@Gintaras' experience is a superb example of something I've been cautioning about for several years on this forum ever since H.265 was introduced as an update to the older H.264 compression scheme.
As a long time member here I've noticed that some dash cam owners lose sight of the fact that the primary purpose of dash cams is to record evidence in the event of a traffic incident. It is not just for our personal entertainment. As evidence in a legal matter you may be obligated to provide a copy of your footage in its original unedited form to law enforcement, insurance companies, attorneys, courts of law, etc.
Many of these entities will have computers that do not have the latest technologies or the required video codecs installed on their machines. Indeed, many of the people within the chain of evidence custody will not have the computer skills to know what the problem is and in fact will have no idea what the terms "H.265" or "H.264" even mean. They will only know that they cannot view your video. In all likelihood, an insurance adjuster or some other bureaucrat may simply move on to the next case.
I have learned from personal experience with dash cams that it is
vital when handing off dash cam video evidence to third parties such as a law enforcement officer, an insurance company, attorney, prosecutor or court of law that you
make it as easy and idiot proof as humanly possible for the parties that receive your video to view it, otherwise your matter will never get the attention or result you are hoping for.
Many dash cam owners focus primarily on viewing their videos on their home computers but it is important to remember that we are really making videos that, at the end of the day, are evidence really intended for viewing by others as a result of a legal matter such as a serious motor vehicle accident. In many instances, you could be required to provide an unaltered copy of your
original video, especially in a serious matter such as a lawsuit that might involve serious injury or a fatality.
While H.265 is slowly making the transition to becoming the next de facto standard, it is simply not there yet.
For this reason, H.265 should be avoided at all costs!