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  • How to improve random access of a video frame with Python ?

    11 octobre 2024, par Paul Jurczak

    I'm using pims library (https://github.com/soft-matter/pims) to access frames from .MOV file with over 25K frames, 3840 × 2160, H.264 (High Profile), 60fps.

    


    import pims
from time import perf_counter

video = pims.Video('video/v1.MOV')
t0 = perf_counter()
img = video[1000]
t1 = perf_counter()
print(f'{(t1-t0):.3f}s  {img.shape}')


    


    Here are the timings on a fairly fast PC, after file open :

    


      

    • frame #100 : 2.97s

      • 


    • frame #1,000 : 28.39s

      • 


    • frame #10,000 : 280.19s

      • 


    


    AFAIK, this library uses ffmpeg, which can access frame #10,000 with ffmpeg -ss 00:02:46.66 -i v1.MOV -frames:v 1 f10k.png practically instantaneously. Is there a way to improve frame access with pims or some other method ?

    


  • Revision cd4bac3004 : Prevent access to invalid pointer The commit added check to make sure no invali

    15 octobre 2013, par Yaowu Xu

    Changed Paths :
     Modify /vp9/vp9_dx_iface.c



    Prevent access to invalid pointer

    The commit added check to make sure no invalid memory access even when
    the decoder instance is never initialized.

    Change-Id : I4da343d0b3c78c27777ac7f5ce7688562c69f0c5

  • Revision ff1083c113 : Prevent access to invalid pointer The commit added check to make sure no invali

    15 octobre 2013, par Yaowu Xu

    Changed Paths :
     Modify /vp9/vp9_dx_iface.c



    Prevent access to invalid pointer

    The commit added check to make sure no invalid memory access even when
    the decoder instance is never initialized.

    Change-Id : I4da343d0b3c78c27777ac7f5ce7688562c69f0c5

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