You will not know if your video was recorded with a variable frame rate without more information.
1. What computer operating system for your Premiere Elements 14/14.1?
2. What camera or device recorded the video? If a cell phone, iPad, iPhone, or one of those screen capturing programs, it is highly likely you have a variable frame rate for your video. Premiere Elements has problem with that type of video. The symptoms of that situation range from audio out of sync to not being able to import the video at all. The typical solution is taking your video into HandBrake to get the H.264.mp4 with constant frame rate version and bringing that into Premiere Elements project.
3. You have two approaches to this variable frame rate matter....
a. Before thinking about HandBrake, take the video into the MediaInfo video and audio properties readout program to determine if your video has 3 frame rates instead of 1 in the video readout. If 3, then go ahead with the HandBrake variable to constant frame rate session
b. Do not bother with the MediaInfo readout, just take the video into HandBrake, get your H.264.mp4 with constant frame rate. If it works, fine - happy with the solution and assuming that variable frame was the cause of the problem.
Besides all of the above, make sure that the project is set up correct, with properties of source media matching the project preset.
See Edit Menu/Project Settings/General to verify project settings especially if the project set those automatically.
Lots to consider.
Please consider. If you need supplemental information on this matter, please do not hesitate to ask.
The problem was actually the bitrate: since the video was very big, I converted it with a software which automatically sets bitrate as variable. I set it to fixed and it works right!
Thanks A.T. Romano and thanks Peru Bob!
Wonderful news. Great job in gaining success with your troubleshooting.
You may find it more helpful in 14/14.1 to work with Export & Share/Devices/Custom where you can use the advanced settings to define properties for the export including video bitrate VBR vs CBR, and CBR vs VBR, 1 Pass or VBR, 2 Pass and audio bitrate.
Best wishes moving forward with your Premiere Elements projects. Please let us know when and if you need supplemental information for your workflows. We look forward to the opportunity to be of assistance.
Thank you for the follow up. Appreciated.