All properties are gone for newly converted video

[terribleProgrammer]

I've converted one of my movies from .mkv to .mp4. I used MKVToolNix for lossless conversion, and the end result looks great, but the file is missing all of its properties. I can no longer go into the "properties" tab and see its resolution, framerate, etc. The thumbnail (the image that is shown as the file icon) is also gone. Is there any software to detect these things and set them automatically, or a way to do it myself?

Another question: I'm converting to .mp4 for compatibility reasons. Will simply repackaging the video and audio streams into the mp4 container help video players that could not play the original .mkv?

[sneaker]

I've converted one of my movies from .mkv to .mp4. I used MKVToolNix for lossless conversion

MKVToolNix cannot convert mkv to mp4, only mp4 to mkv. You can try BOX4, ffmpeg etc.

Another question: I'm converting to .mp4 for compatibility reasons. Will simply repackaging the video and audio streams into the mp4 container help video players that could not play the original .mkv?

Sometimes, not always. Depends on the file (mp4 and mkv are just containers, they can hold lots of different types of streams, metadata and also muxing characteristics aren't always the same) and your player.

[LigH.de]

In addition, the range of supported content formats is very wide for the MKV container, but rather narrow for the MP4 container.

[Drix]

Try this, it might solve your problem - http://www.freemake.com/free_video_converter/

[LigH.de]

Aww, nooo - pseudo freeware with ads. There is so much real freeware without.

[terribleProgrammer]

MKVToolNix cannot convert mkv to mp4, only mp4 to mkv. You can try BOX4, ffmpeg etc.

It seems you were correct. I was able to convert using ffmpeg. The file thumbnail is still missing, but I realize that this is a problem with my operating system, not the software I use to convert. Now at least the other properties are there.

Thanks to everyone who replied.