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  • FFMPEG libav : Control when video frame is captured

    24 mai 2019, par Michael Murray

    I am using a the libav library to record video from a CSI camera on a raspberry pi. I can successfully record the camera data to a file, however I now want to synchronise the frames between two cameras. I’ve setup a mechanism to synchronise when frames are captured, however I assumed when I called av_read_frame(input_format_context, &packet), that the next frame would be captured. However, it turns out that the video is streamed into some buffer, and when the buffer is full, it waits until the av_read_frame method is called which removes data from the buffer, thus allowing another frame to be captured.

    This is not the behaviour I want, as I need to control exactly when the frame is captured. Is there a mechanism in libav that I could use to produce this kind of behaviour ? Or am I going to have to use a different library for capturing video from the CSI device ?

  • Revision f43c3199bd : Rate control parameter adjustment Adjusts the bits per mb parameter about 10% s

    5 octobre 2013, par Deb Mukherjee

    Changed Paths :
     Modify /vp9/encoder/vp9_ratectrl.c



    Rate control parameter adjustment

    Adjusts the bits per mb parameter about 10% smaller.

    Results at speed 0 :
    fullderfraw : +0.255%
    fullstdhdraw : +0.262%
    stdhdraw250 : +0.291%

    Change-Id : I2b7317ac3f61737bc77eb5470aad870cade83fa5

  • Revision f752da8ce2 : Change to update of rate control factors. Remove damping parameter and use the

    27 janvier 2015, par Paul Wilkins

    Changed Paths :
     Modify /vp9/encoder/vp9_encoder.c


     Modify /vp9/encoder/vp9_ratectrl.c


     Modify /vp9/encoder/vp9_ratectrl.h



    Change to update of rate control factors.

    Remove damping parameter and use the damping
    formula introduced by Yaowu Xu in all cases.

    Change-Id : I18db7e0d0f262d5140102f259ab07821d374d285

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