Go back to the Telegram app and ensure the progress circle is finished.
It supports almost every codec and can often play files that appear "corrupted" or have Telegram-specific encoding issues. 5_6204072876023219776mp4
If the video won't open in your default player (like Windows Media Player or QuickTime): Go back to the Telegram app and ensure
To stop the file from getting lost in your "Telegram Video" folder: Right-click the file and select . 5_6204072876023219776mp4
Use (Free/Open Source) to re-encode the video into a "Constant Framerate" MP4. This usually fixes any sync or compatibility issues common with mobile-shared videos.
Telegram videos sometimes fail to play if they weren't downloaded completely.