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Sur d’autres sites (13858)

  • FFmpeg change resolution

    15 mars 2012, par Iva

    I have changed resolution video using next code :

    pFrameOut = avcodec_alloc_frame();
    
avpicture_fill((AVPicture *)pFrameOut, video_outbuf, PIX_FMT_YUV420P, video_width_out, video_height_out );          
    
avcodec_decode_video2( pCodecCtx, pFrame, &frameFinished, &packet );                 
    
if(frameFinished)  // Did we get a video frame?
    
{
    

    
    static struct SwsContext *img_convert_ctx_in = NULL;
    
    if (img_convert_ctx_in == NULL)
    
    {
    
        img_convert_ctx_in =sws_getContext( pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,video_width_out, video_height_out, PIX_FMT_YUV420P, SWS_BICUBIC,NULL, NULL, NULL );             
    
        if (img_convert_ctx_in == NULL)
    
        {
    
            LOGI(10,"naInitFile::Could no create Software Scale Context");
    
            return ;
    
        }
    
    }
    

    
    retval = sws_scale(img_convert_ctx_in, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameOut->data, pFrameOut->linesize);
    
    SaveVideoFrame();
    
}//end  if(frameFinished)  

    But after that time of play increased twofold. Why it could happen ?

  • Change resolution of a video using FFmpeg

    10 septembre 2013, par Gonzalo Solera

    I need to decrease the resolution of a file programatically in Android, but there isn´t any class to do that. So I found that I could do it using FFmpeg with this code :

    ffmpeg -y -i /sdcard/in.mp4 -vf transpose=3 -s 320x240 -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/out.mp4

    How could I execute this code in my app ?? I know there are a version of FFmpeg adapted to Android but I don´t know anything about native code in Android.

    Thanks for help !!

  • Decrease video resolution

    9 septembre 2013, par Gonzalo Solera

    I need to change programmatically the resolution of diferent video files. I want to decrease them so I suppose it wouldn´t be a problem.
    I need to decrease the video resolutions from higher resolutions to 480.

    I think I could use FFmpeg to do that (using the android version ffmpeg4android) but I´m not sure it will work so I´m waiting for alternatives or a confirmation.

    Thanks for help !!

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