For MP4 containers, use AAC , MP3 , or Dolby Digital .

If you plug in your USB and see an error, check these three critical areas:

If the TV's internal player is struggling with the file, consider these superior alternatives:

often have broader codec support than the native WebOS player.

For the best results with high-end demo files like , aim for these target specs: File Extension: .mp4 Video Codec: HEVC / H.265 Max Bitrate: Under 50 Mbps for standard USB playback. Color Space: BT.2020 for HDR10/Dolby Vision.

Most modern LG 4K sets (like the LG NanoCell series) support 4K H.264 at up to 60fps and 4K/8K HEVC at 60fps. If your file exceeds these bitrates, it may stutter or fail to load. 2. Troubleshooting Common "Invalid File" Errors