If you encountered "19717mp4" as a file name, it is likely a video using the MPEG-4 container that may have been tagged with a standard ID or generated by a specific system.
is an international standard titled "Plastics — Isoconversional kinetic analysis of chemical reactions and phase transitions" . 19717mp4
: Standard MP4 files typically use H.264 video and AAC audio codecs for maximum device compatibility. MP4 file format - ISO/IEC 14496-14:2003 If you encountered "19717mp4" as a file name,
Used in or Thermogravimetry (TG) measurements. MP4 file format - ISO/IEC 14496-14:2003 Used in
Predicts kinetic behavior in temperature regions that are not experimentally accessible. Relation to MP4 (MPEG-4 Part 17)
Determines activation energy as a function of reaction conversion.
The "mp4" suffix in your query may refer to (ISO/IEC 14496-17:2006), often abbreviated in technical discussions as MP4TT (MPEG-4 Timed Text).