mp4_module doubt

[liubin]

Hello：
	I have a question with ngx_http_mp4_module.
	As i know,ngx_http_mp4_module compute  start_module using stts.
	For example，we get start_sample=3 from the stts.
	However,the stss is 1,5,9.
	Then,why don’t make start_sample=5?
	Can 3 display nomally while there is no 1 as sync sample?
Best regards,
-yurnero

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