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How does the VLC player calculate the total length of the timeline of the fmp4 file?

use VLC player to play fmp4 file, the player shows the total length of the timeline port is 0, but video can play normally.How does the player calculate the total length of the timeline of the fmp4 file? How should I modify the time parameter of fmp4 box. enter image description here

Solution

  • You have to add a Movie Fragment Random Access Box ('mfra') with the correct 'tfra' and 'mfro' to the end of your file. 'mfra' is essentially and index of all fragments. The 'tfra' boxes contain the presentation times for each fragment.

    It worked for me: enter image description here