x264 is an open-source codec that creates H.264 files.

(And H.264 is the same as AVC.)

@NickHope So there is no diffrence when working in Vegas Pro?

Because according to the information in the following link, it says "if you want to edit the recorded video with Sony Vegas, Adobe Premiere with the AVI container, you must choose the "X264" option" it seems like there is a difference between H264 and X264 when editing in Vegas! I am confused!

https://www.bandicam.com/support/tips/h264-fourcc/

x264 is a free and open-source software library and a command-line utility developed by VideoLAN for encoding video streams into the H.264/MPEG-4 AVC format.[1] It is released under the terms of the GNU General Public License.[1]

https://www.google.com/url?q=https://en.m.wikipedia.org/wiki/X264&sa=U&ved=2ahUKEwj6ua7qi9rpAhVKAp0JHSBUAcYQFjAAegQICBAB&usg=AOvVaw3KOPEfBu6I3c3n8QpAlUUa

x264 can render H.264 files.

Nvenc can render H.264 files.

Intel QSV can render H.264 files.

Mainconcept can render H.264 files.

@Musicvid @lan-mLMC  Thanks guys, but it's still not clear to me why would Bandicam recommend using x264 instead of H.264 when editing with Vegas!!

@Musicvid @lan-mLMC  Thanks guys, but it's still not clear to me why would Bandicam recommend using x264 instead of H.264 when editing with Vegas!!

Maybe Bandicam have some chaos. If you aren't clear, you can regard x264 and H.264 as same things.

Many hardware screen capture programs catpure in variable frame rate. That is not ideal for video editing. with bandicam it looks like it uses x.264 for software encoding and h.264 for hardware encoding. So they could have said for video editing use software encoding and not hardware encoding

If you do want to use hardware encoding, OBS allows constant frame rate, but many others such as Shadowplay and (from the sounds of it) Bandicam only do Variable frame rate for hardware encode

H.264/AVC is conventionally wrapped in MP4, MOV and MKV containers. I think Bandicam is putting it into an AVI container. I can't remember the reason. It might be to do with licensing. But it's unconventional. The sentence you refer to is talking about the FourCC Code, which is a piece of metadata. So I think it's saying that if you want playback compatibility, choose "H264", and if you want editing compatibility, choose "X264". I guess the actual encoding would otherwise be the same.

I have an old Bandicam AVI file here that I saved from an old forum post. It won't open in VEGAS. There lots of forum history of Bandicam problems with VEGAS.

You might consider using OBS Studio or another program instead. Recommended settings for OBS are here.