Since the TEAC MP-400 player supports MP4 video files, we tried to encode some of our own clips to the MP4 format using Nero Digital. We tried all possible encoding profiles, but unfortunately, Nero's MP4 format is not supported. We also tried several other programs with the appropriate MP4 codecs installed, but again, we could not create an appropriate file to play on the MP-400. Of course, TEAC provides a very simple to use video converter on the installation disc and we used it to convert some files to a supported MP4 format. Only the MP4 files that we created with TEAC's converter could be played on the player.

When used as a photo viewer, only JPEG files could be shown on the LCD screen. No other file type is supported. A good thing to remember is that the MP-400 can open practically any JPEG file. We tried small sized files (4~10kb ) but also huge files (50~60MB). All JPEG files could be shown on the LCD screen, but large files took ages to open.

The following table shows the audio formats that we tested with the MP-400 player.

As you can see, there is a wide range of formats that can be played with the TEAC MP-400 player.

TEAC suggests that it will take approximately 14 hours to discharge a full charged battery. It took us 20 hours of mp3 playback to fully drain the battery or 8 hours of MP4 video playback. We didn't even try to test how much time a fully charged battery will take to drain with the radio, since we imagine it will take days (if not weeks). In other words, excellent battery life and low power consumption .