
With it, you don't need to know what is the codec in the MP4 format that'll be best for your LG TV.

If you are seeking for the best video output quality, fastest video conversion speed, and the most formats supported, iFastime Video Converter Ultimate for Mac will be your best choice. There are many third-party tools out there that allow you to convert and transcode these MP4 contents for use them with your LG TV through USB. But to make everything easy, one recommended solution is to convert MP4 to LG TV compatible format like Divx, MP4 etc. If that doesn't help use MediaInfo to compare the video/audio formats inside the container with some file that works. To solve cannot play MP4 on LG TV, you can try renaming the files to see if it helps.
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How to Solve LG TV Won't Play MP4 through USB? In other words, if you transfer MP4 with other types of codecs to LG TV through USB, you will fail to play MP4 to LG TV. What we should pay attention to is that mp4 is a media container format which can be encoded with many different codecs, like divx, xvid, h265, h264, h263, avc, mpeg-4, etc, however, LG TV only supports MP4 with special codecs, and the best format for LG TV is H.264/AVC codec MP4 video (For LG 4K TV is H.265/HEVC codec). Your guesses are right! LG TV is refusing to play an MP4 file because of the unsupported codec. Have a pile of amazing MP4 files to play on widescreen LG TV? But strangely, some MP4 files work and some just don't seem to be playable on LG TV from USB.
