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Black Preview Screen - iPhone Videos

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Danielle Lee
Black Preview Screen - iPhone Videos
on Jul 18, 2017 at 8:42:50 pm

Hi!

I have seen plenty of threads about this topic, but I am curious if there was something that I am doing wrong that is causing this issue. I have been using Movie Studio Platnium 12.0 for the past couple of years and especially for the last six months as I had to edit for my school's broadcast program most weekends. It has been working fine with the videos off of our DSLR cameras and I have never had this issue before starting this project.

I am now trying to edit a video with footage off of my iPhone 7. I am running into a problem where after I am editing for a couple of minutes, I'll add a new clip and then suddenly the preview screen will turn black. Sometimes if I close the program and reopen it, it'll be fine for a bit and then the preview screen will go black again. It seems like any media generated by the program itself, such as text, is fine. If I render the project when the preview screen is black, the video will not show up in the rendered video either.

I've tried putting the clips into a new project, uninstalling and reinstalling Quicktime, cleaning the project media, disabling "close media files when not the active application," turning off GPU acceleration of video processing, and reinstalling the program itself.

Here is a screenshot of my program when the preview screen is black.


I appreciate any feedback and advice on how to fix this issue.

Thanks!


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Andrew Lenczycki
Re: Black Preview Screen - iPhone Videos
on Jul 19, 2017 at 5:11:34 pm

How many individual "clips" or events do you have in your project? John Rofrano helped me to figure out that having many ".mov" clips that require QuickTime to display will cause this problem. I was using many (30 or more) short events that were in the ".mov" format. QuickTime attempts to open an "instance" for each event on your timeline, and with many clips, it gets overwhelmed and causes the "black screen" preview. How John helped me around this was to "render" the ".mov" files to an intermediary format of "MXF", then put the MXF clips on the timeline. I don't know for sure whether that is your problem or not, but you could try to render some of your clips as MXF then replace them on your timeline with the original QuickTime event.

Andrew Lenczycki


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Charles Draycott
Re: Black Preview Screen - iPhone Videos
on Jul 19, 2017 at 5:28:03 pm

Andrew, your response sounds like it could help me also. I'm having similar issues where projects filled with .mov files are becoming a pain to edit and causing multiple crashes.

Would you be able to elaborate on how one would "render the .mov files to an intermediary format of MXF"?

Hopefully this will provide some assistance to Danielle also.

Thanks in advance!

Charles "Chaz" Draycott
Motorsport and Aviation Enthusiast


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Andrew Lenczycki
Re: Black Preview Screen - iPhone Videos
on Jul 21, 2017 at 12:32:03 am
Last Edited By Andrew Lenczycki on Jul 21, 2017 at 12:38:06 am

Charles,

I went back into the forum and did a search for my name, which I found multiple times. If you want to read the whole thread (which is quite long) you can start here: https://forums.creativecow.net/thread/24/962269#962298

If you skip down the thread to John Rofrano's March 11, 2013 6:44:52 am response, I believe this explains the real PROBLEM.

Here is another part of a different thread where I'm referencing the use of the Sony MXF file:

https://forums.creativecow.net/thread/24/985931#986048

I can't find the specific spot where John Rofrano was recommending that I use the Sony MXF format, but it's essentially a "lossless" format that is used as an intermediate in your project. What I had were all these 30 second nested Vegas files that were created by another software (Digital Juice Vegas Templates), which used QuickTime file format in each. So each time an instance of QuickTime was encountered, it would open a new instance of QuickTime to try and display the 30 second event. By rendering each of these segments to Sony MXF, it was "hard coding" the video which was then no longer relying on QuickTime.

To render something to the MXF format, (I am using Vegas Pro 13.0 right now) select File|Render As, then in the dialog box that comes up, in the Output Format section, select Sony MXF (*.mxf), then the particular template for the type of output you want. At the time I was doing this, I was outputting for DVD, so I selected the "NTSC DV Widescreen" format. Recommend that you render the MXF files to a subfolder in your project folder, maybe called "MXF Intermediates". Then you would just select the MXF file you just created (rendered) and place it on your finish project timeline. This causes you to do an extra step, but for me it completely cured the problem I was having.

Hope this helps you.


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Charles Draycott
Re: Black Preview Screen - iPhone Videos
on Jul 21, 2017 at 10:42:47 am

Thank you for taking the time to reply to me in such detail with references Andrew - you're a life saver!

Charles "Chaz" Draycott
Motorsport and Aviation Enthusiast


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Danielle Lee
Re: Black Preview Screen - iPhone Videos
on Jul 21, 2017 at 1:59:31 pm

Wow! Thank you so much Andrew for the detailed response. I appreciate your help. :)


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Charles Draycott
Re: Black Preview Screen - iPhone Videos
on Jul 21, 2017 at 3:36:59 pm

The man's a hero! 😃

Charles "Chaz" Draycott
Motorsport and Aviation Enthusiast


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John Norton
Re: Black Preview Screen - iPhone Videos
on Jul 22, 2017 at 10:33:49 am

I notice Andrew mentions using nested videos. I have a very similar problem to Danielle but with quite different source material, no quicktime in use, all PAL mpeg, 720x576 25fps.
Basically very simple to edit material, and the nested projects are also similar in type.

