Even if the file says .mp4 , the internal video might be encoded with a codec like VP9 or a high-profile 10-bit HDR that older WebOS versions cannot handle.
Some LG models (like the C1) have historically had trouble playing Dolby Vision content in MKV containers, but usually handle them well in MP4 formats . 3. Optimized Viewing Solutions SEEGASM_73S-A-lg.mp4
If the TV's internal player is struggling with the file, consider these superior alternatives: Even if the file says