nodiscc
commented
6 years ago I need to convert them with ffmpeg or other converters but problem it that it modify date
Have a look at the ffmpeg documentation https://ffmpeg.org/ffmpeg.html and https://ffmpeg.org/ffmpeg.html#toc-See-Also, or there are graphical interfaces for ffmpeg https://qwinff.github.io/ that may do what you need. But you probably need to write a custom ffmpeg command-line.
As it's an ffmpeg question and not a youtube-dlg question we can not help you much. Good luck.
MrS0m30n3
Thanks for awesome gui both of you! If I set default, it download max resolution of yotuube files and those are .mkv file. I like youtube-dl for the feature it don't modify meta data of date, I can't fine on other downloaders. Now, I need to convert mkv to mp4, cause opus plugin not supported on vegus pro, so I need to convert them with ffmpeg or other converters. but problem it that it modify date, may be i put wrong section, any thing to converter option that don't modify date and keep original date of files. sorry for weak english.