The problem only starts when I add a piece of nested material. Example, load up project, find one complete video track, (of 6 tracks) is black, close down, reopen and maybe ok to work on all day.

Because the material type is different I picked up on the nesting reference by Andrew.

I've never had any issue like this before using nesting.

This is my post on it a few days ago.

They may also be two completely unrelated issues also i.e. one caused by Quicktime limits, and mine by nesting?

Using VP14.

https://www.vegascreativesoftware.info/us/forum/sections-of-tl-black-using-...


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Andrew Lenczycki
Re: Black Preview Screen - iPhone Videos
on Jul 23, 2017 at 5:30:05 pm

I have used Vegas Pro since version 6 Pro. I have, but never installed V11 Pro. I have but haven't used V14 Pro - I currently use V13 Pro. All I can say on the nesting of Vegas project files is that the only time I've had a problem was when I had a high number of QuickTime file imbedded. I think I've had projects with about 30 nested Vegas files without any issues (as long as they didn't contain the QuickTime format segments within). Don't know that this proves anything one way or the other, just thought I would let everyone know it hasn't been an issue for me, and getting the QuickTime format segments out (by rending them as MXF) has worked for me.

Andrew Lenczycki


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Bart Francis
Re: Black Preview Screen - iPhone Videos
on Mar 21, 2018 at 4:15:26 pm

Hi Andrew
Thanks for the info
I know this is pretty old but I'm trying to use your advice and having issues.

I used another program to create the mxf files from my iphone .mov files

Now in Vegas 14, they won't open??

Seems weird since you went through all this trouble to tell us about this and obviously it works for you.
Any idea why I'm having this issue?

Thanks


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Francois Pénzes
Re: Black Preview Screen - iPhone Videos
on Mar 21, 2018 at 10:23:24 pm

Hi Bart

MXF is a "container" or "wrapper" format which supports a number of different streams of coded "essence", encoded in any of a variety of video and audio compression formats. Just like QuikTime.

More simply put, it's like a box where you can put different things in it.

''I used another program to create the mxf files from my iphone .mov files''

Now let's get a little technical:

Sony's XDCAM MXF is supported by Adobe After Effects, Adobe Premiere Pro, Apple Final Cut Pro X, Autodesk Smoke, Avid, Capella systems, Dalet, EVS, Imagine Communications Corp., Omneon, Quantel, Rhozet, Sony Vegas Pro, Sorenson Squeeze, Telestream FlipFactory, GrassValley EDIUS, Grass Valley K2, and Merging Technologies VCube.

Panasonic's P2 MXF is supported by Adobe After Effects, Adobe Premiere Pro, Apple Final Cut Pro X, Autodesk Smoke, Avid, Dalet, EVS, GrassValley EDIUS,[3] and Grass Valley K2.

Ikegami offers camcorders capable of recording in MXF wrapper using Avid DNxHD video encoding at 145 Mbit/s, as well as MPEG-2 video encoding at 50 Mbit/s 4:2:2 long-GOP and 100 Mbit/s I-frame.

In 2010 Canon released its new lineup of professional file-based camcorders. The recording format used in these camcorders incorporates MPEG-2 video with bitrates up to 50 Mbit/s and 16-bit linear PCM audio in what Canon has called XF codec. Canon claims that its flavor of MXF is fully supported by major NLE systems including Adobe Premiere, Apple Final Cut Pro X, Avid Media Composer, and Grass Valley EDIUS.[4]

Basically, you have save your file in a format not recognized by Vegas, in a ''container'' (MXF)

Convert your file to a format recognized by Vegas (you can use handbrake to convert) Follow link below for recognized formats. (bottom of page)

https://www.vegascreativesoftware.com/us/vegas-pro/specifications/?utm_source=sonycreativesoftware&utm_medium=referral&utm_campaign=redirect&lang=us&prdt=vegaspro


Cheers !

PC Win 10 Pro 64-bit 16gb Intel® Core™i7-2600k Quad Core 3.40GHz
Cameras: Canon XF305 + Canon XH-A1
Blackmagic HyperDeck Studio Mini

''When the cutting stops, the editing begins...''


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Andrew Lenczycki
Re: Black Preview Screen - iPhone Videos
on Mar 22, 2018 at 2:15:05 pm

See Francois' post which has a lot more technical info as to why your "MXF" files may not working. I see you are using Vegas Movie Studio. I have been using Vegas PRO (13, 14, 15), which has the ability to create the MXF file format from within Vegas. My guess is that Movie Studio doesn't have that option. Francois suggests using Handbrake to "transcode" (convert) the video. I've never (had to) use Handbrake, but from all the times I've seen it mentioned in the Vegas forum, it must do the trick, because everyone swears by it. I believe it's a free download. Below is the screenshot of my Vegas Pro 15 File|Render As dialog box:



Andrew Lenczycki


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