[FFmpeg-user] How to apply effects to a frame decoded using ffmpeg?

[David Varghese]

Thank you very much . You resolved my blunder , I'm more clear about the
AVFrame structure now.

One last question: Is there any significant advantage in using the prebuild
filters of ffmpeg over manipulating YUV frames by iterating through it?





On Wed, Jul 23, 2014 at 7:26 PM, James Darnley <james.darnley at gmail.com>
wrote:

> On 2014-07-23 15:39, David Varghese wrote:
> > Thanks for the reply.
> >
> > Infact I tried to directly manipulate the YUV frame that I got from
> decoder
> > . I tried to modify the Y value of every pixels of every frames to 1 ,
> > expecting to see a much darker video . But I didnt found any changes in
> the
> > video .
> >
> > The code snippet is as below,
> >
> > 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;}
> >
> > Am I doing something seriously wrong?
>
> You are only processing one line there.  You need to be iterating over
> the height too.
>
>
>
>
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>


-- 
Thanks and Regards ,
David Varghese