MPEG-4 Part 14 (short: MP4) is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, but it can also hold other data such as subtitles and still images.

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Can't play currently recorded mp4 videos on my android phone

I have a gopro camera which records MP4 videos. My android phone was always capable of playing these files; but recently I have recorded two videos and my phone just says I do not support this type of ...