My fault. I didn't set correct pts and duration in AVPacket. Before
FFmpeg 2.5, it does not matter because AVPacket.data contains time
information.
"Dialogue: 0,0:00:20.21,0:00:22.96,*Default,NTP,0000,0000,0000,blablabla
I guess ass decoder use that information.
In 2.5, AVPacket.data does not have time information
16,0,*Default,NTP,0000,0000,0000,,blablabla
then I have to set AVPacket pts and duration.
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