38770mp4 -

: Support for embedded subtitles, still images, and object descriptions as defined by the MPEG-4 Part 14 standard .

If you are looking to develop a feature centered around an MP4 file with this ID, standard capabilities would include: 38770mp4

: Compatibility with online players and mobile platforms for immediate playback without full downloads. : Support for embedded subtitles, still images, and

However, based on its components, it likely refers to one of the following: : Support for embedded subtitles