Fixing USB Playback Issues for Video Files on LG, Samsung and other TVs - e.g. "Invalid File"

If your file won't play and the TV reports "Invalid file", the thumbnail is not created instead a one with a warning arrow, then your TV won't eat the file.

The problem is likely one of these issues:
1. unsupported format (check the supported list, e.g. LG)
- especially note the restriction of 30 fps for FullHD
- video codecs are usually divx and h264 (up to profile 4.1), no GMC
- audio codecs are usually mp3, ac3, aac.
2. Badly muxed file
3. Mkv with header compression
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