MP4, AVI, MOV, FLV...etc...etc are container formats.  Think of them as specialty file systems that hold the various "files" that make up of the video.  Those parts can include the video, the audio, subtitles, thumbnail images, meta data... etc...etc.. and often time multiple versions of any combination of those.

The various containers can usually hold a number of different types of video formats inside them such as h.264, h.264/HEVC, MPEG4, Theora, VP8, VP9, AV1.  Then there are different audio formats and they can usually use just about anything you can think of as an audio codec, such as MP2, WAV but often times they use formats that you don't usually see outside of a video pairing like AC3, AAC, but there's no reason you couldn't just have an stand alone audio file in any format that can be encoded into a video.

So just looking at the suffix of the video file won't tell you anything about if your computer can play it back or not.  What you really need to know is the CODECS that make up various parts of the video are and the resolution that the video is stored at.   Your computer will have an easier time of with some video formats than others.  You'll find that your computer will usually have an easier time with older video formats that are much larger because the hardware decompressing support for that format is baked into the GPU or the CPU, so you'll find that putting a newer generation video card into even an old computer can make it instantly be able to play back the most modern 4K video simply because all the decompressing is happening on the GPU and the CPU has little to do with it.

If you have VLC, you can go to "Tools -> Codec Information" and "Tools -> Media Information" and it will give you a rough breakdown of what makes up your particular video.
Another really nice tool is mediainfo ( apt install mediainfo ).  Just run that with your video file name as the argument and it will spit out info about all the various parts that make up your video (or audio) file.

Brian Cluff
PS
My personal favorite container format is MKV since it seems to be able to hold just about anything you throw at it without limitation.


On 4/7/22 08:46, Michael via PLUG-discuss wrote:
about converting it to x264..... is this going to be an mp4 file?

On Thu, Apr 7, 2022 at 10:53 AM Bob Elzer via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
ok now try  

ffmpeg -i input.mp4 -codec:v libtheora -qscale:v 3 -codec:a libvorbis  -qscale:a 3 -f ogv output.ogg


you might also want to try converting it to x264   just google convert video to ffmpeg x264

On Wed, Apr 6, 2022 at 4:22 PM Michael via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
forgot to mention the ones that would not load

On Wed, Apr 6, 2022 at 7:19 PM Michael <bmike1@gmail.com> wrote:
I meant 1080 not 1099.

On Wed, Apr 6, 2022 at 7:16 PM Michael <bmike1@gmail.com> wrote:
I did. Those ones stuttered. The other ones had 2 hour downloads. The 1099 ogg file stuttered.

On Wed, Apr 6, 2022 at 7:10 PM Bob Elzer via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
I would try the mp4 versions too


On Wed, Apr 6, 2022, 3:07 PM Michael via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
After further investigation I found 720p_stereo.ogg and 480p_stereo.ogg work. So I need to convert it to one of those formats.
 
I assume you want me to convert it to 720.
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