Low FPS playback and no hardware acceleration option

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Its graphics chipset is GM965/GL960

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Yes I agree that HW is old, but at the same time what I am trying to play is just HD content and decoding a HD stream should not be a a big issue.

So which part of "old hardware" is still unclear to you? LibreELEC has no magic wand to make your prehistoric computer suddenly run twice as fast.

If you want better video handling, get your wallet out and buy something more contemporary. A Raspberry Pi 4 will run circles around your 7-8 yr old machine. You can probably pick up 2nd hand RPi3B+ now for half the money.

To answer the original Q more directly. During playback press the 'o' key and it will show you whether FFmeg hardware or (SW) softtware decoding is being used. Older Intel low-end GMA chipsets are not always so well supported, they pre-date the point where Intel got properly interested in Linux and started to invest effort in support (in the newer hardware that followed). You might find that Windows is a better option.

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Are you saying that this machine does not have a hardware decoder to decode these streams? Mate, I my self is an engineer and I have built hardware decoders on FPGA's even.

Mm.. Here we go. Intel GM965 is about 11-12 years old. That is a lifetime in computer terms. All your video processing will be done by the CPU as the GPU has no modern hw acceleration of any kind, hence the "ff-h264(SW)" indicator in your Kodi OSD. As an "engineer" you should be open to that fact. By the way, it's "I myself AM an engineer".

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The problem seem to me that the linux during that time did not support its hardware decoder as no one was interested in writing a driver for that. Admit that its a problem with Linux rather than the machine. This machine can well decode an HD streams

I still have a Intel laptop with GM965 graphics (Intel Core2 Duo CPU T5470) myself, that currently runs Ubuntu Linux 16.04. It could be using a different driver setup than LibreELEC, but It can do 720p h.265/hevc videos comfortably (although the fan protests loudly these days). However, 1080p hevc will become a problem quickly all because again, as the video hardware was not designed for it.

H264 should be a much less problem for the laptop in your case. Where things go wrong I don't know. Judging from the shitload of "DEBUG: ffmpeg[7F74437FF700]:" entries in your log file, I'd say something is not correct with that video file. Perhaps it was poorly remuxed. Or perhaps LibreELEC doesn't like the DTS stream in the video, as it is also a decoding process. I'm not a video guru, but the kodi log file is not happy.

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And I have no reason to buy used RPI's I have enough money to buy them if I want. Pathetic attitude you have there.

Depending on the use case, there is no reason to buy new a RPi4 when a RPi3 can do the job perfectly as well. Software for the RPi3 has been developed over many years now, while the RPi4 still has some rough edges.

I'm glad that money for you is not an issue, but it isn't always the deciding factor. There are plenty of people out there wanting to buy "the best possible Kodi setup ever". There is no such thing, as there is always something that is hampering that "total experience". Be it hardware or the software (Kodi, drivers, whatever). For now, HDR support is one of those hurdles.

We see threads on the forums (LibreELEC and Kodi) where money can be an issue. We also don't have a crystal ball here to see what the living standard or what the technical know-how level of people on the forum is. But people being instantly offended by simply misreading a forum reply and yelling that they are "an engineer" themselves is enough for me to wish you luck with all your Kodi problems, I'll go about my own business from here on.