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Autres articles (68)

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Sur d’autres sites (10391)

  • av_freep SIGSEGV in ffmpeg

    13 mars 2020, par Daniel

    In ffmpeg there is a function for freeing resources :

    void av_freep(void *arg)
    
{
    
    void *val;
    

    
    memcpy(&val, arg, sizeof(val));
    
    memcpy(arg, &(void *){ NULL }, sizeof(val));
    
    av_free(val);
    
}

    Now I’m getting a SIGSEGV in the first memcpy line.

    arg seems a valid pointer (at least it is not NULL).

    I’m calling this as av_freep(&mOutputFormatCtx->pb);

    This pb was created by avio_alloc_context, however I’m calling av_freep after an RTSP stream source became invalid (camera turned off).

    How can I avoid this SIGSEGV ?
    Although arg’s address seems good, debugger tells me : "Cannot access memory at address 0xabcdef" if I try watching mOutputFormatCtx->pb.

  • Revision 74ded4863e : Enable conditional skip path in rd_pick_intra_sby_mode These speed-up features

    4 décembre 2014, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_rdopt.c


     Modify /vp9/encoder/vp9_speed_features.c



    Enable conditional skip path in rd_pick_intra_sby_mode

    These speed-up features for key frame coding are only turned on
    in the settings of hybrid non-RD and RD mode decision. It provides
    about 20% speed-up to the hybrid key frame coding at the expense
    of certain compression performance loss. For vidyo1, the key frame
    coding statistics are changed
    9838F, 35.020 dB, 61677 us -> 9920F, 34.834 dB, 47556 us

    Overall rtc set compression performance is down by -0.257%.

    Change-Id : I0025447fda26bb7855e982955642b5f55d71b51f

  • hwcontext_vulkan : forward debug_mode to check_extensions() for devices

    22 septembre 2024, par Lynne
    hwcontext_vulkan : forward debug_mode to check_extensions() for devices

    This allows disabling of certain extensions when debug mode is turned on.
    • [DH] libavutil/hwcontext_vulkan.c

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