If the file playback speed exceeds the normal speed, it means that the file index is abnormal, which may lead to abnormal parsing of mp4 files by TV, thus leading to overspeed playback.
If it's still at normal speed, but faster than your handheld device, it means that your handheld device configuration is relatively low and you can't play this file smoothly, but the chip built in the TV has high processing speed and can play it smoothly.