Why does my Gopro black 3+ video look so bad on PRE11 while editing & after DVD creation playback.

Question

Well let start with.  When I do a project with video from my Samsung S4 phone or my IPhone 5 or my Canon T4i  looks great on computer screen and when I play back a burned DVD or AVHCD.  I just directly import from file on my hard drive.  My Samsung is at 1920x1040 30fps mp4 .  I believe the IPhone is a 1920x1080 MOV format.
It is the GoPro video that  PRE11 has a problem with.  I record at 1920x1080 30fps.  Nothing special.
First the computer screen.  On both of my computers when I right click on the playback screen.
Quality Highest; Magnification Fit; Safe Margin unchecked; Playback External device None; Aspect Hardware; Desktop Audio; 24Progresive Conversion Interlaced 2332; Export External Device DV 29.97 720; Checked Disable video output.
As for Publish.  DVD I use preset NTSC widescreen dvd; AVCHD h264 1920x1080I ntsc.
Any other ideas why the GoPro video looks bad on computer screen & on dvd on hd tv.
Some say you first must convert GoPro mp4 to AVI then import.  That seems crazy.  Why can Samsung mp4 work great and GoPro mp4 not.
It seems that Adobe has not correctly written code for MP4 from on of the largest camcorder producers.

Answer 1

john1234321
Thank you for starting your own new thread on your Premiere Elements workflow after initially posting in the thread of another.
Adobe Premiere Elements 13 Latest Developments
For your convenience, this is a copy of my reply to you in that thread which was left unanswered
johng1234321
Thank you for the reply. What I was looking for mostly are the properties of the 1920 x 1080p30 GoPro3+ Black footage that you are trying to use in
Premiere Elements 11. Are you working with the H.264.mp4 format or are you working with a Cineform.avi format? If it is the H.264.mp4 format, I am not seeing why you should be doing anything else but importing the H.264.mp4 into Premiere Elements 11 using the project preset set by you manually or the project automatically. Best you set the project preset manually to assure the correct project preset in this case.
NTSC
DSLR
1080p
DSLR 1080p30@ 29.97
There are times when the project does not interpret correctly the properties of the video when it is the first file dragged to the Timeline. When it does not do it correctly, it does not give you the closest possible fit between project preset and properties of source media, instead it gives you its default 1080i which is not appropriate for your 1080p footage.
http://www.atr935.blogspot.com/2013/04/pe11-accuracy-of-automatic-project.html
To get a better perspective on your comparison between your cell phone and GoPro results....are you saying that you can take the videos from the cell phones and import them into Premiere Elements 11 without issue, audio out of sync or other? Are you converting the cell phone video at any time - to change a variable to constant frame size or other?
Depending on your details, I would offer to look at a sample of your specific H.264.mp4 file for which you cannot get a decent DVD-VIDEO on DVD or AVCHD format on DVD disc. If you opt to do this, you might consider sending the sample via a Dropbox link posted in this thread. I am concerned that your GoPro issue on Premiere Elements 11 is going to get lost in this thread on a different topic. If we do not gain ground on the issue soon, please consider starting a new thread on your issue so that the details and especially the results will be found more easily by those users seeking answers for the type of problem that you describe.
The answers will be in the details.
Thanks for the follow ups.
ATR
ATR