Apple has introduced support for HEVC in macOS 10.13, iOS 11 & tvOS 11. So the resulting MP4 will only play on video players that support H265/HEVC. If you are converting an MKV that has a H265/HEVC video track, the same thing happens, this video-track is embedded unmodified into the resulting MP4 file. Therefore just embedding the video-track unmodified into the MP4 works great in most cases and is very fast and reliable. Nearly all MKV files contain H264 video-tracks, which is excatly the video-codec expected in MP4 files. Only the audio-track is often converted for increased compatibility. The video is taken as-is and embedded into the resulting MP4 file without being altered. The important thing to know here is that MKV2MP4 does not alter the video-track of a MKV in any way. Some (image-based) subtitle formats are not transcoded (see subtitle question) and even subtitles that are properly converted may not be displayed on some devices that do not support subtitles embedded in MP4 files (like the PS3).(Exception, there is the option to include additionally a surround-sound channel of the selected language, if available). All additional audio tracks are discarded. At this time MKV2MP4 only converts the selected audio track from the MKV to the MP4 file.Some rare MKVs contain video in non-standard formats like VP9, these videos will fail to convert or play.Some files (that contain too many ref-frames, 10-bit video or are larger than FullHD) will not play on some devices like the PS3 that don't support these features.MKV2MP4 does not do video downscaling, it is not suited for converting HD videos for playback on devices that don't support HD resolutions.If you change MKV2MP4 preferences to do a faster but less compatible conversion, the resulting files will still play perfectly on most devices/players (PS3, VLC, QuickTime), but not everywhere (notably not on iOS devices). Since MKV2MP4 does not do video downscaling, it is not suited for converting HD videos for playback on devices that don't support HD resolutions (like the iPhone 3G). The iPhone 5 plays HD videos converted by MKV2MP4 fine. For example, the iPhone 3G will not play full HD videos. The only exception is that some devices play MP4s, but not of any resolution. The converted files are compatible with every device and player that can play MP4 files (Video Players on Mac/PC, Smart TVs, Gaming Consoles, iPhone/iPad etc). Q: Can I use other files than MP4 as input, e.g. Q: How can use MKV2MP4 to create videos for the AppleTV? Q: What is the difference between MKV2ATV and MKV2IOS? Q: What is the difference between MKV2ATV and MKV2MP4? Q: What is the difference between MKV2PS3 and MKV2MP4? Q: What limitations does MKV2MP4 have? Are all audio-tracks and sub-tiles converted? Q: On what devices can I play the converted video files?
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