I’ll explain you how to compile x264 with l-smash to have mp4 video on linux system (eg: Fedora).

It’s easy:

Install l-smash

• install git
• do git clone https://github.com/l-smash/l-smash.git
• cd l-smash
• ./configure --prefix='/usr' --enable-shared --disable-static
• make
• sudo make install

Compile x264

• do git clone git://git.videolan.org/git/x264.git
• cd x264
• ./configure --prefix='/usr' --enable-shared --enable-pic --enable-lto
• here check that you have the line mp4: lsmash
• and then build it: make

In case you want to use x264 with l-smash, choose the x264 file from the folder x264 build above!

Bonus: Blender

Blender is not build with ffmpeg on Fedora, so you can use the binarie from Blender themself, located here: https://www.blender.org/download/