware, all the parameters of profile can be provided for you to customize the output video like resolution, frame rate, bit rate, sample rate, etc that would better fit your player or portable devices.

Best MKV to MP4 converter for Mac

Step 3: Select Output Folder.
The third step for MKV to MP4 conversion is to click the "Browse" button to choose the path where you want to save the output files in.

Step 4: Start to Convert MKV to MP4 on Mac.
Followed by a click on "RUN" button, which gives an order to this top free MKV to MP4 converter for Mac to begin to transcode MKV to MP4 on Macbook 2016, iMac Retina, Macbook Air/Pro, etc. Only seconds and you will get the output MP4 files with lossless quality (High Quality Engine tech built-in).

Step 5: Time for MKV to iPhone Transfer. (Optional)
This is not a must-have step, but the one for those who gonna transfer MKV video from Mac to iPhone. You just free download and launch MacX MediaTrans and then enter its "Video" section to "Add Video" from Mac to this video transfer app. Afterwards, give a hit to "Sync" button and then the MKV videos are transferred to your iOS iPhone iPad iPod within seconds only (Intel QSV supported).

transfer MKV to iPhone

Note: Besides the abovementioned feature, this Mac MKV to MP4 converter also supports to convert any SD or HD videos like convert AVI to MP4, convert FLV to MOV, convert MKV to FLV for uploading to YouTube, playing MKV on iTunes, editing in iMovie, and playing on iPad, iPhone, iPod, Apple TV, Blackberry, etc.

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【Update】 Questions & Answers to MKV to MP4 Conversion on Mac

Question 1:
Converting MKV to MP4 fails. Hello, I'm trying to convert an MKV container to MP4 / M4V while maintaining the existing video and audio codecs (HEVC x265 and AAC audio ). I used the "Convert/Stream" function and selected the "keep original video track" and "keep original audio track" checkboxes. The problem is that the resulting M4V output file contains only the audio track; the video is missing. If I use the "Streaming/Exporting Wizard" instead of the "Convert/Stream" function, the MP4 output option is greyed out and can't be selected unless I enable transcoding to 264 (which I don't want to do). Any ideas? Running VLC 2.2.1 on OS X El Capitan. Thanks! - cinergi from forum.videolan

Answers:
The highest possible reason why you fail to convert MKV to MP4 on Mac with HEVC x265 is that x264 works fine in MP4 file container while x265 is not supported in an MP4 container, at least not in VLC. So if you insist on converting MKV to HEVC x265, you're suggested to ditch away VLC player, instead using the advanced version - MacX Video Converter Pro to convert MKV to HEVC x265.

convert MKV to HEVC

Question 2:
MKV-MP4 Converter. I have a lot of HD MKV files that I wish to convert for iTunes. I want a converter, but need to keep the same good quality!! (the videos/movies are 720 and 1080p) Any suggestions please? OS X or Windows, I can use both. Linux too if it crops up.. Thanks - Vortar from mac-forums

Answers:
You see, iTunes supports video formats including MP4, MOV, M4V, limited types. If you're itching to convert MKV to iTunes, one way is to convert MKV to MP4 iTunes acceptable format. Another better way is to directly convert MKV to iTunes profile, with iTunes best parameter settings. In case you are a layman and don't know much about iTunes suitable video parameter settings, you'd better resort to the MKV to iTunes conversion with most ideal profile offered.

convert MKV to iTunes

Free Convert MKV to MP4 on Mac with No.1 Fast Speed

MacX Free MKV Video Converter lets you convert MKV to MP4 format on Mac with seconds only, a 5-min length video only 8 seconds.

• All-around Video Converter: Convert any video to over 180 video formats and 14 popular audio formats on Mac OS X, such as WebM to MP4, M2TS to MP4, MKV to AVI, WMV to MOV, FLV to AVI, AVCHD to MOV, etc.
• Convert Video to Android iPhone iPad: Super fast speed to convert videos to iPhone iPad Android with best parameter settings and video editing features.
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