MP4 module

[yan.sheng.upai.com@…]

#curl ​http://127.0.0.1:80/test.mp4?start=10

if start=10 is not the site of keyframe, the mp4 may have abnormal such as no picture before N second,or screen blurred.

I think the solution is to add the following step：
(1)stts：forcast the nearest sample on the basis of start=X
(2)stss：find the nearest keyframe sample on the basis of step (1)
(3)stts：find the nearest start arg on the basis of step (2)
...

[Maxim Dounin]

This is expected behaviour. The mp4 module do not try to search for and/or introduce additional key frames, it expects a player to do requests to appropriate key frames instead.