rgd1101 :
and what are these things? file type? video encoding?
try vlc player?
VLC is a media player.
It does other things, but it's main use is for video playback.
There are different types of video, specifically there are three main components to video:
a) video codec (requiring the correct video DECODER), and
b) audio codec (requiring the correct audio decoder), and
c) the file CONTAINER (the "glue" holding the video, audio, subtitles etc together)
For example, there may be a video that comprises:
H264 (video codec)
AC3 (audio codec)
MKV (container)
It sounds complicated but for the most part you can probably just install VLC then open your video and it should play.
*If the video is not ASSOCIATED with VLC it won't auto launch with VLC if you double-click it (or however Apple launches files). You'll have to figure out how to associate your files though it should give you an OPTION to associate with most applicable file types during installation.
Other
- encoding is for CREATING video or converting video from one codec type to another.
- modern GPU's can decode the main video file types via hardware (hardware acceleration) which saves on CPU cycles. It doesn't matter that much anymore with CPU's being pretty powerful but you can assign hardware acceleration to usually these:
H.264 (AVC)
MPEG2
VC1
- there's also a great tool called HANDBRAKE which converts one type of video to another. Remember, if it's for playback on another device it may not support some types of codec (such as H.265 aka HEVC). Even then codecs change over time so H.264 v4.2 may be supported for playback but no v5.2
I usually encode into H.264 (version 4.2), AC3, MKV.
https
/handbrake.fr/