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Sync mult srt #744

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Sync mult srt #744

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Commits on Dec 3, 2020

  1. Add SRT restful API

    @qwu16 @daijh
    qwu16 authored and daijh committed Dec 3, 2020
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  2. Add sync timestamp in srt streaming input and vcm decoder

    @daijh
    daijh committed Dec 3, 2020
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  3. Optimize FFmpeg video decoder. Add sync timestamp

    @daijh
    daijh committed Dec 3, 2020
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  4. Create input frame queue in soft mixer

    @daijh
    daijh committed Dec 3, 2020
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  5. Implement multiple input sync 

    The sync feature is only enabled for SRT streaming input at this moment

Each SoftInput maintains a frame queue with max size 30. If the frame
queue is full, it means this input is out of sync too much. We disable
sync on this input, and fallback to non sync mode input.

Sync to latest frame
Example:
    frame-queue-1 [t3 t2 t1 t0]
    frame-queue-2 [t4 t3 t2 t1]
    frame-queue-3 [t5 t4 t3 t2]
    the common sync timestamp range is [t3 t2], and we will sync to t3
    @daijh
    daijh committed Dec 3, 2020
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