MP4 Tips and Tricks

Why MP4 Files Play Slow on a Computer? How to Solve it?

September 5 2016 , Written by Bonnie

If you are facing problems like tearing, stuttering, slow or choppy playback in playing high definition movies and videos, particularly the mp4 format, then this article can provide a solution to it. 

MP4 files contain video and audio data for computer playback. One of the most common video file types, "MP4" actually refers only to the file container - the data inside may be encoded with any one of several formats, such as H.264. Therefore, even while one MP4 may play fine on your computer, another may run slowly or stutter. In many cases, slowdown during video playback is caused by outdated video drivers or codecs, running a video too high-resolution for your computer's speed, or poorly optimized video files and video players. 

Why MP4 Files Play Slow on a Computer? 

Drivers and Codecs 

Your computer utilizes several pieces of software to play back MP4 videos. The first is your graphics driver. This file tells your video hardware – either a discrete video card or the integrated graphics chip in your processor – how to handle every type of video program you run. An old version of the driver may have errors that lead to slow playback, so always keep the driver updated. Most video player software also relies on codecs. These files decode the compressed information inside the video file to play it back, and missing or outdated codecs can cause playback errors. 

Alternate Programs 

There are many types of video files, and not every video playback program handles each type perfectly. Different players use different systems to decode video – some don't even rely on codecs – so trying another player may solve slowdown. On Windows, Windows Media Player natively opens MP4 files, but if they play slowly, try downloading another player, such as VLC Media Player, Media Player Classic or Apple's QuickTime Player or iTunes. 

Damaged Files 

If only one particular MP4 plays slowly, it's likely that the file itself has errors. Video file errors can manifest in several ways, such as slowdown, skipping, stuttering or the inability to use the seek bar. If you downloaded the file from the Internet, try redownloading it in case the file was corrupted during download. If you were given the video file directly from the creator, ask them to test whether it works for them, and to render it again it if not. 

Slow Computer Speed 

If no other solutions alleviate slow playback, your computer may simply be incapable of playing the video in real-time. Video playback – especially HD video playback – uses a significant amount of processor power, so older computers may suffer from unavoidable lag. Check that no other processor-intensive tasks are running simultaneously, as these will degrade playback. Such tasks include computer games, virus scans and photo or video editing software. 

Best Solution for solving MP4 slow plaback on a computer 

According to our tests and our client feedbacks, MP4 different codecs are the main reasons for playing slowly on computer. We recommend you the best solution is transcoding MP4 to the best MP4 H.264 codec for computer using Pavtube MP4 Video Converter. With this best MP4 encoder, you can easily fix “MP4 slow playback” issue by transcoing MP4 to computer and player best playable format. Besides MP4, it can also fix all videos play slowly on computer(Windows/Mac). 

What Can Pavtube MP4 Video Converter do for you? 

  1. Encode MP4 to Windows Media PlayerVLCQuickTime Player etc supported formats 
  2. Convert MP4 to MKV, AVI, H.265, M3U8, MOV, WMV, Apple ProRes, MPEG-2 etc 250+ formats 
  3. Transcode MP4 to iMovie, FCP, FCE, Premiere Pro, Windows Movie Maker, Sony Vegas ProDaVinci Resolve and more friendly formats 
  4. Support compressing 4K MP4 to HD MP4 or SD MP4, 2D to 3D MP4H.264 MP4 to H.265 MP4 
  5. Edit MP4: add subtitles/watermark to MP4, split/trim/crop MP4, adjust MP4 video effect, edit MP4 audio etc 
  6. Batch convert MP4 - Merge MP4 files into one File 
  7. Customize MP4 video codec, size, frame rate, bitrate and audio codec, sample rate, bitrates and channels for better display quality. 

Mac version : Pavtube Video Converter for Mac 

Free download the best MP4 video converter/editor: 

Pavtube MP4 Video Converter for Windows: 


Other Download: 
- Pavtube old official address: 
- Cnet Download: 
Pavtube MP4 Video Converter for Mac: 


Other Download: 
- Pavtube old official address: 
- Cnet Download: 

How to Convert MP4 on Windows (10) with Pavtube Video Converter? 

Step 1. Load the target files 

Free download video converter, install and run it. Click "Add File" button to browse your computer hard drive and select files you want to convert. 

Step 2. Choose the output format 

Click "Format" bar, and select .mp4, .wmv etc from "Common video" or "HD video", or choose your desire format from iPhone, iPad, Apple TV, TV, Samsung, etc 

Step 3. Choose Output Folder 

Click the "Browse" button and choose the location to save your converted files. 

Step 4. Start to convert MP4 

Step 3. Click the "Convert" button on the main interface and the software will start to convert to your desire video formats immediately. When the conversion finishes, click "Open" to find the converted video files. 

PS: Computer supported formats: 

1. Windows Supported Format 

a. Windows supported video formats

Advanced Systems Formats (.ASF) 
Windows Media Video (.WMV, .WM) 
Audio Visual Interleave (.AVI) 
MPEG -1 (.MPEG, .MPG, .M1V) 
QuickTime Movie File (.MOV) 
MP4 Video File (.MP4, .M4V, .MP4V, .3G2, .3GP2, .3GP, .3GPP) 
MPEG -2 TS Video File (.M2TS) 
Matroska Video File (.MKV) 
Windows Media Metafiles - wax, wmx, asx, wx, wpl 
Microsoft Digital Video Recording - dvr-ms 
Indeo Video Technology - ivf 
Windows Media Player Skins - wms, wmz 
Windows Recorded TV Show Files - wtv 

b. Windows Supported Audio Format 

Windows Media Audio (.WMA) 
MPEG Audio Layer III (.MP3, .M3U) 
MPEG Audio Layer II (.MP2, .MPA) 
Audio for Windows (.WAV) 
CD Audio Track (.CDA) 
MP4 Audio File (.M4A) 
Windows Audio File (.AAC, .ADT, .ADTS) 
Free Lossless Audio Codec (.FLAC) 
Musical Instrument Digital Interface - midi, mid, rmi 
Audio Interchange File Format - aiff, aif, aifc 
Sun Microsystems and NeXT - snd, au 

2. What Video Formats Are Supported by Mac? 

a. Mac supported video file formats: QuickTime Movie (.mov), MPEG-4 (.mp4, .m4v), MPEG-2 (OSX 10.0-10.6 are exclusive), MPEG-1, 3GPP, 3GPP2, AVCHD (OSX 10.0-10.7 are exclusive), AVI ((Motion JPEG only), DV; 

b. Mac supported audio file formats: M4A, m4b, .m4p (all are iTunes audio), MP3, Core Audio (.caf), AIFF, AU, SD2, WAV, SND, AMR 

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