fix: failed to execute start on TimeRanges

[xiaoyuhen]

fix: failed to execute start on TimeRanges

Description

Use buffered .start when buffered.length is not empty

• Fix: Failed to execute 'start' on 'TimeRanges': The index provided (0) is greater than or equal to the maximum bound (0)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[codecov-io]

Codecov Report

Merging #71 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master     #71      +/-   ##
=========================================
- Coverage   51.53%   51.5%   -0.03%     
=========================================
  Files         123     123              
  Lines        1721    1722       +1     
=========================================
  Hits          887     887              
- Misses        834     835       +1

Impacted Files	Coverage Δ
packages/griffith-mp4/src/player.js	0% <0%> (ø)	⬆️
packages/griffith-mp4/src/mse/controller.js	0% <0%> (ø)	⬆️

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