If the Tamil audio doesn't match the lip movements, players like VLC allow you to fix this on the fly. Press the J or K keys to shift audio backward or forward in 50ms increments.
The most reliable choice for MKV files. It handles Tamil audio tracks and HEVC decoding natively. You can download it for any platform at videolan.org . If the Tamil audio doesn't match the lip
If the file fails to play on certain smart TVs, you may need to "remux" it using MKVMerge to ensure the tracks are ordered correctly for your specific player. MKV Files Explained - Adobe If the Tamil audio doesn't match the lip