Kmplayer Codec 2.5.1 Incompatible

[Su Strawderman]

As we all know, iPhone supports MP4 file format and in most cases, MP4 videos will be playable. However, sometimes you may fail to play MP4 files on your iPhone. The major possible reason is that MP4 is a container format which may contain different codecs that are not compatible with iPhone. iPhone only accepts MP4 encoded H.264, MPEG and HEVC codec. Besides, there are some other possible reasons that may lead to iPhone not playing MP4 error. Fortunately, there are always solutions out there that can help us fix this error. In this article, we'll introduce some possible to help you solve MP4 not playing on iPhone error.

Here we only explain why you cannot play downloaded or transferred MP4 videos on iPhone. The MP4 files recorded by your iPhone is excluded in this situation since they can be played without any problem.1. Incompatible codecs in MP4. The MP4 is a container format that can contain various video and audio codecs. If the MP4 file uses an encoding format that iPhone doesn't support, iPhone won't play the MP4 file.

2. The MP4 file has been corrupted. During MP4 video recording, transferring or downloading, the file may be damaged or corrupted. Under such a circumstance, the MP4 file won't play on iPhone as well as other media players.

3. The MP4 video resolution, FPS or bitrate is too high. Sometimes, you can play MP4 on iPhone, but gets choppy playback. That's because your MP4 video is in 4K/8K resolution and has high FPS or bitrate.

5. Native Video or TV App doesn't support MP4. The native video or TV app on your iPhone doesn't support MP4 playback. In such situation, you're recommended to download a third-party media player.

When your iPhone can't play an MP4 video, the possibility is the MP4 video is encoded with iPhone unsupported codecs. And converting MP4 to iPhone supported format like H.264-encoded MP4 could be the surest way to make it playable on iPhone. Then you can transfer the converted new file to iPhone for flawlessly playback no matter you're using the native player app or third-party player.

There are numbers of tools that can help you convert MP4 for successfuly playback on iPhone. If you're confusing about choosing an suitable one, you're recommended to adopt EaseFab Video Converter for help. It can convert and compress any HD, 4K, 8K MP4 files and other video files to different formats and smaller sizes for seamless playback on any device, media player and other platforms.

Step 1. Launch EaseFab Video Converter on your PC or Mac, click Add Video button to load your source iPhone incompatible MP4 files. (Note: batch conversion is supported, so you can load more than one file to save time.)

Tips: You can click Settings button beside the profile and enter into the parameter settings page. A slew of other variables such the video/audio codecs, pixel dimensions, frame rate, bit rate, audio sampel rate, etc. will help convert iPhone unrecognized MP4 files to smaller H.264 MP4 file. Please note: Adjusting these variables have some effect on the re-encoded video quality. Remember the file size and video quality is based more on bitrate than resolution which means bitrate higher results in big file size, and lower visible quality.

Besides transcoding MP4 for iPhone, there is another solution - that's downloading a third-party video player. There are many apps that can help you play almost any video format, including MP4 on your iPhone. Below are 3 popular third-party video players for iPhone.

VLC is generally considered one of the best video players which can help you play almost all MP4 files on any iPhone handset. The app supports many video formats, including all the most common file types and codecs. For Mac and iOS users, VLC also supports AirPlay streaming video and audio.

Infuse is another free iPhone video player that will give you an impeccable experience. It supports the majority of the popular video formats, including AVI, MP4, WMV, and MKV, among others. As a result, you can enjoy videos at your convenience without the conversion process. Infuse is also interesting because it supports drag and drops transfers. Additionally, it provides multitasking capability as well as the gesture controls that are accompanied by easy and impressive subtitles.

KMPlayer is an excellent app for you to stream and play MP4 on iPhone. It's suitable for anyone who wants to stream content in high resolution. You can use it to watch 4K, UHD, and FHD videos (if your iPhone model supports it). The app can potentially play even 8K content.

iPhone can only recognize the file with .mp4 extension compressed in H.264, MPEG, or HEVC (iPhone 7/7 Plus or later). If your MP4 file is encoded with other codecs (like HEVC, AV1, Prores, etc.), it can't not be opened or played with iPhone. And codec incompatibility is the main reason for iPhone not playing MP4 error. You can download and install a third-party media player to fix this error. If this method is not working, then converting MP4 to iPhone compatible format is the final and 100% working solution. No matter MP4 files downloaded online or recorded by GoPro, DJI, Canon, etc. camera, EaseFab Video Converter can do the MP4 conversion perfectly.

