Try updating QuickTime or your codec packages. Could be just not reading them correctly. Have you looked for graphics ard updates? Some brands are having problems with Windows 10 and releasing updates to fix the problem. Attach a dxdiag.txt and we can take a closer look. __________________________________
CORNBLOSSOM

Thank You for your input. I have updated Quicktime and video card software - no difference. I created an MP4 file that displayed no video on my desktop. Copied that file to my laptop and it played fine. I think you are on the right track with the codec issue. I will do the dxdiag. What should I be looking for? JohnT

Just post the DxDiag results here and people will let you know if anything stands out. We're looking at everything from your system specs to the installed drivers and to see if there have been any severe app crashes.

Since you're on Win10, there are a couple of threads you should review. This *one* and especially this *one* although most of the problems there were with AVI files the solution may still be appropriate for you.

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From what I've been reading, Microsoft no longer supports MP4.. although it still works on my laptop. I've sent MP4 files to various friends and it's a hit and miss situation. Some can view it, others can't. I guess it's not worth the frustration. In the future, when I send video files, I'll just use .MOV. JohnT

I don't know what you're referring to with regard to MS not supporting MP4, and I don't think that's the issue you're having.

Obviously go ahead and use MOV or M2TS or HEVC or WMV or XAV C - there's no right or wrong format, just plenty of choices!

If you want to figure out what's going on with MP4s on your system, the forum's always here

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Hi JohnTS
I am working with W10 pro/PD13 and made a lot of Test with MP4
in 264 and 265...Absolut Clean and 100% !
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I'm currently using Windows 10, PD13 on my laptop and it works fine and produces MP4 videos that I can view on my laptop without a problem. The issue is when I send an MP4 file to someone else (including my desktop computer). Last week I sent an MP4 video to 4 people and none of them could view it (audio but no video). All were using various versions of Windows 8. Also, if I create an MP4 file using PD13 on my desktop, the video cannot be viewed on the desktop but it can be viewed on my laptop. If I create a MP4 file with PD12, it can be viewed on my desktop ok. To me, the problem is not PD13 but something to do with Windows...codecs maybe. It's frustrating, and my solution right now is to just avoid creating MP4 files. JohnT

Your solution is a good one. If you wanted to figure out why your MP4s aren't working on some machines, you could attach a sample clip so other members can test it.

It the clip is larger than 30MB, upload it to a cloud folder and post the link

YouTube/optodata

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See the comment below:

https://support.microsoft.com/en-us/kb/316992

“The MPEG-4 file format, as defined by the MPEG-4 specification, contains MPEG-4 encoded video and Advanced Audio Coding (AAC)-encoded audio content. It typically uses the .mp4 extension. Windows Media Player does not support the playback of the .mp4 file format. You can play back .mp4 media files in Windows Media Player when you install DirectShow-compatible MPEG-4 decoder packs. DirectShow-compatible MPEG-4 decoder packs include the Ligos LSX-MPEG Player and the EnvivioTV.”
JohnT

Thanks for posting that. This is a fairly technical document and it's easy to overlook some of the relevant details or to draw incorrect conclusions by looking at a single sentence.

For example, the sentence you quoted is talking about the MP4 file format, NOT the video encoder format.

The paragraph just before the line you quoted states this important info "Although video compression and file container definition are two separate and independent entities of the MPEG-4 specification, many people incorrectly believe that the two are interchangeable. You can implement only portions of the MPEG-4 specification and remain compliant with the standard."

So the sentence you quoted is simply stating that MS has chosen to NOT implement the file format as part of their effort to remain in compliance with the standard. A couple paragraphs later, they state that "Microsoft has chosen to implement the video compression portion of the MPEG-4 standard. Microsoft has currently produced the following MPEG-4-based video codecs: Microsoft MPEG-4 v1; Microsoft MPEG-4 v2; Microsoft MPEG-4 v3; ISO MPEG-4 v1" so it's very clear that they DO support MP4 codecs, which is at the heart of being able to create and play back any video.

Also, if you look at the big table you can see that none of the older players (reading from right to left) supported any of the newer formats (the lowest rows), but WMP 12 supports all of them, including all the MP4 variants.

SO, the bottom line is that MS is not going to take away any support for MP4, and in fact they've just added the ability of WMP to play all kinds of MP4 files that none of their previous player ever could. That means you won't need to use a third party player like VLC to play MP4 videos. WMP12 is the version that comes with Win10 systems, and that's as current as you can get

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OK, you got me... I am definitely confused about this stuff. So, what's my problem. With PD13 created MP4 "File" will play on my laptop but not the desktop that created the file. As I mentioned earlier, PD12 will produce MP4 file on my desktop that plays everywhere. JohnT

Quote: ... I am definitely confused about this stuff.

It's completely understandable! PD does a great job of hiding the immensely technical guts of video editing, encoding, decoding and transcoding deep within the program so users can focus on the more relevant aspects of creating videos. Only when problems come up do we have to worrry about what's going on "under the hood," and my first response to you explained what we'd need to understand what's going on with your production machine.

Something's clearly different with it compared to your laptop, and if you could run the simple DxDiag command and post the results that would give us a good place to start. I'd also like to see a sample of your original clip, because the codecs installed with Windows and PD aren't able to work with every possible format, and your source clips may be recorded in one that isn't fully supported by PD.

We can usually figure out what's happening and come up with a workaround (like you already did by switching to a different producing format), or find a codec pack or settings change in Windows or PD that will get you going again.

If you have a source clip that's less than 30MB in size, you can attach it when you post your DxDiag results. If you don't have anything that small, just upload it to a cloud driver like OneDrive or DropBox and share the link.

YouTube/optodata

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I tried to send the DxDiag earlier but it was rejected I guess because it looked unsafe:

Error Detail
This page can't be displayed by security issue.
Maybe your request have unfriendly content.
Contact support for additional information.
The incident ID is: 528747957893916531
The session ID is: N/A JohnT

Is there a way to up load a text file or video to this thread. JohnT

JohnTS Is there a way to up load a text file or video to this thread.

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Thanks for the file submit information, but I don't have those options... maybe because I'm a newbie here JohnT

Everyone has access to the buttons Playsound pointed out, newbie or not. When you type your responses, don't use the Quick Reply box at the very bottom of the page. Click the big postreply button on the bottom left of the last post and you'll get the screen with the buttons.

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Attached video will play ok on my my Dell Inspiron 15R but not on my desktop where it was made. Both computers are Windows 10, PD13. JohnT

Thanks very much for uploading your clip

You're using the H.265 HEVC encoder which is very new, and I wonder if you'd still have the issues if you produced to the same profile in H.264 AVC [MPEG-4 1280x720 24p (16Mbps)]

I have no trouble importing, playing or editing the clip here on my Win10 desktop, so I'm really starting to think that the reason your friends can't play it is because their PCs can't play HEVC videos. Even though you're producing to "MP4" it's the codec you're using that matters and I'd be very surprised if you or your friends had any problems with the H.264 settings I listed above.

Please try producing to that and see how it goes. When you get a chance, please run the DxDiag test and attach the results for your desktop. It will still be helpful to see what's going on there.

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