Mario, HEVC and VP9 are not lossless...

F Thomsen, well.... yes....
but a normal mortal wouldn't be able to tell the difference!
If you can, seeing the film on your TV, you probably have .... hummmm.... microscopic eyes.
So, basically, if one's seeing at least HD versions of films it is quite hard to see the difference.
Heck, I can't even notice a REAL difference between 720p and 1080p on my big 4K TV.

mario

Mario, it should be obvious displaying 720p on a 2160p (4K TV) since the pixels have to be significantly interpolated as 2160 cannot be directly divided by 720 but it can by 1080... if you cannot see the difference look closer and or see an optometrist.

IF you ever get the chance to see a lossly encoded master video file on your large 4K TV you will realise (assuming you are not prtially sighted) that even the best lossy codecs have degraded the colour resolution so significantly that converting whatever video source files you have to HEVC or any other modern codec that the video had already been stripped of so much infomation by the first lossy codec used albeit bluray or H264 in your cam corder or MPG2 in your Video-DVD that there's not much detail anyway. Consumers never see losslessly encoded video unless they compose it themselves in a video editor. I am not aware of any consumer grade video camera that includes lossless video encoding yet, which would be needed if we want to compose true HDR UHD life shot video compositions. Maybe when 2TB or more SSD chips fit into SD cards someone might consider it viable to produce lossless encoded video cameras but for now the storage is not compact enough or cheap enough to warrant a camera with that capability.

TK, oops I wrote "IF you ever get the chance to see a lossly encoded master video file on your large 4K TV you will realise "...
that was supposed to be "losslessly encoded" My fingers went on strike during the extra "less" letters ;-)

linas peckus,

It could be this converter, possibly because of its age -- see TK's comment -- or there might be something odd about the video you recorded with your phone. I didn't see anything specific with a very quick Google, though I did find a tip to turn off High Efficiency Video for better compatibility.

android.gadgethacks[.]com/how-to/13-tips-for-recording-better-videos-your-galaxy-0195940/

linas peckus, you'd need to determine what the S10 4k videos video codec was and then open a command line in the program installation folder and type in the command prompt:

FactoryConvertor -codecs | more

and hit return. Then look to see if the source videos codec is included in the list and if it is that D flag is showing in the capability codes for it. (FactoryConvertor.exe is FFMPEG.EXE renamed for some obscure reason known only to the copyright infringer that took the software but declined to honour the terms of FFMPEG projects copyright.).

linas peckus, You just miss the H265 Video codec. Then you have sound but no image.

rww, Only audio came out after conversion, i didn't choose audio only. there is no option for that

TK, thanks for your observations

Gary, thanks! Definitely worth a read of those comments. Interesting that the first (and irrelevant) post on that giveaway was the same as the first (and still irrelevant) comment on this post about subtitles. Hmmm....

Gary, Astounding how few the number of comments remaining in that previous giveaway... I guess the comments on it were heavily sanitised while no one was looking!

NottaRobot, irrelevant for you not for others

taha, it’s a converter not an editor.

Sarah, subtitles are a data stream in some video files like any other data stream... xmedia recode is another converter and it lets you add subtitle files to a video and have the subtitles included in the conversion as subtitle data stream that can be enabled or not enabled in the player. One output video formats that support embeded subtitle or closed caption streams. taha did not mean manually editing and rendering subtitles on a video in an editor, that would be very time consuming and end up with hard coded subtitles and not a subtitle data stream that can be shown or not at the time it it's being watched.

taha, TK precisely explained subtitles. Summarizing, basically there are two ways to "add" subtitles to your films : the so called "hard coded" - these are like you have recorded a TV foreign movie that is presenting the subtitles on your TV screen. When you see it latter, the subtitles are there on the film; they have become part of the film and there is no way to take them out. You cannot change their color, size, position on screen etc.
And there are the ones called "soft coded". These ones stay on another file with exactly the same name of the movie file - for example - your movie file is called "movie.mp4", the subtitles will be called "movie.srt". The .srt termination designates one type of subtitles, my favorite, which is a simple text file. But it depends on your reproducing equipment which might or not accept this type ( I think that most probably all equipments accept srt subtitles files). Other types are sub/idx, ass, ssa. So, with an external subtitle, and depending of your equipment, you can manipulate how they will be presented on screen - their position on top or bottom, on the very very bottom or a little bit higher, change their color, make them bigger or smaller, bold or not and probably some other configuration that I'm forgetting. My TV gives me all these possibilities.
So I NEVER hard code subtitles, because once they are on film nothing else can be done, even if you find out later that the translation of the original language is totally wrong, when your Brazilian friend comes in and you proudly show him the Brazilian movie you just found and he tells you that the translation is wrong and that it completelly changes the meaning of the picture.