Software Tips & Tutorials

Convert MKV to HEVC? No, You May Say H264 MKV to H265 MKV/MP4 Transcoding

HEVC/H.265 Converter: Re-encode MKV (H264) to HEVC or Convert MKV to HEVC Encoded MP4 Video

MKV (Matroska) is an open source free container format that can have Selectable subtitle/audio/video streams, Chapter entries, Full metadata (tags), Menus (like DVDs have), etc.

HEVC (High Efficiency Video Coding) is a compression scheme or standard to improve video quality at the same bit rate or reduce the file size (about 50%) at the same level of video quality.

There are some easily mistaken concepts about converting MKV to HEVC, such as:

The file extension of HEVC video is .hevc.
- The file extensions of HEVC/H.265 can be .mkv, .mk3d, .mka, .mks of Matroska container; can be .ts, .tsv, .tsa used by ATSC, DVB and Blu-ray disc of MPEG transport stream; also can be .mp4, .3gp, .3g2, .mj2, .dvb, .dcf, .m21 as ISO based media file formats.

The file extension of Matroska video is .mkv.
- Yes, but MKV is not the only file extension of Matroska video. mk3d .mka .mks are also its extensions.


When HEVC (x265) is encoded in MKV and MP4 containers, at the same bitrate with the same codec, the video will be the same.

What will differ however is what the container supports. MKV will accept almost anything you throw at it, while mp4 has a lot of restrictions on what you can put in it.

Therefore, upon the topic converting MKV to HEVC, we should consider it into two situations:
1. When the original MKV is HEVC encoded
2. When the original MKV is not HEVC encoded

Let's see how to convert MKV to HEVC video in details.

Part 1: MKV to HEVC: How to Convert H.264/AVC MKV to HEVC/H.265 MKV

Since HEVC promises a 50% storage reduction, it is necessary to convert or re-encode MKV to HEVC if its video codec was AVC or say H.264, the predecessor of H.265.

WinX HD Video Converter Deluxe, a professional MKV converter, will help you transcode HD (720p/1080p) or 4K AVC MKV to HEVC MKV by encoding video at the lowest possible bit rate without loss in visual quality. As a result, the output file size will be greatly reduced to save storage, and the conversion will be turbo fast basically due to the industry-leading hardware and software accelerations utilized synchronously.

Operating System: Windows 2000 – Windows 10 (32 bit & 64 bit); Mac OS X Snow Leopard - macOS High Sierra (10.13)

Convert MKV to HEVC on PC

Step 1: Download, install and open the HD video converter on your PC or Mac.

Step 2. Input and load MKV video.
Click "+Video", browse on your computer to find the source MKV (H.264) video file, and click Open to add it to the MKV to HEVC converter.

Step 3. Choose HEVC Video as the output.
Scroll down on the Output Profile window, click PC General Video under Common Video Profile and select HEVC Video (Codec: HEVC + aac), which will transcode MKV H.264 to MKV HEVC video. Click OK.

Step 4. Edit the video.
If necessary, you can tune video audio parameters and make editing. For example, you can adjust the Frame Rate from 23.97 to 25/29.97/30, upscale the resolution from 720p/1080p to 2K/4K like 2560x1440, 4960x2160, 3840x2160, etc, you can add srt subtitle file, cut and trim the video, or merge video clips.

Step 5. Start converting H264 MKV to HEVC MKV.
Set where to save the output file by browse for the Destination Folder, and tap RUN button.
>> How to Fast Convert H.264 4K to H.265 4K

As you can see below, after converter to HEVC, the original MKV (AVC codec) video file size is reduced by more than 50%.

Load 4K Video to Video Converter

Part 2: How to Convert MKV to MP4 HEVC Video without Re-encoding

If the original MKV file is with HEVC codec, WinX HD Video Converter Deluxe as an efficient HEVC converter, is able to convert it to MP4 HEVC video in 1 minute with the "Auto Copy" feature. More outstanding, there will be zero quality loss in this superfast conversion mode, and the Max Frame Rate can reach over 1000 fps.

Step 1. Download, install and launch WinX HD Video Converter Deluxe on your Windows or Mac computer.

Convert MKV to HEVC on PC

Step 2. Input source MKV video.
Click "+Video", browse on your computer to add the source MKV (HEVC) video to the MKV converter.

Step 3. Choose HEVC MP4 Video as the output.
Click General Profiles on Output Profile, scroll down and find HEVC Video [MP4 file format with hevc (h.265) video; Codec: hevc (h.265) + aac]. Click OK.
Note: Although the same, the HEVC Video profile is different from that in PC General Video. The difference lies in the output video format, one is MP4, and the other is MKV.

Step 4. Check "Auto Copy".
Check "Auto Copy" option under Deinterlacing on the right of the main interface. "Auto Copy" is an impressive feature to pass through MKV video to MP4 video at superfast speed if the codec keeps the same. Accordingly, it will convert MKV HEVC to MP4 HEVC without re-encoding.

Step 5. Make editing and adjusting.
Optionally, you can cut, trim, crop, merge videos, and adjust parameters (such as resolution).

Step 6. Set Destination Folder and RUN.
You can set where to save the output file on your HDD, and click RUN to start converting MKV to MP4 video.

WinX HD Video Converter Deluxe - Convert and Compress Any HD/4K Videos

▶ Simplest and fastest video conversion and compressing solution with hevc support.
▶ Convert video formats or codes of any HD and UHD (4K) videos, e.g. H.264 to HEVC, MKV to MP4.
▶ Download videos or music from YouTube, etc., edit videos, and make slideshows.
▶ Intel® and NVIDIA® powered Level 3 Hardware Acceleration. Fast and Stable.

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