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Sur d’autres sites (14403)

  • Multiple fadeIn/fadeOut effects in one audio file with ffmpeg

    22 janvier 2017, par farw

    I have some problem to add several fade effects to one audio file. When I try to use a command like this :

    ffmpeg -y -i /home/user/video/test/sound.mp3 -af "afade=t=in:ss=0:d=3,afade=t=out:st=7:d=3,afade=t=in:st=10:d=3,afade=t=out:st=17:d=3,afade=t=in:st=20:d=3,afade=t=out:st=27:d=3" /tmp/test.mp3

    then my output audio file has a fadein and fadeout applied only once. All the next effects don’t get applied. Is there any possible way to apply several fade effects to the same audio file ? Also, what is the difference between ss and st parameter in this command ?

  • How to manipulate YUV frames obtained from an ffmpeg video decoder ?

    23 juillet 2014, par user3665376

    I wanted to apply effects on video while rendering on android . I decoded the mpeg4 video using ffmpeg to raw YUV(YUV420P) frames .

    I modified the Y(luminescence) bytes using the below snippet and rendered it to screen after converting it to RGB frames .

    AVFrame *frame = [YUV420P frame recieved from ffmpeg decoder]
    
uint8_t *tempPtr = NULL;
    
tempPtr = frame->data[0];
    
int j;
    
for(j = 0 ; j < frame->linesize[0] ; j++){
    
    *(tempPtr++) = 1;
    
}

    I applied a Y value of 1 to all pixels of all frames . I expected an output video of low luminescence ie.much darker video . But I was not able to notice any change in luma of the rendered video .

    Note : The YCbCr data planes at AVFRame.data[0] , AVFrame.data[1] , Avframe.data[2] of the decoded frame has expected values . The AVFrame.buf pointers were all pointing to NULL (Don’t know whether it has anything to do with data).

    Wanted to know whether anybody has encountered this situation before ??Links to related opics also will be very much helpful.

    Thanks.

  • Revision a4dfcd9a2d : Implementing transform overlapping multiple blocks We removed the restriction t

    12 août 2014, par Yue Chen

    Changed Paths :
     Modify /configure


     Modify /vp9/common/vp9_blockd.h


     Modify /vp9/common/vp9_common_data.c


     Modify /vp9/common/vp9_common_data.h


     Modify /vp9/common/vp9_entropymode.c


     Modify /vp9/common/vp9_entropymode.h


     Modify /vp9/common/vp9_loopfilter.c


     Modify /vp9/common/vp9_reconinter.c


     Modify /vp9/common/vp9_reconinter.h


     Modify /vp9/decoder/vp9_decodeframe.c


     Modify /vp9/decoder/vp9_decodemv.c


     Modify /vp9/decoder/vp9_decodemv.h


     Modify /vp9/encoder/vp9_bitstream.c


     Modify /vp9/encoder/vp9_encodeframe.c


     Modify /vp9/encoder/vp9_encodemb.c


     Modify /vp9/encoder/vp9_encodemb.h


     Modify /vp9/encoder/vp9_rdopt.c


     Modify /vp9/encoder/vp9_rdopt.h


     Modify /vp9/encoder/vp9_tokenize.c


     Modify /vp9/encoder/vp9_tokenize.h



    Implementing transform overlapping multiple blocks

    We removed the restriction that transform blocks could not exceed
    the size of prediction blocks. Smoothing masks are applied to reduce
    discontinuity between prediction blocks in order to realize the
    efficiency of large transform.
    0.997%/0.895% bit-rate reduction is achieved on derf/stdhd set.

    Change-Id : I8db241bab9fe74d864809e95f76b771ee59a2def

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