Posted by Amanda Hu | Last updated: October 12, 2019
Proverbially, MP4 won't play on Windows and Mac (Catalina) has been a perplexing problem for a long time, even though you have updated your Windows Media Player or QuickTime to the newest version. Happily, there are gushes of solution to MP4 file won't play problem in Google search results that can drag you out from the confusion if you have the patience to look through the methods one by one and find the best workaround for your question. To make things easier, here we gather all MP4 video won't play on Windows/Mac issues on a page with solutions to help you solve can't play MP4 files on Windows Media Player, QuickTime, VLC, etc without opening pages again and again.
With built-in comprehensive video audio codec including MP4 (HEVC H.263/H.264/H.265, AAC, etc), 5KPlayer is surely the ideal MP4 player when your Windows Media Player, QuickTime, VLC, etc can't play MP4 video files. No need to download a codec pack, convert the MP4 video format or install a plugin. Nothing is better than 5KPlayer to play MP4 files on Windows /Mac [Catalina].
★ VLC Can't Play MP4 Video Files? [Solved]
VLC plays most codecs with no codec packs needed: MPEG-2, MPEG-4, MPEG-4 ASP, H.264, DivX 4/5/6, XviD, SV1, 3ivX D4 and H.264/MPEG-4 AVCMKV, AMR, WebM, WMV, MP3, etc. However, MP4 files containing codecs like H.265 and other VLC unsupported audio video codecs cannot be read by VLC. Besides download VLC codec pack from its official website and converting the MP4 format to solve MP4 won't play on VLC, there is another situation you have to notice.
VLC Hardware Decoding Limitation: Though MP4 is a lightweight file format for playing, downloading and streaming, it's still inevitable for MP4 4K (2160X4096) video to contain too many audio video tracks for hardware decoding. You need to disable hardware video decoding in VLC:
Launch VLC -->Tools --> Preferences --> Show All Settings
--> Input / Codecs --> Video Codecs --> FFmpeg
--> Uncheck "Hardware decoding"
Now close VLC and open it again, load your MP4 videos and see if your MP4 won't play problem has been solved or not.
Actually, it is risky to download a codec pack that may bring adware/malware/virus to your computer and time-consuming to convert a video formats step by step. Upgrading your default MP4 player often a paid method and resetting the preference is also quite complicated. Why not try an easier and free way.
5KPlayer – the best free solution to solve MP4 won't play on Windows /Mac: No need to download any codec pack, convert the MP4 format or reset your MP4 player, you can play MP4 files encoded with different codecs smoothly and in high quality, plus a lifetime free upgrade on Windows 10/8/7 and Mac (OS X/OS Sierra). 100% compatible with codecs in MP4 including H.263, H.264, H.265, AAC, MPEG-4, DivX, VP9, HEVC, etc, 5KPlayer will surpass your imagination.
Besides playing MP4 video files, 5KPlayer, as a multimedia player also supports VLC-compatible formats (MPEG-2, MPEG-4, MPEG-4 ASP, etc), Windows Media Player-adaptable formats (WMV, AVI, ASF, MPG, WMA, MP3, WAV, etc), QuickTime-recognizable formats (MOV, M4V, MP3 and M4A) and 4K UHD 1080p 720p HD etc videos. Available for online video music download, you can get various movie song resources with 5KPlayer from YouTube, Dailymotion, Vevo, etc at will.
Step 1. Get the professional MP4 player – 5KPlayer.
Free download 5KPlayer, install and run it on your PC/Mac. 5KPlayer is a 100% clean free software containing no plugin, malware, virus.
Step 2. Play MP4 files with 5KPlayer in 3 ways.
1. Click the "Video" icon on the main UI of 5KPlayer and choose the MP4 file you want to play from the popping up window.
2. Find the MP4 video file you saved in your local folder, then drag and drop the file directly to this MP4 player to open.
3. Right-click the MP4 file locally-stored and choose Open with 5KPlayer.
Step 3: No need to worry about the MP4 won't play issue, just enjoy your MP4 video files.
* You can also handle your 4K UHD 1080p 720p HD MKV FLV MP3 AAC OGG etc following the guide listed above.
* If you have no MP4 files, you download them online with 5KPlayer.
* When you play MP4 with 5KPlayer, this MP4 player also offers you the capability to stream MP4 videos to HDTV via AirPlay.
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