Sorry, Dave. For faster transmission, a video, as well as other types of data, is first compressed (encoded), then, when you play it, the player, browser, etc., decompresses (decodes) it so you can view it. Hence, the term CO(compress)DEC(decompress).
The msg just means your browser doesnât support the codec needed to play this video. You can try another browser, or you can download it and play it in a media player, like VLC
If you donât have VLC, you can go to vlc.com and download and install the Android version.