VLC media player is a widely used multiple media player that supports a wide range of video and audio formats. However, when playing H.265 (also known as High Efficiency Video Coding, HEVC, or x265) video files on VLC media player, very chances we'll encounter problems. Below are some of the most common issues:

These H265 HEVC videos may be created on iPhone (high efficiency mode), GoPro, DJI, Mirrorless digital cameras such as Canon EOS R7, EOS R10, and other consumer and prosumer devices. It's annoying if you cannot playback HEVC videos and enjoy the content. To save your time and successfully solve these issues, the most simple way is to choose a video codec converter and change HEVC/H.265 into H.264 codec, which is more compatible with VLC media player. If you are not sure how to do it, you can find the answer in the first solution below. Keep reading.

There are still various reasons that will cause the HEVC playback error on VLC. For example, the audio and video streams in the MP4/H.265 file don't sync properly, the original video files are downloaded improperly due to an accidental interruption, an out-of-date VLC or graphics card driver, or simply, the video file is just poorly damaged by viruses.

However, the most likely reason that H.265 won't play can ascribe to incompatible codec format. Some of you might wonder can VLC play x265 format? Yes. VLC adds the native support for x265 codec since version 3.0. Unfortunately, VLC supports HEVC codec but that doesn't mean it can decode x265 codec for fine. Thus, the most effective solution would be re-encoding H.265/HEVC to a format that is more compatible with the VLC media player.

The once for all solution to fix the H.265 not playing in VLC is converting HEVC to H.264 or any formats well-supported by VLC with VideoProc Converter AI - an all-in-one video processing, converting, and editing software. To be specific, you can convert MP4/H.265 to MP4/H.264, AVI, MKV, MOV, 3GP, FLV, VOB, DVD-Video, etc, which you'll find under the 'Target Format' tab in VideoProc Converter AI.

Note: The Windows version now supports AI-powered Super Resolution, Frame Interpolation, and Stabilization to enhance video and image quality. These AI features are not yet available in the Mac version but will be coming soon.

After you download and install VideoProc Converter AI, launch it up. Hit +Video and select the H.265 video(s) that you can't play on VLC for adding to the program. Alternatively, directly drag the target H.265 files from computer to VideoProc Converter AI.

If you're encountering the error message "Codec 'hevc' (MPEG-H Part2/HEVC (H.265)) is not supported." on an old VLC media player (version 2.2 or earlier version), then downloading and installing the libde265 codec pack might help you play HEVC videos on VLC correctly. However, what's worth noting is, if you just install H.265 codec for VLC, the playback problem may still happen next time when you run into another incompatible codec issue.

An out-of-date hardware card driver might render your HEVC videos cannot play in VLC media player. To fix the playback error caused by this, we can go to the official site of the graphics card manufacturer and follow the guide to download and install the right driver. Alternatively, follow the below steps to auto-detect, download, and install the latest available driver for your graphics card.

The latest release of VLC media player should have no problem playing HEVC videos on recent computers. Thus, in some cases, upgrading our VLC to the latest version can fix the VLC can't play HEVC error.

If the VLC media player can play most of your HEVC videos, except for some high bit-depth ones (such as 16 bit and 32 bit), then changing the output to Direct3d9 might make sense. Sadly, some users report Direct3d9 will cause new issues. One of the most annoying issues happens when users play a different video, VLC plays the audio of the new video but it still shows the image of the last frame of the initial played HEVC video.

It might be the 4K UHD resolution that causes your VLC can't play HEVC videos. 4K videos are everywhere, but it's still a challenge for VLC media player and most video players decoding the enormous amount of visual information involved by 4K videos. After all, a 4K HEVC video contains 4 times of the data compared to an HD HEVC video.

The lucky things, saving or playing videos in 4K resolution is not always necessary as HD videos still give us good picture quality. Most importantly, HD requires much less resources for computer and media players to work with. Thus, it's a good idea to compress 4K HEVC files to HD HEVC or HD H.264 files for playing HEVC 4K files on VLC without error. To get there, we can use VideoProc Converter AI. This all-in-one 4K to 1080P converter supports level-3 GPU acceleration, ensuring you can enjoy 47X faster conversion speed than the real-time play, even on a less-robust machine.

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